@article { ISI:000225953600006, title = {In situ polymerization of ethylene with bis(imino)pyridine iron(II) catalysts supported on clay: the synthesis and characterization of polyethylene-clay nanocomposites}, journal = {Journal of Polymer Science Part A-Polymer Chemistry}, volume = {43}, number = {2}, year = {2005}, month = {JAN}, pages = {304-318}, publisher = {JOHN WILEY \& SONS INC}, type = {Article}, address = {111 RIVER ST, HOBOKEN, NJ 07030 USA}, abstract = {

Polyethylene-clay nanocomposites were synthesized by in situ polymerization with 2,6-bis[1-(2,6-diisopropylphenylimino)ethyl] pyridine iron(II) dichloride supported on a modified montmorillonite clay pretreated with methylaluminoxane (MAO). The catalysts and the obtained nanocomposites were examined with wide-angle X-ray scattering. The exfoliation of the clay was further established by transmission electron microscopy. Upon the treatment of the clay with MAO, there was an increase in the d-spacing of the clay galleries. No further increase in the d-spacing of the galleries was observed with the iron catalyst supported on the MAO-treated clay. The catalyst activity for ethylene polymerization was independent of the Al/Fe ratio. The exfoliation of the clay inside the polymer matrix depended on various parameters, such as the clay content, catalyst content, and Al/Fe ratio. The crystallinity percentage and crystallite size of the nanocomposites were affected by the degree of exfoliation of the clay. Moreover, when ethylene was polymerized with a mixture of the homogeneous iron(II) catalyst and clay, the degree of exfoliation was significantly lower than when the polymerization was performed with a preformed clay-supported catalyst. This observation suggested that in the supported catalyst, at least some of the active centers resided within the galleries of the clay. (C) 2004 Wiley Periodicals, Inc.

}, keywords = {clay, In situ polymerization, Nanocomposites, polyethylene (PE), TEM, WAXS}, issn = {0887-624X}, doi = {10.1002/pola.20502}, author = {Ray, S and Galgali, G and Lele, Arundhati C. and Sivaram, S} } @article { ISI:000239340200010, title = {Synthesis, characterization and optical properties of silver and gold nanowires embedded in mesoporous MCM-41}, journal = {Central European Journal of Chemistry}, volume = {4}, number = {2}, year = {2006}, month = {JUN}, pages = {317-328}, publisher = {SPRINGER HEIDELBERG}, type = {Article}, address = {TIERGARTENSTRASSE 17, D-69121 HEIDELBERG, GERMANY}, abstract = {

Uniform nanowires of silver and gold inside the channels of MCM-41 were prepared by controlled reduction of their respective metal salts with sodium borohydride (NaBH4). Presence of nanowires of silver and gold in MCM-41 were confirmed by high angle X-ray diffraction (XRD) data (peaks between 2 theta = 30 - 60 degrees) and transmission electron microscopy (TEM) confirmed the diameter of the nanowires. Diameter of nanowires is found to be similar to 2.8 nm which is coincident with channel diameter of MCM-41. Optical properties of these heterostructured materials Ag-MCM-41 and Au-MCM-41 reveals the presence of surface plasmon absorption peaks of silver and gold respectively, and the shift in the absorption bands are associated to agglomeration of clusters inside the channels. Room temperature photoluminescence spectra exhibits interesting optical properties as observed for direct band gap semiconductors. Non-linear optical properties (NLO) corresponding to second harmonic generation (SHG) values were also recorded for self supported films of these heterostructured materials. Enhanced optical non-linearity was found to be arising from a corresponding increase of local field near the surface plasmon resonance. Further enhancement in SHG was found with poling due to an induction of orientation order. (C) Versita Warsaw and Springer-Verlag Berlin Heidelberg. All rights reserved.

}, keywords = {Ag/Au nanowires, MCM-41, photoluminescence, SHG, TEM}, issn = {1895-1066}, doi = {10.2478/s11532-006-0006-4}, author = {Adhyapak, Parag V. and Karandikar, Prashant R. and Dadge, Jagdish W. and Aiyer, Rohini C. and Chandwadkar, Asha J.} } @article { ISI:000257271600057, title = {Bacterial synthesis of copper/copper oxide nanoparticles}, journal = {Journal of Nanoscience and Nanotechnology}, volume = {8}, number = {6}, year = {2008}, month = {JUN}, pages = {3191-3196}, publisher = {AMER SCIENTIFIC PUBLISHERS}, type = {Article}, address = {26650 THE OLD RD, STE 208, VALENCIA, CA 91381-0751 USA}, abstract = {

A bacterial mediated synthesis of copper/copper oxide nanoparticle composite is reported. A Gram-negative bacterium belonging to the genus Serratia was isolated from the midgut of Stibara sp., an insect of the Cerambycidae family of beetles found in the Northwestern Ghats of India. This is a unique bacterium that is quite specific for the synthesis of copper oxide nanoparticles as several other strains isolated from the same insect and common Indian mosquitoes did not result in nanoparticle formation. By following the reaction systematically, we could delineate that the nanoparticle formation occurs intracellularly. However, the process results in the killing of bacterial cells. Subsequently the nanoparticles leak out as the cell wall disintegrates. The nanoparticles formed are thoroughly characterized by UV-Vis, TEM, XRD, XPS and FTIR studies.

}, keywords = {bacterial synthesis, Nanoparticles, TEM, XPS, XRD}, issn = {1533-4880}, doi = {10.1166/jnn.2008.095}, author = {Hasan, Syed Saif and Singh, Sanjay and Parikh, Rasesh Y. and Dharne, Mahesh S. and Patole, Milind S. and Bhagavatula L. V. Prasad and Shouche, Yogesh S.} } @article { ISI:000288877700023, title = {Highly sensitive and selective LPG sensor based on alpha-Fe2O3 nanorods}, journal = {Sensors and Actuators B-Chemical}, volume = {152}, number = {2}, year = {2011}, month = {MAR}, pages = {299-306}, publisher = {ELSEVIER SCIENCE SA}, address = {PO BOX 564, 1001 LAUSANNE, SWITZERLAND}, abstract = {

The alpha-Fe2O3 nanorods were successfully synthesized without any templates by calcining the alpha-FeOOH precursor in air at 300 degrees C for 2 h and their LPG sensing characteristics were investigated. The alpha-FeOOH precursor was prepared through a simple and low cost wet chemical route at low temperature (40 degrees C) using FeSO4 center dot 7H(2)O and CH3COONa as starting materials. The formation of alpha-FeOOH precursor and its topotactic transformation to alpha-Fe2O3 upon calcination was confirmed by X-ray diffraction measurement (XRD). X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) analysis. The alpha-Fe2O3 nanorods exhibited outstanding gas sensing characteristics such as, higher gas response (similar to 1746-50 ppm LPG at 300 degrees C), extremely rapid response (similar to 3-4 s), relatively slow recovery (similar to 8-9 min), excellent repeatability, good selectivity and lower operating temperature (similar to 300 degrees C). Furthermore, the alpha-Fe2O3 nanorods are able to detect up to 5 ppm for LPG with reasonable response (similar to 15) at the operating temperature of 300 degrees C and they can be reliably used to monitor the concentration of LPG over the range (5-60 ppm). The experimental results clearly demonstrate the potential of using the alpha-Fe2O3 nanorods as sensing material in the fabrication of LPG sensors. Plausible LP G sensing mechanism of the alpha-Fe2O3 nanorods is also discussed. (C) 2010 Elsevier B.V. All rights reserved.

}, keywords = {alpha-Fe2O3 nanorods, FESEM, LPG sensor, Semiconductor gas sensors, TEM, XPS, XRD}, issn = {0925-4005}, doi = {10.1016/j.snb.2010.12.025}, author = {Patil, Dewyani and Patil, Virendra and Patil, Pradip} } @article { ISI:000288772300011, title = {Magnetic properties of thermal plasma synthesized nanocrystalline nickel ferrite (NiFe2O4)}, journal = {Journal of Alloys and Compounds}, volume = {509}, number = {12}, year = {2011}, month = {MAR}, pages = {4404-4413}, publisher = {ELSEVIER SCIENCE SA}, address = {PO BOX 564, 1001 LAUSANNE, SWITZERLAND}, abstract = {

A rapid synthesis method is reported for magnetic nanoparticles of nickel ferrite involving thermal plasma assisted vapor phase condensation process. The as-synthesized samples were characterized by X-ray Diffraction, Transmission Electron Microscopy, Vibrating Sample Magnetometer and X-ray Photoelectron Spectroscopy techniques. The average particle size was determined from the TEM micrographs and found to be around 30 nm. The effects of reactor parameters on the magnetic and structural properties have been evaluated, to find the optimized parameters so as to achieve the highest values of saturation magnetization and coercivity. Reasonably high saturation magnetization (48 emu/g) has been assigned to the high degree of crystallinity, achieved on account of high temperature during the growth, and the cation redistribution. The high value of coercivity (1150e) is explained on the basis of possible lattice defects arising from the cation redistribution. Detailed analysis of cation distribution using the XRD line intensity data leads to the conclusion that these samples are iron deficit and nickel rich. (C) 2011 Elsevier B.V. All rights reserved.

}, keywords = {crystal structure, Magnetic measurements, Magnetization, Nanostructured materials, TEM}, issn = {0925-8388}, doi = {10.1016/j.jallcom.2011.01.057}, author = {Nawale, Ashok B. and Kanhe, Nilesh S. and Patil, K. R. and Bhoraskar, S. V. and Mathe, Vikas L. and Das, A. K.} } @article { ISI:000288393700001, title = {Synthesis of gold nanoparticles by various leaf fractions of Semecarpus anacardium L. tree}, journal = {Trees-Structure and Function}, volume = {25}, number = {2}, year = {2011}, month = {APR}, pages = {145-151}, publisher = {SPRINGER HEIDELBERG}, address = {TIERGARTENSTRASSE 17, D-69121 HEIDELBERG, GERMANY}, abstract = {

Gold nanoparticles (NPs) were synthesized using Semecarpus anacardium leaf extracts in water and the green biomass. Extract prepared at ambient condition by crushing the leaves in deionized water is identified as {\textquoteleft}green extract{\textquoteright}, and that by boiling the leaf pieces as {\textquoteleft}boiled extract{\textquoteright}. The mass remaining after separating the {\textquoteleft}green extract{\textquoteright} is identified as {\textquoteleft}green biomass{\textquoteright}. These components triggered rapid reduction of Au(III) to Au (0) in HAuCl4 solution indicating the natural ability of the leaves of S. anacardium to synthesize NPs in ambient conditions. Green extract produced more NPs compared to the boiled extract suggesting denaturization of some of the useful factors due to boiling. NPs were quantified using UV and ICP-AES analysis. These were characterized using Transmission electron microscopy, Fourier transform infrared spectroscopy and X-ray diffraction. TEM images of the particles formed with green extract, boiled extract and green biomass showed that the particles were of different shapes and sizes.

}, keywords = {Biosynthesis, gold nanoparticles, Green extract, Semecarpus, TEM}, issn = {0931-1890}, doi = {10.1007/s00468-010-0493-y}, author = {Raju, D. and Mehta, Urmil J. and Hazra, Sulekha} } @article { ISI:000312542600011, title = {Phytosynthesis of intracellular and extracellular gold nanoparticles by living peanut plant (Arachis hypogaea L.)}, journal = {Biotechnology and Applied Biochemistry}, volume = {59}, number = {6}, year = {2012}, month = {NOV}, pages = {471-478}, publisher = {WILEY-BLACKWELL}, type = {Article}, address = {111 RIVER ST, HOBOKEN 07030-5774, NJ USA}, abstract = {

Inorganic nanomaterials of different chemical compositions are conventionally synthesized under harsh environments such as extremes of temperature, pressure, and pH. Moreover, these methods are eco-unfriendly and cumbersome, yield bigger particles, and agglomerate because of not being capped by capping agents. In contrast, biological synthesis of inorganic nanomaterials occurs under ambient conditions, namely room temperature, atmospheric pressure, and physiological pH. These methods are reliable, eco-friendly, and cheap. In this paper, we report for the first time the extracellular and intracellular synthesis of gold nanoparticles (GNPs) using living peanut seedlings. The formed GNPs were highly stable in solution and inside the plant tissue. Transmission electron microscopy revealed that extracellular GNPs distributions were in the form of monodispersed nanoparticles. The nanoparticles ranged from 4 to 6 nm in size. The intercellular nanoparticles were of oval shape and size ranged from 5 to 50 nm. Both extracellular and intracellular nanoparticles were further characterized by standard techniques. The formed GNPs inside the plant tissue were estimated by inductively coupled plasma spectrometry. This opens up an exciting possibility of a plant-based nanoparticle synthesis strategy, wherein the nanoparticles may be entrapped in the biomass in the form of a film or produced in the solution, both of which have interesting applications.

}, keywords = {cells, extracellular, living plant, Peanut, root, TEM}, issn = {0885-4513}, doi = {10.1002/bab.1049}, author = {Raju, Dugyala and Mehta, Urmil J. and Ahmad, Absar} } @article { ISI:000309462100003, title = {SHI irradiation induced effects in functionalized MWCNTs}, journal = {Radiation Effects and Defects in Solids}, volume = {167}, number = {8, SI}, year = {2012}, month = {FEB}, pages = {569-576}, publisher = {TAYLOR \& FRANCIS LTD}, address = {4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND}, abstract = {

Multi-walled carbon nanotubes (MWCNTs) have attracted extensive attention globally due to their applications in modern nanotechnology. It is very important to study the effects on these MWCNTs under swift heavy ion (SHI) irradiation since ion irradiation has been recognized as one of the best tools for nanostructuring of materials, in general. Here, we present the effects of 80MeV Ni ions with a fluence ranging from 3 x 10(12) to 3 x 10(13) ions/cm(2) on functionalized MWCNT mats. The properties of pristine and irradiated samples were studied using X-ray diffraction, Raman spectroscopy and transmission electron microscopy. The effects of SHI irradiation on these samples are discussed in detail.

}, keywords = {CNT, Raman, SHI, TEM}, issn = {1042-0150}, doi = {10.1080/10420150.2012.660939}, author = {Saikiran, V. and Pathak, A. P. and Rao, N. Srinivasa and Devaraju, G. and Debgupta, Joyashish and Kyriakou, I. and Emfietzoglou, D.} } @article { ISI:000299332500004, title = {Sodium-doped lithium zirconate nano squares: synthesis, characterization and applications for CO2 sequestration}, journal = {Journal of Sol-Gel Science and Technology}, volume = {61}, number = {2}, year = {2012}, month = {FEB}, pages = {316-320}, publisher = {SPRINGER}, address = {VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS}, abstract = {

Nano squares of sodium-doped lithium zirconate have been synthesized by a simple citrate based sol-gel method at room temperature in the presence of cetyl trimethylammonium bromide (CTAB) as a surfactant. The structural and morphological properties were investigated by X-ray diffraction (XRD) and Transmission Electron Microscopy (TEM) respectively. XRD analysis of sample calcined at 900 A degrees C for 4 h shows the formation of monoclinic lithium zirconate phase. The TEM shows the interesting morphology of formation of nano squares of sodium doped lithium zirconate sample. The carbon dioxide sorption capacity was carried out by TGA analysis at different high temperatures. It is observed that the sample shows similar to 20 wt\% carbon dioxide sorption at higher temperature (650 A degrees C) within 20 min which are better than the known reports.

}, keywords = {Carbon dioxide, CTAB, Lithium zirconate, Sodium doped lithium zirconate, sol-gel, TEM, XRD}, issn = {0928-0707}, doi = {10.1007/s10971-011-2629-y}, author = {Khokhani, Mrinal and Khomane, Ramdas B. and Kulkarni, Bhaskar D.} } @article { ISI:000317836000016, title = {Extra- and intracellular gold nanoparticles synthesis using live peanut callus cells}, journal = {Current Nanoscience}, volume = {9}, number = {1}, year = {2013}, month = {FEB}, pages = {107-112}, publisher = {BENTHAM SCIENCE PUBL LTD}, address = {EXECUTIVE STE Y-2, PO BOX 7917, SAIF ZONE, 1200 BR SHARJAH, U ARAB EMIRATES}, abstract = {

An important challenge of considerable topical significance in nanotechnology is the development of eco-friendly experimental processes for the synthesis of nanomaterials in large quantities with variable sizes, shapes and chemical compositions. Green synthesis routes for the production of inorganic metal nanoparticles using whole cell of microorganisms and plant extracts are gaining tremendous popularity as these are non-toxic, cheap and occur at ambient conditions. The present work emphasizes on gold nanoparticles synthesis protocol using live plant callus cells. Peanut callus cells when incubated with HAuCl4 solution in ambient conditions reduced the precursor and lead to formation of well dispersed, water soluble extracellular and intracellular gold nanoparticles within 24 hours. The biosynthesis of gold nanoparticles was monitored by UV-visible spectroscopy (UV-Vis) and further characterized by X-ray diffraction analysis (XRD), Energy Dispersive Spectroscopy (EDS) and Selected Area Electron Diffraction (SAED). The particle size distribution shows that the average particle size is 50 nm for extra-and 31 nm for intracellular gold nanoparticles. The nanoparticles may be stabilized by proteins secreted by callus cells. The reduction process is believed to occur enzymatically, thus creating the possibility of a rational, plant cell-based method for the synthesis of nanoparticles over a wide range of chemical compositions.

}, keywords = {Biosynthesis, callus, gold nanoparticles, live cells, Peanut, TEM}, issn = {1573-4137}, author = {Raju, D. and Mehta, Urmil J. and Ahmad, Absar} } @article { ISI:000318577600145, title = {Liquefied petroleum gas sensing performance of cerium doped copper ferrite}, journal = {Ceramics International}, volume = {39}, number = {5}, year = {2013}, month = {JUL}, pages = {5901-5907}, publisher = {ELSEVIER SCI LTD}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND}, abstract = {

Undoped and cerium (Ce) doped nanocrystalline copper ferrite (CuFe2O4) materials were synthesized via the molten-salt (M-S) method. Effects of Ce doping on the structural, morphological and gas sensing properties of the CuFe2O4 ferrite have been investigated. X-ray diffraction (XRD) analysis revealed the formation of spinel CuFe2O4. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) investigations showed that the synthesized ferrite is made up of very fine spherical nanoparticles. Moreover, the gas sensing properties of sintered samples were studied towards different reducing gases such as liquefied petroleum gas (LPG), acetone, ethanol and ammonia. The sample with 4\% cerium doped CuFe2O4 (Ce4) showed the maximum gas sensitivity (86\%) towards LPG with fast response time of 5 s and good recovery time of 68 s. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

}, keywords = {Ferrite, Gas sensor, Molten-salt method, TEM}, issn = {0272-8842}, doi = {10.1016/j.ceramint.2013.01.010}, author = {Khandekar, M. S. and Tarwal, N. L. and Patil, J. Y. and Shaikh, F. I. and Mulla, Imtiaz S. and Suryavanshi, S. S.} } @article { ISI:000320148900002, title = {Phytosynthesis of silver nanoparticles by semecarpus anacardium L. leaf extract}, journal = {Materials Letters}, volume = {102}, year = {2013}, month = {JUL}, pages = {5-7}, publisher = {ELSEVIER SCIENCE BV}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

Green synthesis of silver nanoparticles (AgNPs) using Semecmpus anacardium L leaf extract was studied. The reduction of silver (Ag+) ions was characterized by using UV-vis spectrophotometer showing formation of AgNPs within 15-20 mm. A time dependent reaction showed the increase in the nanoparticles (NPs) with time. Transmission electron microscopy (TEM) analysis showed that the synthesized AgNPs varied from 10 to 25 nm and has spherical shape. The Fourier transform infrared (FTIR) analysis showed that phenols and protein were responsible for the formation of the AgNPs. The energy dispersive spectroscopy (EDAX) analysis confirms the formed NPs were of silver. The quantification of AgNPs was studied by inductive coupled plasma spectrometry (ICP-AES). The important outcome of this work can be value addition to the medicinal plants in synthesis of NPs for biomedical applications. (C) 2013 Elsevier B.V. All rights reserved.

}, keywords = {FTIR, Leaf extract, Nanoparticles, Semecarpus anacardium, synthesis, TEM}, issn = {0167-577X}, doi = {10.1016/j.matlet.2013.03.091}, author = {Raju, D. and Hazra, Sulekha and Mehta, Urmil J.} } @article { ISI:000338818800044, title = {Biological synthesis of cationic gold nanoparticles and binding of plasmid DNA}, journal = {Materials Letters}, volume = {129}, year = {2014}, month = {AUG}, pages = {159-161}, publisher = {ELSEVIER SCIENCE BV}, type = {Article}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

Nanobiotechnology is the development of eco-friendly experimental processes for the synthesis of nanomaterials. The present work focuses on synthesis of cationic gold nanoparticles (C-GNPs) for biological applications, especially in gene and drug delivery studies. A biosynthesis methodology has been developed for the functionalization of gold nanoparticles to cationic nature. The synthesis of C-GNPs was done by using peanut leaf extract in the presence of cysteamine. The formed C-GNPs were characterized by using UV-visible spectroscopy (UV-vis), the particles sizes and shapes were confirmed by a Transmission electron microscope (TEM) and crystallinity of C-GNPs was characterized by diffraction. The binding of plasmid DNA on the C-GNPs was confirmed by agarose gel electrophoresis. (C) 2014 Elsevier B.V. All rights reserved.

}, keywords = {Biomaterials, Cationic, Nanoparticles, Plasmid DNA, synthesis, TEM}, issn = {0167-577X}, doi = {10.1016/j.matlet.2014.05.021}, author = {Raju, D. and Vishwakarma, Rishi K. and Khan, Bashir Mohammad and Mehta, Urmil J. and Ahmad, Absar} } @article {45977, title = {Extracellular synthesis of silver nanoparticles using living peanut seedling}, journal = {Applied Nanoscience}, volume = {4}, year = {2014}, month = {OCT}, pages = {875-879}, type = {Article}, abstract = {

Synthesis of nanoparticles by environment friendly method is an important aspect of nanotechnology. In the present study, extracellular reduction of silver ions to silver nanoparticles was carried out using living peanut plant. The electron microscopic analysis shows that the formed nanoparticles were of different shapes and sizes. The formed nanoparticles were polydispersed. The shapes of the nanoparticles were spherical, square, triangle, hexagonal and rod. Most of the particles were spherical and 56 nm in size. EDS analysis confirmed the formed nanoparticles were of silver. The crystalline nature of nanoparticles was confirmed by diffraction. This method opens up an exciting possibility of plant-based synthesis of other inorganic nanomaterials. This study confirms the synthesis of extracellular silver nanoparticles by living plant.

}, keywords = {Nanoparticles, Shapes, Silver, synthesis, TEM}, issn = {2190-5509}, doi = {10.1007/s13204-013-0269-y}, author = {Raju, D. and Paneliya, Nikita and Mehta, Urmil J.} } @article { ISI:000341455400031, title = {Humidity-sensing studies of cerium oxide nanoparticles synthesizedby non-isothermal precipitation}, journal = {Sensors and Actuators B-Chemical}, volume = {203}, year = {2014}, month = {NOV}, pages = {229-238}, publisher = {ELSEVIER SCIENCE SA}, address = {PO BOX 564, 1001 LAUSANNE, SWITZERLAND}, abstract = {

We report the fabrication of a highly sensitive and fast humidity sensor based on cerium oxide (CeO2) nanoparticles, which were prepared at low cost via a simple non-isothermal precipitation method. The asprepared CeO2 nanoparticles were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy( TEM) and the results indicated the formation of face centered cubic phase of CeO2 with average crystallite size of approximately 10-12 nm. Humidity sensors based on CeO2 nanoparticles exhibit high and linear response within the whole relative humidity (RH) range of 11-97\% at an operating frequency of 60 Hz. The corresponding impedance changes by approximately three orders of magnitude within the entire humidity range from 11\% to 97\% RH. The response and recovery times are about 2-3 and 9-10 s, respectively, when RH was switched between 11\% and 97\%. Furthermore, the sensors also show relatively small hysteresis, excellent reproducibility, long term stability and broad range of operation (11-97\% RH). The complex impedance spectra of the sensor at different RHs and the equivalent circuit were analyzed to explore the humidity-sensing mechanism. This study demonstrates that the CeO2 nanoparticles prepared by non-precipitation method can be used as the humidity-sensing material for the fabrication of humidity sensors. (C) 2014 Elsevier B. V. All rights reserved.

}, keywords = {CeO2 nanoparticles, Complex impedance spectra, humidity sensor, Non-isothermal precipitation, TEM}, issn = {0925-4005}, doi = {10.1016/j.snb.2014.06.107}, author = {Khadse, V. R. and Thakur, Sharada and Patil, K. R. and Patil, Pradip} } @article { ISI:000336107400002, title = {Living plant-mediated synthesis of different shaped gold nanoparticles}, journal = {Nanoscience and Nanotechnology Letters}, volume = {6}, number = {4}, year = {2014}, month = {APR}, pages = {279-283}, publisher = {AMER SCIENTIFIC PUBLISHERS}, address = {26650 THE OLD RD, STE 208, VALENCIA, CA 91381-0751 USA}, abstract = {

We demonstrate extracellular green synthesis of gold nanoparticles with different shapes and sizes by using live Prosopis juliflora L. seedling. The conversion of ionic to metallic gold nanoparticles by P. juliflora seedling was carried out in short period. The formed nanoparticles were characterized by UV, TEM, Diffraction and EDS. TEM shows well dispersed particles of different shapes and sizes. The percentage of different shapes of nanoparticles was calculated, most of the particles were spherical in shape (75\%). The triangle nanoparticles were 10\%, followed by squares (8\%), hexagonal (5\%) and rods (2\%). The diffraction shows the formed nanoparticles are crystalline in nature and EDS confirms the formed nanoparticles are of gold. This shows P. juliflora seedling can synthesis different shapes of well dispersed nanoparticles.

}, keywords = {Gold, Nanoparticles, Prosopis juliflora, Shapes, synthesis, TEM}, issn = {1941-4900}, doi = {10.1166/nnl.2014.1756}, author = {Raju, D. and Paneliya, Nikita and Mehta, Urmil J.} } @article { ISI:000330820500057, title = {Nanocrystalline Ce doped CoFe2O4 as an acetone gas sensor}, journal = {Ceramics International}, volume = {40}, number = {1, A}, year = {2014}, month = {JAN}, pages = {447-452}, publisher = {ELSEVIER SCI LTD}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND}, abstract = {

Nanocrystalline CoFe2-xCexO4 ferrites (x=0, 0.04, 0.08) were synthesized by using the inexpensive, simple and eco-friendly molten-salt (M-S) method. Effects of Ce doping on the structural, morphological and gas sensing properties of the CoFe2O4 ferrite were investigated. X-ray diffraction (XRD) analysis revealed the formation of spinel CoFe2O4. Transmission electron microscopy (TEM) investigations showed that the synthesized ferrite is made up of very fine spherical nanoparticles. Furthermore, the gas response of nanocrystalline ferrite materials was investigated in the temperature range of 200-450 degrees C toward the reducing gases like liquefied petroleum gas (LPG), acetone, ethanol and ammonia. The sensor response was found to be sensitive and selective toward acetone as compared to other reducing gases. It is observed that the addition of Ce (4 wt\%) strongly influenced the response and the operating temperature of the sensor material and thus can serve as acetone-sensing sensors. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

}, keywords = {CoFe2O4, Ferrite, Gas sensor, Molten-salt method, TEM}, issn = {0272-8842}, doi = {10.1016/j.ceramint.2013.06.021}, author = {Khandekar, M. S. and Tarwal, N. L. and Mulla, Imtiaz S. and Suryavanshi, S. S.} } @article { ISI:000362426800004, title = {Efficient sorption and photocatalytic degradation of malachite green dye onto NiS nanoparticles prepared using novel green approach}, journal = {Korean Journal of Chemical Engineering}, volume = {32}, number = {10}, year = {2015}, month = {OCT}, pages = {1986-1992}, publisher = {KOREAN INSTITUTE CHEMICAL ENGINEERS}, address = {F.5, 119, ANAM-RO, SEONGBUK-GU, SEOUL 136-075, SOUTH KOREA}, abstract = {

The extract of the Asparagus racemosus leaf tissue works as a stabilizing and capping agent and assists the formation of stable colloidal nanoparticles. Nanoparticles were characterized using UV-vis spectrophotometer, photoluminescence, TEM, EDAX and XRD, respectively. Transmission electron microscopy followed by selected area electron diffraction pattern analysis indicated the formation of near spherical, polydispersed, crystalline NiS of diameter ranging from 4-27 nm. X-ray diffraction studies showed the formation of 110, 101, 300, 021, 220, 221, 131, 410, 401, 321, 330 and 021 planes of hexagonal NiS. EDAX analysis confirmed the presence of Ni and S in nanosphere. The maximum sorption capacity (q (m) ) of NiS nanoparticles for MG dye was found to be 64.85 mg/g. Decolorization as well as disintegration of malachite green under white light illumination was confirmed by LC-MS studies. Results of the present study suggest that nanosized NiS can play an instrumental role in photocatalytic degradation of malachite green dye present in water bodies.

}, keywords = {Degradation, FTIR, Malachite Green, NiS Nanoparticles, TEM}, issn = {0256-1115}, doi = {10.1007/s11814-015-0041-y}, author = {Prasad, Kumar Suranjit and Prajapati, Sheel and Selvaraj, Kaliaperumal} } @article { ISI:000364521100015, title = {Microbial selenium nanoparticles (SeNPs) and their application as a sensitive hydrogen peroxide biosensor}, journal = {Applied Biochemistry and Biotechnology}, volume = {177}, number = {6}, year = {2015}, month = {NOV}, pages = {1386-1393}, publisher = {HUMANA PRESS INC}, address = {999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 USA}, abstract = {

The cell-free extract, a crude enzyme (cytosolic and membrane fraction) obtained from an environmental isolate, Bacillus pumilus sp. BAB-3706 worked as excellent in reducing as well as stabilizing agent and facilitated the formation of stable colloidal selenium nanoparticles (SeNPs). Resulting nanoparticles were characterized using UV-vis spectrophotometer, TEM, EDAX, FT-IR and XRD, respectively. A working electrode was modified by coating the surface of indium tin oxide (ITO) with colloidal SeNPs. Successive additions of H2O2 (100 to 600 mu M) in conventional three electrodes system, cyclic voltammeter with potential scan rate 25.0 mV/s, in 0.1 M phosphate buffer solution (PBS) yielded increase in current. A perpetual amperometric response at fixed potential (-1.0 V) and at selected time interval of 100 s showed different magnitude of current at every addition of H2O2. The linear range of detection of H2O2 was from 5 to 600 mM (R (2) = 0.9965), while the calculated limit of detection was found to be 3.00 mu M. The current study suggested that microbial SeNPs can be used for fabrication of low cost, sensitive H2O2 biosensor.

}, keywords = {Biosensor, EDAX, Hydrogen peroxide, Selenium nanoparticles, TEM, UV-vis spectroscopy}, issn = {0273-2289}, doi = {10.1007/s12010-015-1814-9}, author = {Prasad, Kumar Suranjit and Vaghasiya, Jayraj V. and Soni, Saurabh S. and Patel, Jitesh and Patel, Rinkesh and Kumari, Madhu and Jasmani, Falguni and Selvaraj, Kaliaperumal} } @article {45714, title = {Enhanced field emission characteristics of a 3D hierarchical Hfo2-Zno heteroarchitecture}, journal = {ChemistrySelect}, volume = {2}, year = {2017}, month = {MAR}, pages = {2305-2310}, type = {Article}, abstract = {

Three dimensional (3D) HfO2-ZnO heteroarchitecture comprised of thin coating of HfO2 on self assembled 3D ZnO urchins with pointed apex has been synthesized using hydrothermal route followed by Pulsed Laser Deposition (PLD). The as-synthesized HfO2-ZnO heteroarchitecture was characterized using XRD, SEM, EDS, and (HR) TEM, in order to reveal its structural, morphological, and chemical properties. The HfO2-ZnO heteroarchitecture emitter exhibits superior field emission (FE) behaviour in contrast to the pristine ZnO urchins, demonstrated by delivery of high emission current density of similar to 885 mA/cm2 at an applied field of similar to 3.35 V/mm, against similar to 383 mA/cm(2) at an applied field of similar to 4.32 V/mu m for the pristine ZnO urchins emitter. Interestingly, the HfO2-ZnO heteroarchitecture emitter exhibits excellent emission current stability characterized with fewer fluctuations, owing to very good ion-bombardment resistance offered by the HfO2 coating. Furthermore, the heteroarchitecture thus obtained facilitates tailoring of the morphology with high aspect ratio and modulation of electronic properties as well, thereby enhancing the FE behaviour. Despite HfO2 being wide band gap and high-k material, the HfO2-ZnO heteroarchitecture exhibits potential as promising candidate for fabrication of high current density cold cathode

}, keywords = {3D heteroarchitecture, Field Emission (FE), hydrothermal, PLD, TEM}, issn = {2365-6549}, doi = {10.1002/slct.201601723}, author = {Shisode, Raju T. and Suryawanshi, Sachin R. and Mistari, Chetan D. and Late, Dattatray J. and More, Mahendra A.} } @article {46144, title = {Development and evaluation of taxon-specific primers for the selected Caudovirales taxa}, journal = {Virus Research}, volume = {263}, year = {2019}, month = {APR }, pages = {184-188}, type = {Article}, abstract = {

The phage taxonomy is primarily based on the morphology derived from Transmission Electron Microscopic (TEM) studies. TEM based characterization is authentic and accepted by scientific community. However, TEM based identification is expensive and time consuming. After the phage isolation, before analysis TEM, a DNA based rapid method could be introduced. The DNA based method could dramatically reduce the number of samples analyzed by TEM and thereby increase the speed and reduce the cost of identification. In the present work, four environmental phage isolates were identified based on TEM studies and genome size. The identification of these four phages was validated using DNA based method. The taxon-specific DNA markers were identified through multiple sequence alignments. The primers were designed at conserved genes (DNA polymerase or integrase) of 4 different phage taxa viz. family Ackermannviridae, genus Jerseyvirus, genus T4virus, and genus P22virus. These primers were evaluated using both in vitro and in silico approach for the amplification of the target taxons. Majority of the primer sets were found to amplify member species of the targeted taxa in vitro. In In silico analysis, six primer sets intended for identification of family Ackermannviridae showed positive amplification of \>= 86.7\% classified species. Further, the primers targeting the genus Jerseyvirus and T4virus showed the amplification of 53.8\% and \>= 84.6\% species, respectively. The present work is a case study performed to explore the possibility of use of taxon-specific primers for identification and taxonomic studies of newly isolated phages to supplement the TEM.

}, keywords = {Bacteriophage, DNA markers, Pcr, Primers, Taxonomy, TEM}, issn = {0168-1702}, doi = {10.1016/j.virusres.2019.02.005}, author = {Newase, Sandeep K. and Gupta, Alka and Dastager, Syed G. and Kapadnis, Balu P. and Shashidhar, Ravindranath} } @article {46038, title = {MWCNTs-ZnO-SiO2 mesoporous nano-hybrid materials for CO2 capture}, journal = {Journal of Alloys and Compounds}, volume = {800}, year = {2019}, month = {SEP}, pages = {279-285}, type = {Article}, abstract = {

Carbon nanostructures and metal nanoparticles based nanohybrid materials have been established as one of advantageous materials for various applications. Here, we present hydrothermal and sol-gel process at low temperature for the synthesis of (3-Aminopropyl) triethoxysilane (APTES)-ZnO-multi-walled carbon nanotubes (MWCNTs) mesoporous nanohybrid materials. TEM and XPS measurements show that uniform size and quasi-spherical ZnO nanoparticles were anchored to the surface of the MWCNTs. SEM observation exhibits that the aggregation of ZnO nanoparticles is greatly reduced due to the steric repulsion of grafted organic groups. The maximum CO2 adsorption capacity at 273 K was 1.32 mmol/g for MWCNTs-APTES-ZnO-B nanohybrid. An increase in the density of ZnO nanoparticles on the surface of MWCNTs resulted in a higher affinity towards CO2 at low pressure. This work provides new research directions for making further advances toward practical utilization of MWCNTs-based CO2 adsorbents. (C) 2019 Published by Elsevier B.V.

}, keywords = {CO2 capture, Mesoporous, MWCNTs, Nanohybrid, TEM, XPS}, issn = {0925-8388}, doi = {10.1016/j.jallcom.2019.06.011}, author = {Jena, Kishore K. and Panda, Amulya Prasad and Verma, Savita and Mani, Ganesh Kumar and Swain, S. K. and Alhassan, Saeed M.} }