02051nas a2200277   4500008004100000022001400041245009600055210006900151260008600220300001200306490000700318520111200325653001001437653002301447653001601470653001601486653002101502100001901523700001401542700001701556700001801573700002001591700001801611700001701629856012701646       2007                        eng d  a1553-317400aOne-step preparation of nanosized Ag-PdCo-powder and its alloy formation at low temperature0 aOnestep preparation of nanosized AgPdCopowder and its alloy form  a325 CHESTNUT ST, SUITE 800, PHILADELPHIA, PA 19106 USAbTAYLOR & FRANCIS INCcSEP  a531-5390 v373 a<p>Nano-sized silver-palladium co-powder has been synthesized from silver nitrate-palladium chloride by wet chemical method. The present experimental conditions are applied for the first time for Ag-Pd co-powders wherein sodium formaldehyde sulfoxylate (SFS) has been used as an external reducing agent to simultaneously reduce respective metal salts. SFS reduces the metal salts at room temperature thus prevents formation of bigger particles of the respective metals in co-powder. Powder X-ray diffraction measurements ( XRD) and Transmission electron microscopy ( TEM) suggest the formation of nano-sized Ag-Pd co-powder with particle diameter in the range of about 25 nm. SEM shows that the powder morphology changes with temperature. Heat treatment of 90: 10 (Ag:Pd) composition showed shift in XRD peaks indicating alloy formation of Ag/Pd at lower temperature. Thick-films generated by use of the co-powder resulted in Ag/Pd alloy at about 500 degrees C as confirmed by the XRD. Thermal analysis showed that Ag/Pd co-powders initially gain the weight due to oxidation followed by the weight loss.</p>10aalloy10aChemical synthesis10anano-powder10anoble metal10aTransition Metal1 aKhanna, P., K.1 aSingh, N.1 aKulkarni, D.1 aMarimuthu, R.1 aCharan, Shobhit1 aPatil, K., R.1 aJain, G., H.  uhttps://library.ncl.res.in/content/one-step-preparation-nanosized-ag-pdco-powder-and-its-alloy-formation-low-temperature-002208nas a2200205   4500008004100000022001400041245011100055210006900166260007100235300001400306490000800320520141000328100002601738700002301764700002401787700001801811700002901829700002001858856012401878       2010                        eng d  a1932-744700aObservation of photoconductivity in Sn-doped ZnO nanowires and their photoenhanced field emission behavior0 aObservation of photoconductivity in Sndoped ZnO nanowires and th  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcMAR  a3843-38490 v1143 a<p>Sn-doped ZnO nanowire films have been Successfully synthesized by electrodeposition oil zinc foil followed by annealing in air at 400 degrees C for 4 h. The XRD patterns of the annealed specimens exhibit I set of well-defined diffraction peaks indexed to the wurtzite phase of ZnO. The Surface morphology of the as-synthesized films showed a network of densely packed flakes/sheets oil the Substrate. However, upon annealing, the formation of ZnO nanowires, processing length in the range of several micrometers and diameter less than 150 nm, oil the entire substrate is observed. The relative atomic percentage of Sri, estimated from the energy dispersive spectra, was found to be 0.5 and 2.0 in the ZnO films deposited for 10 and 40 min durations, respectively. Front the field emission studies, the Values of the turn-on field and threshold field, required to draw emission Current density of 10 and 100 mu A/cm(2), are observed to be 0.68 and 1.1 V/mu m for 0.5% Sn-doped ZnO and 1.72 and 2.25 V/mu m for 2.0% Sn-doped ZnO, respectively. The field emission Current stability investigated for a duration Of h at the preset value of 100 mu A is found to be excellent. A prominent photoenhancement in the field emission Current upon visible light illumination of the Sn-doped ZnO nanowires films has been observed. This enhancement has been attributed to the photoconductivity of the Sn-doped ZnO.</p>1 aSheini, Farid, Jamali1 aMore, Mahendra, A.1 aJadkar, Sandesh, R.1 aPatil, K., R.1 aPillai, Vijaymohanan, K.1 aJoag, Dilip, S.  uhttps://library.ncl.res.in/content/observation-photoconductivity-sn-doped-zno-nanowires-and-their-photoenhanced-field-002040nas a2200241   4500008004100000022001400041245009700055210006900152260007400221300001200295490000700307520118300314653002301497653002201520653001901542653002001561100001901581700001901600700001801619700001801637700001801655856012501673       2010                        eng d  a1388-076400aOne-pot synthesis of oleic acid-capped cadmium chalcogenides (CdE: E = Se, Te) nano-crystals0 aOnepot synthesis of oleic acidcapped cadmium chalcogenides CdE E  aVAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDSbSPRINGERcJAN  a101-1090 v123 a<p>Surface-capped CdSe and CdTe nano-crystals (NCs) have been synthesized using cadmium acetate, oleic acid and respective tri-octylphosphine chalcogenide (TOPE; E = Se/Te) in diphenyl ether (DPE). Well-dispersed CdSe particles showed two absorption bands at the region of 431-34 and 458-60 nm in optical absorption study. A band-edge emission resulted at 515 nm with an excitation energy of 400 nm, in its photoluminescence (PL) spectrum. Similarly, UV-visible absorption study of CdTe revealed an absorption band at &lt; 700 nm. The broadened X-ray diffraction (XRD) pattern showed that at higher reaction temperature cubic CdSe but hexagonal CdTe can be obtained with crystallite size of &lt; 10 nm. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) revealed that agglomerated particles are of spherical nature. The inter-planar spacing in CdTe was measured to be 0.406 nm, a characteristic of (100) lattice plane in hexagonal CdTe. X-ray photoelectron spectroscopy (XPS) showed that CdSe NCs have better air stability stable than CdTe. Presence of organic moiety around the semiconductor particles was confirmed by infrared (IR) spectroscopy.</p>10aChemical synthesis10aphotoluminescence10aSemiconductors10aSurface capping1 aKhanna, P., K.1 aRao, Srinivasa1 aPatil, K., R.1 aSingh, V., N.1 aMehta, B., R.  uhttps://library.ncl.res.in/content/one-pot-synthesis-oleic-acid-capped-cadmium-chalcogenides-cde-e-se-te-nano-crystals-001955nas a2200265   4500008004100000022001400041245013900055210006900194260009500263300001200358490000800370520097100378653002201349653002801371653001801399653001201417653001501429100001801444700002001462700002501482700002001507700002001527700001801547856012401565       2011                        eng d  a0021-979700aOne-step in situ synthesis of NHx-adsorbed rhodium nanocrystals at liquid-liquid interfaces for possible electrocatalytic applications0 aOnestep in situ synthesis of NHxadsorbed rhodium nanocrystals at  a525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USAbACADEMIC PRESS INC ELSEVIER SCIENCEcJUN  a238-2440 v3583 a<p>Nearly monodisperse rhodium nanoparticles with adsorbed NHx were synthesized at the CCl4-water interface. The presence of NHx-adsorbed species was confirmed by energy-dispersive X-ray analysis (EDX) and X-ray photoelectron spectroscopy (XPS) studies. The synthesis of controlled size 2-38 nm rhodium particles was studied as a function of reducing agent concentration by transmission electron microscopy (TEM). HRTEM confirmed the formation of rhodium nanoparticles having fringe spacing consistent with reported Rh (1 1 1) planes. The continuity of these films over an area of 1 x 1 pm was revealed by atomic force microscopy (AFM) studies. The electrocatalytic application of these nanostructure Rh-NHx), thin films for formaldehyde oxidation in 0.5 M NaOH was investigated by cyclic voltammetry. The Rh nanoparticles formed by the present strategy are expected to be useful for other catalytic applications also. (C) 2011 Elsevier Inc. All rights reserved.</p>10aHydrazine hydrate10aLiquid-liquid interface10aNanoparticles10aRhodium10aThin films1 aPatil, V., S.1 aKrishna, S., R.1 aHawaldar, Ranjit, R.1 aGaikwad, A., B.1 aSathaye, S., D.1 aPatil, K., R.  uhttps://library.ncl.res.in/content/one-step-situ-synthesis-nhx-adsorbed-rhodium-nanocrystals-liquid-liquid-interfaces-001940nas a2200229   4500008004100000022001400041245011800055210006900173260007300242300001200315490000800327520106900335653002201404653002401426653001701450653002301467653002401490100002401514700001801538700002301556856013101579       2013                        eng d  a0022-231300aOne pot synthesis, growth mechanism and optical properties of Zn1-xCdxSe graded core/shell and alloy nanocrystals0 aOne pot synthesis growth mechanism and optical properties of Zn1  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcMAR  a154-1590 v1353 a<p>Comparatively higher photoluminescence yield along with robustness of core/shell semiconductor nanocrystals make them attractive candidates for studying intricate quantum size effects. Here, we report, one pot synthesis of Zn1-xCdxSe graded core/shell structures by exploiting change in the reactivity of precursors. Optical and structural measurements indicate formation of graded structure. Growth mechanism probed by inductively coupled plasma atomic emission spectroscopy shows formation of graded core/shell structure, with CdSe rich core and ZnSe rich shell. Annealing these nanocrystals, in chemical bath, leads to diffusion of Cd from core to shell region. Formation of Zn1-xCdxSe alloy is also observed in X-ray photoelectron spectroscopic measurements, confirming the diffusion of Cd from core to shell region. Substantially high photoluminescence quantum efficiency of 60% with narrow line width of about 27 nm, was observed and is attributable to the reduced strain due to graded core/shell structure. (C) 2012 Elsevier B.V. All rights reserved.</p>10aGraded core/shell10aII-VI Semiconductor10aLuminescence10aOptical properties10aSemiconductor alloy1 aSonawane, Kiran, G.1 aPatil, K., R.1 aMahamuni, Shailaja  uhttps://library.ncl.res.in/content/one-pot-synthesis-growth-mechanism-and-optical-properties-zn1-xcdxse-graded-coreshell-and-0