01958nas a2200229 4500008004100000022001400041245011700055210006900172260009200241300001400333490000600347520110700353653002301460653002001483653001601503653000801519100002001527700002001547700001901567700001801586856012401604 2006 eng d a1533-488000aDirect synthesis of nanocrystalline silver from the reaction between silver carboxylates and n-trioctylphosphine0 aDirect synthesis of nanocrystalline silver from the reaction bet a26650 THE OLD RD, STE 208, VALENCIA, CA 91381-0751 USAbAMER SCIENTIFIC PUBLISHERScJUL a2095-21020 v63 a

Neat n-Trioctylphosphine (TOP) has been used for the first ever time for reduction of silver nitrate and silver carboxylates (citrate, oleate, and myristate) under mild thermal reaction conditions. UV-visible absorption measurements of re-dispersible silver particles that were obtained by reduction of silver myristrate (product-IV) and silver nitrate (product-I) showed surface plasmon resonance absorption peak at 400 nm. The powder XRD pattern of fcc zero-valent silver resulted in diameters in the range of about 25-30 nm. TEM analysis showed particle diameter similar to that was observed by the XRD. FTIR spectroscopy revealed that the organics from the carboxylate group are retained by the nano-particles in case of product-IV however, presence of TOP is observed in product-I. It is found that when silver nitrate is reduced by TOP, spherical silver nano-particles with poor redispersity are formed but extended heating results in formation of long silver rods of micrometer size however, the re-dispersible nano-particles are easily formed when silver carboxylates are reduced by TOP.

10aChemical synthesis10aNanocrystalline10anoble metal10aXRD1 aCharan, Shobhit1 aSingh, Narendra1 aKhanna, P., K.1 aPatil, K., R. uhttps://library.ncl.res.in/content/direct-synthesis-nanocrystalline-silver-reaction-between-silver-carboxylates-and-n-001952nas a2200229 4500008004100000022001400041245014000055210006900195260007300264300001400337490000700351520108200358653002301440653001601463653003001479653001801509100001901527700001401546700002001560700001801580856012401598 2006 eng d a0167-577X00aSynthesis of beta-Ag2Se from organo-selenium precursor and silver nitrate in DMF via simultaneous reduction of selenium and silver salt0 aSynthesis of betaAg2Se from organoselenium precursor and silver  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAUG a2080-20850 v603 a

Reaction of selenium powder and silver nitrate in aqueous N,N'-dimethylformamide (aq. DMF) leads to formation of silver selenide. Similar reaction with cycloalkeno-1,2,3-selenadiazole an organic compound of selenium upon thermolysis, also produces silver selenide. It is believed that DMF activates selenium and reduces silver salt via in-situ generated hydrogen ion simultaneously. Slightly broadened X-ray diffraction pattern for pure beta silver selenide (beta-Ag2Se) was observed. Scanning electron microscopy (SEM) indicated that the agglomerated particles could be in the range of about 100 to 200 nm in dimension. EDAX analysis showed non-stoichiometric elemental ratio between silver and selenium. It is found that the weight percent of Ag is slightly higher than Se. However, free amorphous selenium is also detected by XPS analysis when the product is made by use of elemental selenium. Thermal analysis (TGA) revealed a small (4%) weight loss due to the presence of organics or the solvent from the reaction medium. (c) 2005 Elsevier B.V. All rights reserved.

10aChemical synthesis10anano powder10anoble metal chalcogenides10aSemiconductor1 aKhanna, P., K.1 aSingh, N.1 aCharan, Shobhit1 aPatil, K., R. uhttps://library.ncl.res.in/content/synthesis-beta-ag2se-organo-selenium-precursor-and-silver-nitrate-dmf-simultaneous-002131nas a2200241 4500008004100000022001400041245010800055210006900163260007300232300001400305490000700319520127900326653002301605653001801628653001801646653000801664100002001672700002001692700001801712700002201730700001901752856011801771 2006 eng d a0167-577X00aUnusual formation of nano-particles of CdO and Cd(OH)(2) from the reaction of dimethyl cadmium with DMF0 aUnusual formation of nanoparticles of CdO and CdOH2 from the rea aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcDEC a3492-34980 v603 a

This paper presents generation of CdO and Cd(OH)(2) nano-particles from Dimethyl Cadmium in DMF. The CdO nano-particles were obtained instead of CdSe, even when the reaction was done in presence of 1,2,3-selenadiazole (the source of selenium) with Me2Cd in DMF (product-I). The direct reaction of Me2Cd in DMF also leads to formation of CdO (product-II). However, Cd(OH)(2) nano-particles were obtained when Me2Cd was refluxed in DMF for a few hours followed by reaction of H2S gas (product-III). The formation of Cd(OH)(2) was also established via decomposition Of Me2Cd:Et2O adduct (product-IV). Nano-particles of CdO and Cd(OH)(2) (product-I to product-IV) were characterized by X-ray powder diffraction (XRD), TEM and SEM/EDS measurements, FTIR, thermal analysis (TGA) and XPS analysis. The particle size of all the products as calculated by XRD patterns were in the range of about 20 nm. TEM images showed that the products are agglomerated clusters with the particles in the nano-meter regime. The synthesis however, is understood to be unusual as the reactions with selenium source and sulfur source should have generated the CdSe and CdS however, the end products were always found to be the product-I to product-IV (c) 2006 Elsevier B.V. All rights reserved.

10aChemical synthesis10aNanoparticles10aSemiconductor10aXRD1 aSingh, Narendra1 aCharan, Shobhit1 aPatil, K., R.1 aViswanath, A., K.1 aKhanna, P., K. uhttps://library.ncl.res.in/content/unusual-formation-nano-particles-cdo-and-cdoh2-reaction-dimethyl-cadmium-dmf-002051nas 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

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.

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-0