02371nas a2200253 4500008004100000022001400041245012300055210006900178260007400247300001200321490000600333520142500339653002301764653001601787653002101803653002401824653001801848653002901866100002501895700002401920700002301944700001901967856013101986 2006 eng d a1388-076400aRole of ligands in the formation, phase stabilization, structural and magnetic properties of alpha-Fe2O3 nanoparticles0 aRole of ligands in the formation phase stabilization structural  aVAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDSbSPRINGERcOCT a635-6430 v83 a

The electrochemical synthesis of alpha Fe2O3 nanoparticles was performed using quaternary ammonium salts viz. TPAB, TBAB and TOAB in an organic medium by optimizing current density and molar concentration of the ligand. The role of ligands in the formation of alpha phase, structure and magnetic properties was investigated in details. The effect of increasing chain length on the particle size confirmed that as the chain length increases from propyl to octyl, the particle size decreases. X-ray diffraction spectra of as prepared samples and TEM analysis confirmed the amorphous nature of iron oxide. TEM showed beads of iron oxide joined together with a size distribution in the range of 6-30 nm. The Mossbauer studies also support this observation that for the lowest particle size, the line width is broader which successively reduces with increase in particle size. Iron oxide capped with TOAB indicated superparamagnetic nature at room temperature. The resultant internal magnetic field of 506 mm/s due to hyperfine splitting clearly established the formation of alpha-Fe2O3 The infrared spectroscopy and pH measurements revealed the binding of tetra alkyl ligand with iron oxide. The IR spectra and the increase in basicity of as prepared samples confirmed the formation of hydrated iron oxide. Above 800 degrees C the spectra indicated only iron oxide. Surface area obtained by BET method was 205 m(2)/g.

10aAlkyl chain length10aalpha-Fe2O310aElectrochemistry10amagnetic properties10aNanoparticles10anarrow size distribution1 aJoshi, Satyawati, S.1 aPatil, Prajakta, R.1 aNimase, Madhav, S.1 aBakare, P., P. uhttps://library.ncl.res.in/content/role-ligands-formation-phase-stabilization-structural-and-magnetic-properties-alpha-fe2o3-001477nas a2200217 4500008004100000022001400041245008700055210006900142260007300211300001400284490000800298520073400306653001101040653000801051653001301059653000801072100001801080700002501098700001801123856011801141 2010 eng d a0169-433200aInvestigations of CdS and Ag-CdS nanoparticles by X-ray photoelectron spectroscopy0 aInvestigations of CdS and AgCdS nanoparticles by Xray photoelect aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcDEC a1390-13940 v2573 a

In the present report, CdS and Ag-CdS nanoparticles were synthesized using cysteine as a capping agent. Surface properties CdS and Ag-CdS nanoparticles were studied by X-ray photoelectron spectroscopy (XPS). XPS study of CdS nanoparticles was carried out as a function of pH and for a refluxed sample at pH 11.2. Effect of dopant concentration on surface properties of Ag-CdS nanoparticles was also studied for as prepared samples as well as for annealed sample at 2% doping. Effect of pH, dopant concentration, and effect of particle size on different sulfur species present in the system was studied. Features of Cd 3d, S 2p and Ag 3d core level have been discussed in detail. (C) 2010 Elsevier B.V. All rights reserved.

10aAg-CdS10aCdS10aCysteine10aXPS1 aThakur, Priya1 aJoshi, Satyawati, S.1 aPatil, K., R. uhttps://library.ncl.res.in/content/investigations-cds-and-ag-cds-nanoparticles-x-ray-photoelectron-spectroscopy-001991nas a2200229 4500008004100000022001400041245011500055210006900170260010600239300001200345490000700357520109500364653002501459653001201484653001901496653002301515653001801538100002801556700002201584700002501606856013001631 2011 eng d a0025-540800aLow temperature pH dependent synthesis of flower-like ZnO nanostructures with enhanced photocatalytic activity0 aLow temperature pH dependent synthesis of flowerlike ZnO nanostr aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcMAY a771-7780 v463 a

In the present study we have synthesized flower-like ZnO nanostructures comprising of nanobelts of 20 nm width by template and surfactant free low-temperature (4 degrees C) aqueous solution route. The ZnO nanostructures exhibit flower-like morphology, having crystalline hexagonal wurtzite structure with (001) orientation. The flowers with size between 600 and 700 nm consist of ZnO units having crystallite size of similar to 40 nm. Chemical and structural characterization reveals a significant role of precursor: ligand molar ratio, pH, and temperature in the formation of single-step flower-like ZnO at low temperature. Plausible growth mechanism for the formation of flower-like structure has been discussed in detail. Photoluminescence studies confirm formation of ZnO with the defects in crystal structure. The flower-like ZnO nanostructures exhibit enhanced photochemical degradation of methylene blue (MB) with the increased concentration of ligand, indicating attribution of structural features in the photocatalytic properties. (C) 2010 Elsevier Ltd. All rights reserved.

10aCatalytic properties10aDefects10aNanostructures10aOptical properties10aSemiconductor1 aVaishampayan, Mukta, V.1 aMulla, Imtiaz, S.1 aJoshi, Satyawati, S. uhttps://library.ncl.res.in/content/low-temperature-ph-dependent-synthesis-flower-zno-nanostructures-enhanced-photocatalytic-002054nas a2200169 4500008004100000022001400041245012200055210006900177260007100246300001600317490000700333520134600340100002801686700002201714700002501736856012301761 2011 eng d a0743-746300aOptical and photocatalytic properties of single crystalline ZnO at the air-liquid interface by an aminolytic reaction0 aOptical and photocatalytic properties of single crystalline ZnO  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcOCT a12751-127590 v273 a

Crystalline flowerlike ZnO was synthesized by an aminolytic reaction at the air-liquid interface in an aqueous media at an alkaline pH. A thin visible film was formed at the air-liquid interface by self-assembly of flowerlike ZnO. Diffraction studies show rearrangement of the single crystalline units at the air-liquid interface leading to the formation of nanobelts. These nanobelts overlap systematically to form petals of the flowerlike structure; individual petals get curved with time. Each nanobelt is found to be single crystalline and can be indexed as the hexagonal ZnO phase. The organic product formed in the aminolytic reaction and dissolution-reprecipitation mechanism is the driving force for the formation of flowerlike ZnO at the air-liquid interface. A clear relationship between the surface, photocatalytic, and photoluminescent properties of ZnO is observed. The flowerlike structure exhibits a blue shift (3.56 eV) in the band emission as compared to bulk ZnO (3.37 eV). The photodegradation of methylene blue over the flowerlike ZnO catalyst formed at the air-liquid interface and in the sediments shows enhanced photocatalytic activity. The sub-bands formed due to surface defects facilitate separation of charge carriers increasing their lifetime, leading to enhanced photocatalytic activity of flowerlike ZnO.

1 aVaishampayan, Mukta, V.1 aMulla, Imtiaz, S.1 aJoshi, Satyawati, S. uhttps://library.ncl.res.in/content/optical-and-photocatalytic-properties-single-crystalline-zno-air-liquid-interface-0