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Rekha, Dasari,Kumar, Jengiti. Dilip,Jayaraj, Bellum,Lingappa, Y.,Chiranjeevi, Pattium Korean Chemical Society 2007 Bulletin of the Korean Chemical Society Vol.28 No.3
A micro organism Agrobacterium tumifacient as an immobilized cell on a solid support was presented as a new biosorbent in a simple and sensitive spectrophotometry determination of Ni(II) in various samples using 4-hydroxy benzaldehyde-4-bromophenyl hydrazone as a color developing agent (λmax 497 nm) at pH 4.0 ± 0.2. Beer's law was obeyed over the range of 0.01-0.1 μg L-1. The molar absorptivity and Sandell's sensitivity were 1.285 × 105 L mol-1cm-1 and 0.007245 μg cm-2 respectively. Under these conditions, the preconcentration factor obtained was 82, and the detection limit achieved was 0.05 μg L-1. The detailed study of various interfering ions made the method more sensitive and selective. The recovery of Ni(II) from various samples range from 97.75 to 99.35%. The present method was successfully applied for the determination of Ni(II) in spiked, natural water and alloy samples. The proposed method was compared with reported methods in terms of Student's ‘t'-test and Variance ratio ‘f'-test which indicates that there is no significant difference between proposed and literature method at 95% confidence level.
Al-doped ZnS layers synthesized by solution growth method
K. Nagamani,N. Revathi,P. Prathap,Y. Lingappa,K.T. Ramakrishna Reddy 한국물리학회 2012 Current Applied Physics Vol.12 No.2
ZnS is one of the potential candidates as a window/buffer layer for solar photovoltaic applications. Aldoped ZnS nanocrystalline films were grown by a simple and economic process, chemical solution growth method. The layers were prepared for different Al-dopant concentrations that vary in the range, 0e10 at. %. The effect of Al-doping on the composition, structure, optical, electrical and photoluminescence properties of the synthesized layers was determined using appropriate techniques. The elemental composition of a typical sample with 6 at. % ‘Al’ in ZnS was Zn ¼ 44.9 at. %, S ¼ 49.8 at. % and Al ¼ 5.3 at. %. The films were nanocrystalline in nature and showed (111) plane of ZnS as the preferred orientation for all the doping concentrations. The layers with 6 at. % of Al showed a crystallite size of w9 nm. The FTIR studies confirmed the presence of ZnS in the layers. The layers showed an average transmittance of w75% in the visible region. The change of photoluminescence behaviour with dopant concentration was also studied. The electrical resistivity was considerably decreased from 107 Ucm to 103 Ucm with Al-doping. The detailed analysis of results will be presented and discussed.
Dasari Rekha,Jengiti. Dilip Kumar,Bellum Jayaraj,Y. Lingappa,Pattium Chiranjeevi* 대한화학회 2007 Bulletin of the Korean Chemical Society Vol.28 No.3
A micro organism Agrobacterium tumifacient as an immobilized cell on a solid support was presented as a new biosorbent in a simple and sensitive spectrophotometry determination of Ni(II) in various samples using 4-hydroxy benzaldehyde-4-bromophenyl hydrazone as a color developing agent (lmax 497 nm) at pH 4.0 0.2. Beers law was obeyed over the range of 0.01-0.1 g L-1. The molar absorptivity and Sandells sensitivity were 1.285 105 L mol-1cm-1 and 0.007245 g cm-2 respectively. Under these conditions, the preconcentration factor obtained was 82, and the detection limit achieved was 0.05 g L-1. The detailed study of various interfering ions made the method more sensitive and selective. The recovery of Ni(II) from various samples range from 97.75 to 99.35%. The present method was successfully applied for the determination of Ni(II) in spiked, natural water and alloy samples. The proposed method was compared with reported methods in terms of Students t-test and Variance ratio f-test which indicates that there is no significant difference between proposed and literature method at 95% confidence level.