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ISRN NanomaterialsVolume 2012 2012, Article ID 865373, 8 pages

Research Article

Materials Science Programme, Indian Institute of Technology Kanpur, Kanpur 208016, India

Bio-Inspired Materials and Devices Laboratory BMDL, Center for Energy Harvesting Materials and Systems CEHMS, Virginia Tech, Blacksburg, VA 24061, USA

Department of Physics, Indian Institute of Technology Guwahati, Guwahati 781039, India

Received 23 September 2012; Accepted 11 October 2012

Academic Editors: C. Angeles-Chavez, B. A. Marinkovic, and B. Panchapakesan

Copyright © 2012 Nageswararao Budiredla et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

An attempt has been made here to synthesize nano-powders via sol-gel process. These powders are shown to possess an f.c.c. NaCl-type structure with a typical lattice parameter of  Å for when decomposition of dried oxalate gel product is carried out at 600°C for 2 h in air. Moreover, they exhibit i clusters-agglomerates of nanosize particles and ii high BET specific surface area 123.0–135.5 m

-g. Also, the infrared absorption spectra reveal their strong affinity to water. The UV-Vis absorption peaks appearing at ~202 nm, 296 nm, and 379 nm are associated with oxygen defect centres and correspond to the electronic transitions i , , or , ii , or and iii , respectively. The incorporation of Ni

ions causes some modifications in the energy levels and the optical absorbance characteristics. The suppression of a strong broad emission peak at 440 nm and improvement of a weak band at 400 nm in the photoluminescence PL spectrum arise due to decrease in population density of centres or F

dimmers and emergence of additional F

centres, respectively with increase in nickel content.





Autor: Nageswararao Budiredla, Ashok Kumar, Subhash Thota, and Jitendra Kumar

Fuente: https://www.hindawi.com/



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