X-ray photoelectron spectroscopy studies on core-shell structured nanocomposites

Mukherjee, M. ; Basu, S. ; Ghosh, B. ; Chakravorty, D. (2007) X-ray photoelectron spectroscopy studies on core-shell structured nanocomposites Applied Surface Science, 253 (20). pp. 8463-8469. ISSN 0169-4332

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S01694...

Related URL: http://dx.doi.org/10.1016/j.apsusc.2007.04.017

Abstract

Core-shell nanostructures were grown in silica-based glasses. Copper-copper oxide and iron-iron oxide structures had diameters in the range 3-6 nm, with shell thicknesses ~1-2 nm. Silver-lithium niobate core-shell nanostructures had diameters in the range 4.2-46 nm and thicknesses varying from 2.2 to 22 nm. X-ray photoelectron spectroscopy studies were carried out on all these specimens. The analyses of these results show the presence of Cu+/Cu2+, Fe2+/Fe3+ and Nb4+/Nb5+ valence states in the above three systems. Electrical resistivity data were fitted satisfactorily to the small polaron hopping model in the case of copper and iron-containing specimens. The presence of ions in the lithium niobate shell provides direct evidence of the formation of localized states between which variable range hopping conduction can be effected.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Core-shell Structured; X-ray Photoelectron Spectroscopy
ID Code:7440
Deposited On:25 Oct 2010 11:32
Last Modified:28 May 2011 04:31

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