Kundu, Susmita and Jana, Sunirmal and Biswas, Prasanta Kumar (2005) Quantum confinement effect of in-situ generated Cu2O in a nanostructured zirconia matrix. Materials Science-Poland , 23 (1). pp. 7-14. ISSN 0137-1339

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Abstract

The incorporation of Cu2+ in zirconyl chloride octahydrate sol or solution was used as a precursor for dip coating. This resulted in the in-situ formation of nanostructured Cu2O quantum particles in the zirconia matrix. The size-dependent properties of the Cu2O quantum particles were observed when the films were annealed in the range of 200-600° C. A red shift of the UV band, ascribed to the transition from the copper d-shells to higher sublevels of the conduction band, was observed in the range of 260-315 nm due to an increase in the nanocrystallite size with increasing annealing temperature. Three types of emissions, blue, green, and yellow, were observed in films of relatively high thickness (around 120-130 nm) due to Wannier-like excitonic transitions. For films of relatively low thickness (50-70 nm) only green emission was observed. From lifetime measurements of samples annealed at 450 C it may be concluded that the short decay time is bi-exponential in character from ns to ps with the chi-square value of 1.005, which is due to the confinement of Cu2O quantum particles.

Item Type:	Article
Uncontrolled Keywords:	Sol-gel; Nanostructured Cu2O; Quantum confinement; Exciton; Short-life emission
Subjects:	Processing Science
Divisions:	Sol Gel
Depositing User:	Bula Ghosh
Date Deposited:	05 Mar 2012 11:12
Last Modified:	08 Feb 2017 10:01
URI:	http://cgcri.csircentral.net/id/eprint/958

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