Nano Archive

Synthesis of Cubic and Hexagonal CdTe Nanoparticles Dispersed in SiO2 Films: Role of Oxygen during Sintering

Dayal, Padullaparthi Babu and Shivaprasad, Sonnada M. and Mehta, Bodh Raj (2005) Synthesis of Cubic and Hexagonal CdTe Nanoparticles Dispersed in SiO2 Films: Role of Oxygen during Sintering. Japanese Journal of Applied Physics, 44 . 8222-8226 . ISSN Online: 1347 – 4065/ Print: 0021 - 4922

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Official URL: http://jjap.ipap.jp/link?JJAP/44/8222/

Abstract

Cadmium telluride nanoparticles dispersed in SiO2 films have been grown by the co-sputtering of elemental Cd, Te and SiO2 targets in argon atmosphere. The role of oxygen during annealing on the structural and optical properties of CdTe nanoparticles dispersed in SiO2 films has been studied. Formation of a CdTeO3 layer around the CdTe nanoparticle core due to ambient oxygen present in air results in structural defects and thus the formation of hexagonal CdTe nanoparticles in air-annealed samples. In vacuum-annealed samples, defect free and well-crystallized cubic CdTe nanoparticles are formed which show excitonic features in the absorption spectra. These results have been confirmed by carrying out i) annealing in vacuum and air ambiences in a sequence on the same sample and ii) by depositing an additional layer of SiO2 on the CdTe:SiO2 samples to prevent the diffusion of ambient oxygen.

Item Type:Article
Subjects:Physical Science > Nanophysics
Physical Science > Nano objects
Material Science > Nanochemistry
Material Science > Nanostructured materials
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:5065
Deposited By:JNCASR
Deposited On:27 May 2009 10:20
Last Modified:27 May 2009 10:20

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