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Highly photoactive heterostructures of PbO quantum dots on TiO2

Leelavathi, A and Mukherjee, B and Nethravathi, C and kundu, Subhajit and Dhivya, M and Ravishankar, N and Madras, Giridhar (2013) Highly photoactive heterostructures of PbO quantum dots on TiO2. In: RSC ADVANCES, 3 (43). pp. 20970-20977.

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Official URL: http://dx.doi.org/10.1039/c3ra44301a

Abstract

We present a non-hydrolytic sol-gel combustion method for synthesizing nanocomposites of PbO quantum dots on anatase TiO2 with a high surface area. XRD, electron microscopy, DRS, cathodoluminescence and BET were employed for structural, microstructural and optical characterization of the composites. The photocatalytic activity of TiO2 and PbO/TiO2 was investigated and compared with Degussa P-25. The results indicate that the photocatalytic activity of quantum dot dispersed TiO2 is higher than that of bare TiO2 and much higher than that of commercial Degussa P-25. The origin of enhanced photoreactivity of the synthesized material can be assigned to a synergetic effect of high surface area, higher number of active sites and an engineered band structure in the heterostructure. The mechanisms for photocatalytic activity are discussed based on production of photogenerated reactive species. The knowledge gained through this report open up ideal synthesis routes for designing advanced functional heterostructures with engineered band structure and has important implications in solar energy based applications.

Item Type: Journal Article
Additional Information: copyright for this article belongs to ROYAL SOC CHEMISTRY,ENGLAND
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Division of Interdisciplinary Research > Centre for Nano Science and Engineering
Depositing User: Id for Latest eprints
Date Deposited: 02 Jan 2014 09:46
Last Modified: 02 Jan 2014 09:49
URI: http://eprints.iisc.ac.in/id/eprint/48008

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