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Issue 43, 2013
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Highly photoactive heterostructures of PbO quantum dots on TiO2

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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.

Graphical abstract: Highly photoactive heterostructures of PbO quantum dots on TiO2

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The article was received on 11 Aug 2013, accepted on 30 Aug 2013 and first published on 02 Sep 2013

Article type: Paper
DOI: 10.1039/C3RA44301A
Citation: RSC Adv., 2013,3, 20970-20977
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    Highly photoactive heterostructures of PbO quantum dots on TiO2

    A. Leelavathi, B. Mukherjee, C. Nethravathi, S. Kundu, M. Dhivya, N. Ravishankar and G. Madras, RSC Adv., 2013, 3, 20970
    DOI: 10.1039/C3RA44301A

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