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Issue 5, 2011

Core–shell TiO2@ZnO nanorods for efficient ultraviolet photodetection

Author affiliations

Abstract

Core–shell TiO2@ZnO nanorods (NRs) have been fabricated by a simple two step method: growth of ZnO NRs' array by an aqueous chemical technique and then coating of the NRs with a solution of titanium isopropoxide [Ti(OC3H7)4] followed by a heating step to form the shell. The core–shell nanocomposites are composed of single-crystalline ZnO NRs, coated with a thin TiO2 shell layer obtained by varying the number of coatings (one, three and five times). The ultraviolet (UV) emission intensity of the nanocomposite is largely quenched due to an efficient electron–hole separation reducing the band-to-band recombinations. The UV photoconductivity of the core–shell structure with three times TiO2 coating has been largely enhanced due to photoelectron transfer between the core and the shell. The UV photosensitivity of the nanocomposite becomes four times larger while the photocurrent decay during steady UV illumination has been decreased almost by 7 times compared to the as-grown ZnO NRs indicating high efficiency of these core–shell structures as UV sensors.

Graphical abstract: Core–shell TiO2@ZnO nanorods for efficient ultraviolet photodetection

Article information


Submitted
18 Jan 2011
Accepted
07 Mar 2011
First published
11 Apr 2011

Nanoscale, 2011,3, 2336-2341
Article type
Paper

Core–shell TiO2@ZnO nanorods for efficient ultraviolet photodetection

S. Panigrahi and D. Basak, Nanoscale, 2011, 3, 2336 DOI: 10.1039/C1NR10064E

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