Synthesis and photoluminescence properties of CdSe-Ag2Se and CdSe-Ag coaxial hetero-nanotube arrays
Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, P.R. China
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Revised: 8 December 2011
Accepted: 9 February 2012
Published online: 29 March 2012
We presented an easy-to-control non-galvanic method for synthesizing CdSe-Ag2Seand CdSe-Ag coaxial hetero-nanotube arrays in anodic aluminum oxide (AAO) template, and investigated their optical properties. Cation exchange method was used to convert the CdSe nanotube arrays into the CdSe-Ag2Se nanotube arrays. Compared with the CdSe nanotubes, the photoluminescence (PL) intensity of CdSe-Ag2Se decreased and the PL lifetime prolonged, which was attributed to the redistribution of the exciton relaxation and recombination processes. In contrast, the CdSe-Ag hetero-nanotube arrays displayed a short PL lifetime, which was mainly due to the interaction and energy transfer between the CdSe and Ag. Our findings may have potential applications in design of the optoelectronic devices.
© EDP Sciences, 2012