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Issue 30, 2014
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Enhanced emission properties of Au/SiO2/ZnO nanorod layered structure: effect of SiO2 spacer layer and role of interfacial charge transfer

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Abstract

SiO2 spacer layers of various thicknesses in between an Au and ZnO nanorod (NR) layer (Au/ZnO) have been introduced and the luminescence properties of the layered ensemble have been investigated. When ZnO NRs are grown directly on a granular Au layer, the ultraviolet (UV) emission of ZnO was enhanced nearly 2 times due to surface plasmon resonance (SPR) mediated charge transfer between Au and ZnO. A significant improvement is observed when the SiO2 spacer layer is introduced in between Au and ZnO. The UV/VIS emission intensity ratio of Au/SiO2/ZnO NRs' becomes ∼6 times higher than that of the pristine ZnO NRs. A SPR mediated electron transfer from Au/SiO2 to ZnO causes such an enhanced UV emission. The spacer diminishes the reverse electron transfer process from the conduction band of ZnO to the Fermi level of Au, a most competitive reason for PL quenching, which also accounts for the emission enhancement.

Graphical abstract: Enhanced emission properties of Au/SiO2/ZnO nanorod layered structure: effect of SiO2 spacer layer and role of interfacial charge transfer

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Article information


Submitted
03 Feb 2014
Accepted
14 Mar 2014
First published
18 Mar 2014

RSC Adv., 2014,4, 15466-15473
Article type
Paper

Enhanced emission properties of Au/SiO2/ZnO nanorod layered structure: effect of SiO2 spacer layer and role of interfacial charge transfer

M. Mahanti and D. Basak, RSC Adv., 2014, 4, 15466
DOI: 10.1039/C4RA00950A

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