Journal
RSC ADVANCES
Volume 4, Issue 30, Pages 15466-15473Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ra00950a
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Funding
- US-India Partnership to Advance Clean Energy-Research (PACE-R) for the Solar Energy Research Institute for India
- United States (SERIIUS)
- U.S. Department of Energy (Office of Science, Office of Basic Energy Sciences, and Energy Efficiency and Renewable Energy, Solar Energy Technology Program) [DE-AC36-08GO28308]
- Government of India, through the Department of Science and Technology [IUSSTF/JCERDC-SERIIUS/2012]
- DAE-BRNS
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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.
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