Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/61257
Title: Highly ordered Ag/Cu hybrid nanostructure arrays for ultrasensitive surface-enhanced raman spectroscopy
Authors: Chen, K
Zhang, X
Zhang, Y
Lei, DY 
Li, H
Williams, T
MacFarlane, DR
Keywords: benzenethiol
Hybrid nanostructures
Nanorod arrays
Surface-enhanced Raman spectroscopy
Ultrasensitive
Issue Date: 2016
Publisher: Wiley-VCH
Source: Advanced materials interfaces, 2016, v. 3, no. 13, 1600115 How to cite?
Journal: Advanced materials interfaces 
Abstract: Despite significant progress recently made in this field, the practical application of surface-enhanced Raman spectroscopy (SERS) is frequently limited by the lack of highly sensitive, reproducible, and cost-effective substrates. The fabrication of SERS substrates with a consistently high density of hot-spots is a key step to address this issue. Here, a simple approach is reported for the fabrication of Ag/Cu hybrid nanostructure arrays as highly sensitive and cost-effective substrates for SERS application. By effectively tuning the gap size between neighboring nanorods to sub-10 nm and increasing the packing density of nanorods, ordered Cu nanorod arrays can be used as cheap and effective SERS substrates in their own right. After sputtering a very thin layer of Ag nanoparticles on the surface of the Cu nanorods to get sub-5 nm gaps, further field enhancement is enabled. A cascaded field enhancement has been evidenced by the electromagnetic simulations. The Ag/Cu hybrid nanostructure arrays exhibit a detection limit down to 10−15 m for nonresonant molecules such as benzenethiol.
URI: http://hdl.handle.net/10397/61257
ISSN: 2196-7350
DOI: 10.1002/admi.201600115
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