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Silver-decorated ZnO hexagonal nanoplate arrays as SERS-active substrates: An experimental and simulation study

Published online by Cambridge University Press:  13 December 2013

Kun Liu
Affiliation:
Institute of Near-field Optics and Nanotechnology, School of Physics and Optoelectronic Technology, Dalian University of Technology, Ganjingzi District, Dalian 116024, People’s Republic of China
Dawei Li
Affiliation:
Institute of Near-field Optics and Nanotechnology, School of Physics and Optoelectronic Technology, Dalian University of Technology, Ganjingzi District, Dalian 116024, People’s Republic of China
Rui Li
Affiliation:
Institute of Near-field Optics and Nanotechnology, School of Physics and Optoelectronic Technology, Dalian University of Technology, Ganjingzi District, Dalian 116024, People’s Republic of China
Qiao Wang
Affiliation:
Institute of Near-field Optics and Nanotechnology, School of Physics and Optoelectronic Technology, Dalian University of Technology, Ganjingzi District, Dalian 116024, People’s Republic of China
Shi Pan
Affiliation:
Institute of Near-field Optics and Nanotechnology, School of Physics and Optoelectronic Technology, Dalian University of Technology, Ganjingzi District, Dalian 116024, People’s Republic of China
Wei Peng
Affiliation:
Institute of Near-field Optics and Nanotechnology, School of Physics and Optoelectronic Technology, Dalian University of Technology, Ganjingzi District, Dalian 116024, People’s Republic of China
Maodu Chen*
Affiliation:
Institute of Near-field Optics and Nanotechnology, School of Physics and Optoelectronic Technology, Dalian University of Technology, Ganjingzi District, Dalian 116024, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

We have fabricated Ag-decorated ZnO nanoplate arrays by combining water-bath heating toward ZnO hexagonal nanoplate arrays and subsequent decoration of Ag films or nanoparticles on the ZnO surfaces by magnetron sputtering or photoreduction. Experimental surface-enhanced Raman scattering (SERS) results show that Ag-film–ZnO hybrid substrates with different Ag sputtering times exhibit a large difference in enhanced SERS signals for Rhodamine 6G (10−7 M). Atomic force microscope analysis reveals that two kinds of positions create abundant “hot spots” in this SERS substrate: one is located at the gap between adjacent separate Ag-film–ZnO hybrid nanoplates, and the other is located at the V-grooves formed by two adjacent interlaced Ag-film–ZnO hybrid nanoplates. The effects of simultaneous changes in interplate spacing and groove wall angle are considered to be the key factors affecting the SERS of our prepared Ag-film–ZnO hybrid substrates, which have also been evaluated by finite-difference time-domain simulation.

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Articles
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Copyright © Materials Research Society 2013 

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References

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