Sensing based on surface-enhanced Raman scattering using self-forming ZnO nanoarrays coated with gold as substrates

Feng Tang; Pierre-Michel Adam; David J. Rogers; Vinod E. Sandana; Philippe Bove; Ferechteh H. Teherani

doi:10.1117/12.2302741

27 March 2018 Sensing based on surface-enhanced Raman scattering using self-forming ZnO nanoarrays coated with gold as substrates

Feng Tang, Pierre-Michel Adam, David J. Rogers, Vinod E. Sandana, Philippe Bove, Ferechteh H. Teherani

Author Affiliations +

Proceedings Volume 10533, Oxide-based Materials and Devices IX; 105331F (2018) https://doi.org/10.1117/12.2302741
Event: SPIE OPTO, 2018, San Francisco, California, United States

Abstract

Surface-Enhanced Raman spectroscopy (SERS) is a widely used technique adopted in both academia and industry for the detection of trace quantities of Raman active molecules. This is usually accomplished by functionalizing distributions of plasmonic metal nanoparticles with the analyte molecules. Recently metal-coated nanostructures have been investigated as alternatives to dispersions of metal nanoparticles in order to avoid clustering and homogeneity/reproducibility issues. In this paper, several samples of Au-coated ZnO nanoarrays are adopted as SERS substrates in order to investigate the molecular sensing capacity for methylene blue (MB) molecules. Self-forming ZnO nanoarrays were grown on both c-sapphire and silicon substrates by pulsed laser deposition. The nanoarrays were then coated with 30 nm of gold using thermal evaporation and the SERS signals of MB functionalized samples were obtained with a Raman microspectrometer. The ratio of SERS intensity to that of an MB functionalized glass substrate (_ISERS/I_Raman) was calculated based on the averaged SERS signals. A relatively good within-wafer homogeneity of the enhancement effect was found with I_SERS/I_Raman values as high as 64.2 for Au-coated nano ZnO grown on silicon substrates. The experimental results show that the Au-coated ZnO nanoarrays can be excellent SERS substrates for molecular/chemical analyte sensing.

Citation Download Citation

Feng Tang, Pierre-Michel Adam, David J. Rogers, Vinod E. Sandana, Philippe Bove, and Ferechteh H. Teherani "Sensing based on surface-enhanced Raman scattering using self-forming ZnO nanoarrays coated with gold as substrates", Proc. SPIE 10533, Oxide-based Materials and Devices IX, 105331F (27 March 2018); https://doi.org/10.1117/12.2302741

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KEYWORDS

Zinc oxide

Raman spectroscopy

Gold

Silicon

Molecules

Surface enhanced Raman spectroscopy

Thin films

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