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Open Access Nano Express

Naturally inspired SERS substrates fabricated by photocatalytically depositing silver nanoparticles on cicada wings

Ichiro Tanahashi* and Yoshiyuki Harada

Author Affiliations

Nanomaterials and Microdevices Research Center, Osaka Institute of Technology, 5-16-1 Omiya, Asahi-ku, Osaka 535-8585, Japan

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Nanoscale Research Letters 2014, 9:298  doi:10.1186/1556-276X-9-298

Published: 12 June 2014

Abstract

Densely stacked Ag nanoparticles with an average diameter of 199 nm were effectively deposited on TiO2-coated cicada wings (Ag/TiO2-coated wings) from a water-ethanol solution of AgNO3 using ultraviolet light irradiation at room temperature. It was seen that the surfaces of bare cicada wings contained nanopillar array structures. In the optical absorption spectra of the Ag/TiO2-coated wings, the absorption peak due to the localized surface plasmon resonance (LSPR) of Ag nanoparticles was observed at 440 nm. Strong Surface-enhanced Raman scattering (SERS) signals of Rhodamine 6G adsorbed on the Ag/TiO2-coated wings were clearly observed using the 514.5-nm line of an Ar+ laser. The Ag/TiO2-coated wings can be a promising candidate for naturally inspired SERS substrates.

Keywords:
Silver nanoparticles; SERS; Localized surface plasmon resonance; Cicada; Wing