|Title:||Anti-reflection textured structures by wet etching and island lithography for surface-enhanced Raman spectroscopy||Authors:||Chao B.-K.
|Keywords:||Anti-reflection;Finite-difference time-domain method;Island lithography;Nanostructure;Surface-enhanced Raman scattering;Textured substrate;Wet etching||Issue Date:||2015||Journal Volume:||357||Start page/Pages:||615-621||Source:||Applied Surface Science||Abstract:||
A high surface area and low reflection textured surface-enhanced Raman scattering (SERS) substrate with plasmonic gold nanodroplets fabricated by wet etching and island lithography was reported in the present study. Specifically, four textured substrates, planar, pyramid, nanopillar, and nanopillar-on-pyramid, were fabricated. The fabricated structures were simulated using the finite-difference time-domain method and the results agreed with the reflection and dark-field scattering measurements. Although the SERS signals varied in different measured regions because of the random nanostructure, the SERS substrates with nanopillar-on-pyramid structure always have the stronger enhancement factor than the SERS substrates with only pyramids or nanopillars. Based on the atomic force microscope and reflection measurements, the nanopillar-on-pyramid structure provided a large surface area and multiple reflections for SERS enhancement, which was about 3 orders of magnitude larger than that of the planar substrate. Our results can be applied to fabricate the inexpensive, large surface area, and high SERS enhancement substrates. ? 2015 Elsevier B.V. All rights reserved.
|Appears in Collections:||材料科學與工程學系|
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