Surface roughness-correlated SERS effect on Au island-deposited substrate

Sheng Uei Fang, Ching Ling Hsu, Ting Chu Hsu, Ming Yu Juang, Yu Chuan Liu

研究成果: 雜誌貢獻文章同行評審

15 引文 斯高帕斯(Scopus)

摘要

Evaporation and sputtering-deposition of noble metal films on substrates are two most popular and easiest methods for creating stable surface-enhanced Raman scattering (SERS)-active metal nanoparticles (NPs). However, intrinsically low SERS effect and unclearly inherent relationship between SERS effect and surface roughness of created Au NPs make SERS-related applications are limited. Here, we present the enhanced SERS effect observed on Au nanoislands (AuNIs)-deposited substrates prepared by thermal evaporation and followed by post-annealing treatment (PAT). Experimental results indicate that the SERS intensity of Rhodamine 6G (R6G) adsorbed on AuNIs, corresponding to average particle diameter of ca. 220 nm and to mean roughness (Ra) of 50 nm, can be increased by one order of magnitude after PAT at 700 °C. Meanwhile, the AuNIs (annealed at 700 °C)-deposited silicon substrate demonstrates a large enhancement factor (EF) of 2.2 × 107. The relative standard deviation is ca. 7% in SERS measurements. In addition, detailed relationships of Ra derived from analysis of atomic force microscopy (AFM) and SERS effect are correlated for metal particles smaller and larger than 300 nm.

原文英語
頁(從 - 到)127-133
頁數7
期刊Journal of Electroanalytical Chemistry
741
DOIs
出版狀態已發佈 - 三月 15 2015

ASJC Scopus subject areas

  • 分析化學
  • 化學工程 (全部)
  • 電化學

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