Improved stabilities on surface-enhanced Raman scattering-active Ag/Al 2O3 films on substrates

Fu Der Mai, Kuang Hsuan Yang, Yu Chuan Liu, Ting Chu Hsu

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

As is shown in the literature, surface-enhanced Raman scattering (SERS)-active Ag films obtained by the salting-out of Ag colloids from solutions with some salts, are popularly used to examine the structure of analytes. SERS-active Ag nanoparticles (NPs) demonstrate more significant SERS effects than Au NPs, however, problems regarding the stabilities of SERS-active Ag NPs remain to be overcome. In this work, Ag/Al2O3 colloids were prepared in 0.1 M HNO3 solutions containing Al2O 3 NPs with higher heat capacity by sonoelectrochemical methods. SERS-active Ag/Al2O3 films deposited on glass slides were prepared by the addition of a saturated NaCl solution in the prepared Ag/Al 2O3 colloids-containing solution. In an acceptable sacrifice of Raman intensity by ca. 30% magnitude, the prepared Ag/Al 2O3 films markedly improved thermal stability by raising the operation temperature over 100 °C, compared to Ag films. Meanwhile, aging of SERS enhancement capability in an atmosphere of relative humidity (RH) of 50% and 20% (v/v) O2 at 30 °C is significantly depressed using Ag/Al2O3 films.

Original languageEnglish
Pages (from-to)5906-5912
Number of pages7
JournalAnalyst
Volume137
Issue number24
DOIs
Publication statusPublished - Dec 21 2012

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ASJC Scopus subject areas

  • Analytical Chemistry
  • Spectroscopy
  • Electrochemistry
  • Biochemistry
  • Environmental Chemistry

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