Nanostructured Ag surface fabricated by femtosecond laser for surface-enhanced Raman scattering

Han Wei Chang, Yu Chen Tsai*, Chung-Wei Cheng, Cen Ying Lin, Yen Wen Lin, Tzong Ming Wu

*Corresponding author for this work

Research output: Contribution to journalArticle

30 Scopus citations

Abstract

Femtosecond laser was employed to fabricate nanostructured Ag surface for surface-enhanced Raman scattering (SERS) application. The prepared nanostructured Ag surface was characterized by field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The FESEM images demonstrate the formation of nanostructure-covered femtosecond laser-induced periodic surface structure, also termed as ripples, on the Ag surface. The AFM images indicate that the surface roughness of the produced nanostructured Ag substrate is larger than the untreated Ag substrate. The XRD and XPS of the nanostructured Ag surface fabricated by femtosecond laser show a face centered cubic phase of metallic Ag and no impurities of Ag oxide species. The application of the produced nanostructured Ag surface in SERS was investigated by using rhodamine 6G (R6G) as a reference chemical. The SERS intensity of R6G in aqueous solution at the prepared nanostructured Ag surface is 15 times greater than that of an untreated Ag substrate. The Raman intensities vary linearly with the concentrations of R6G in the range of 10-8-10-4M. The present methodology demonstrates that the nanostructured Ag surface fabricated by femtosecond laser is potential for qualification and quantification of low concentration molecules.

Original languageEnglish
Pages (from-to)305-308
Number of pages4
JournalJournal of Colloid And Interface Science
Volume360
Issue number1
DOIs
StatePublished - 1 Aug 2011

Keywords

  • Ag nanostructure
  • Femtosecond laser
  • R6G
  • SERS

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