Nanovoids embedded in FIB-fabricated Au/Ag nanorod arrays for ultrasensitive SERS-active substrate

Kundan Sivashanmugan, Jiunn-Der Liao, Chih Kai Yao

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

A focused ion beam (FIB) was employed to fabricate Au/Ag nanorod (NR) arrays (fibAu/Ag-NR). After an annealing process, the fibAu/Ag-NR exhibited a Au/Ag diffused structure or nanovoids (NVs) embedded in NRs preferentially at the Au/Ag interface. With crystal violet (CV) used as the probe molecule, NV-Au/Ag-NRs were found to show an increase in the effect of surface-enhanced Raman scattering. An enhancement of 7 orders of magnitude was obtained at low concentrations of CV. It is most likely that the embedded NVs increase the effective surface area for the interactions between CV molecules and laser light. A strong electromagnetic field effect is presumably generated inside NVs and around NRs.

Original languageEnglish
Article number092202
JournalApplied Physics Express
Volume7
Issue number9
DOIs
Publication statusPublished - 2014 Sep 1

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

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