Ag nanoclusters on ZnO nanodome array as hybrid SERS-active substrate for trace detection of malachite green

Kundan Sivashanmugan, Jiunn Der Liao, Bernard Haochih Liu, Chih Kai Yao, Shyh Chyang Luo

Research output: Contribution to journalArticlepeer-review

64 Citations (Scopus)

Abstract

Ag nanoclusters (NCs) were deposited on a focused ion beam (FIB)-fabricated ZnO nanodome (ND) to create a hybrid metal-semiconductor nanosystem for sensing extremely low concentrations of target species. The Ag NCs were uniformly distributed on the top and side surfaces of the ZnO ND. The surface-enhanced Raman scattering (SERS) effect of Ag NCs on ZnO ND was correlated with the coupling density of Ag NCs upon ZnO NDs with an optimized enhancement factor of 106. The improved SERS effect is attributed to the generation of strong local electromagnetic fields induced by the NCs on NDs and intra-NC interactions. In addition, the hybrid nanosystem was found to distinguish malachite green with good reproducibility over a wide range of concentrations down to the single-molecule detection limit (i.e., 10-17 M). This unique metal-semiconductor hybrid nanosystem is advantageous for the formation of Raman signal polarization among the excitation laser, nanostructure, and target species with high sensitivity and selectivity and is thus suitable for the trace detection of various target species.

Original languageEnglish
Pages (from-to)430-436
Number of pages7
JournalSensors and Actuators, B: Chemical
Volume207
Issue numberPart A
DOIs
Publication statusPublished - 2015 Feb

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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