In situ SERS monitoring of photocatalytic organic decomposition using recyclable TiO2-coated Ag nanowire arrays

Zhi Yong Bao, Xin Liu, Jiyan Dai, Yucheng Wu, Yuen Hong Tsang, Dangyuan Lei

Research output: Journal article publicationJournal articleAcademic researchpeer-review

38 Citations (Scopus)

Abstract

Recently, semiconductor and noble metal complex nanomaterials have attracted ever-increasing attention because of the realization of multiple functionalities in a single entity. In this study, Ag-TiO2core-shell nanocomposites were synthesized by hydrolysis of butyl titanate on the surface of Ag nanowires. Due to efficient electron transfer at the Ag-TiO2interface, the as-prepared nanocomposites exhibit much higher photocatalytic activity than bare TiO2films, as demonstrated by the enhanced photodegradation rate of R6G and methyl blue molecules. In the meanwhile, such nanocomposites serve as a high-sensitivity surface-enhanced Raman scattering (SERS) substrate for in situ monitoring of the photocatalytic decomposition reaction, and the substrate is recyclable due to its self-cleaning function. Full-wave numerical calculations reveal that the improved photocatalysis and SERS efficiencies are attributed to the largely enhanced electromagnetic near-field in the nanocomposites. Our results point out that bifunctional semiconductor-metal hybrids hold great promise for simultaneously detecting and decomposing organic pollutants in the environment.
Original languageEnglish
Pages (from-to)351-357
Number of pages7
JournalApplied Surface Science
Volume301
DOIs
Publication statusPublished - 15 May 2014

Keywords

  • Finite-difference time-domain
  • Photodegradation
  • Self-cleaning
  • Surface-enhanced Raman scattering
  • Titanium dioxide

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

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