Mechanistic study on reduction reaction of nitro compounds catalyzed by gold nanoparticles using in situ SERS monitoring

Qianling Cui, Alexey Yashchenok, Lidong Li, Helmuth Möhwald, Matias Bargheer

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Surface-enhanced Raman scattering (SERS) spectroscopy has emerged in recent years as a promising and powerful technique to investigate the reaction mechanism of heterogeneous catalysis. In this work, the reduction reaction of 4-nitrothiophenol (4-NTP) to its corresponding amino derivate catalyzed by gold took place between the gold nanoshell and gold nanostar. Due to the strong binding of thiol group to the gold surface, the molecular configuration of 4-NTP was fixed with NO2 group towards outside. The direct contact of NO2 group with catalytic gold nanostars ensured the reduction reaction went smoothly, which was monitored by SERS spectroscopy. The NO2 vibration Raman band showed a unique blue-shift without any appearance of dimerization product, indicating this catalytic reaction might follow a monomolecular mechanistic pathway.

Original languageEnglish
Pages (from-to)108-113
Number of pages6
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume470
DOIs
Publication statusPublished - 1 Apr 2015
Externally publishedYes

Keywords

  • Gold nanoparticles
  • Heterogeneous catalysis
  • Monomolecular reaction
  • Reaction mechanism
  • Surface-enhanced Raman scattering

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