University of Illinois Urbana-Champaign

Electrochemical surface-enhanced Raman spectra and plasmon-driven photoelectrochemical reaction of p-aminothiophenol on silver electrode of nanostructures

Wu, De-Yin

Content Files
1343587.pptx
3661.pdf

Permalink

https://hdl.handle.net/2142/104527

Description

Title
Electrochemical surface-enhanced Raman spectra and plasmon-driven photoelectrochemical reaction of p-aminothiophenol on silver electrode of nanostructures
Author(s)
Wu, De-Yin
Contributor(s)
  • Tian, Zhong-Qun
  • Zhang, Meng
Issue Date
2019-06-20
Keyword(s)
Spectroscopy as an analytical tool
Date of Ingest
  • 2019-07-15T22:17:06Z
  • 2020-01-25T19:31:30Z
Abstract
Surface plasmon resonance (SPR) of noble metal nanoparticles (NPs) provides a pathway to efficiently absorb and confine light to nanoscale surface electrons, thereby bridging photonics and photoelectrochemistry. This not only produces the giant Raman intensity enhancement in surface-enhanced Raman spectroscopy (SERS), but also results in plasmon-driven chemical reaction on metal nanostructures. We have studied the surface-enhanced Raman spectra of p-aminothiophenol adsorbed on silver electrodes of nanostructures. In this work, we studied SPR-enhanced photoelectrochemical synergistic reactions by SERS to improve chemical reaction activity and examine changes in reaction selectivity. We first demonstrate that hot carriers arising from SPR decay contribute to the surface catalytic coupling reaction of PATP on a silver NP electrode. Then, by using potential step electrochemical SERS, we further inspect the kinetics of the surface catalytic coupling reaction by monitoring the time-dependent SERS intensity of the characteristic band at 1436 cm$^{-1}$, which can be attributed to the stretching vibration of the N=N double bond of p,p’-dimercaptoazobenzene (DMAB). When synergistically combined with the modulation of pH at electrochemical interfaces, SPR-enhanced photoelectrochemical reactions can be further gain reaction efficiency and selectivity for the formation of DMAB and other surface species at higher potentials. The electrochemical SPR effect provides a viable approach for studying the photoelectrochemistry through combining SERS at the interface of nanoparticle-modified metal electrodes and electrolytes.
Publisher
International Symposium on Molecular Spectroscopy
Type of Resource
text
Genre of Resource
Conference Paper / Presentation
Language
eng
Permalink
http://hdl.handle.net/2142/104527
DOI
https://doi.org/10.15278/isms.2019.RL10
Copyright and License Information
Copyright 2019 De-Yin Wu

Owning Collections

Abstracts & Presentations - 2019 International Symposium on Molecular Spectroscopy PRIMARY