Surface-enhanced Raman Spectroscopy for Versatile in situ Measurements of Local pH near Electrode Surface

Kohei Ide, Masahiro Kunimoto, Satoru Yoshida, Masahiro Yanagisawa, Takayuki Homma*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We designed an in situ surface-enhanced Raman spectroscopy (SERS) system to detect pH change near the electrode surface. An optically transparent substrate covered with Ag nanoparticles (NPs) that induce SERS was positioned vertically to the electrode. A probe molecule that protonates/deprotonates according to the change in pH of surroundings were distributed nearby the NPs, so that the SERS spectrum of the probe indicated the pH changes in the vertical direction to the electrode due to hydrogen consumption. Flexible choices of probe molecules allow the system to be versatile. The system operated effectively in Ni electrodeposition as a case example.

Original languageEnglish
Pages (from-to)1682-1689
Number of pages8
JournalElectroanalysis
Volume34
Issue number11
DOIs
Publication statusPublished - 2022 Nov

Keywords

  • Electrochemistry
  • Interfaces
  • Local pH analysis
  • Nanoparticles
  • Surface-enhanced Raman scattering (SERS)

ASJC Scopus subject areas

  • Analytical Chemistry
  • Electrochemistry

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