PH measurements with ZnO based surface acoustic wave resonator

Xiaotun Qiu, Rui Tang, Shih Jui Chen, Hao Zhang, Wei Pang, Hongyu Yu

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

This paper investigated pH measurements using ZnO based surface acoustic wave resonator (SAW). The resonant frequency of the SAW decreased as pH value changed from 7 to 2 (acid region) or from 7 to 12 (alkaline region). The detection limits were 0.03 and 0.02 pH change, respectively, which were comparable to commercial pH meters. The interaction between hydronium (H 3O+) or hydroxide (OH-) and ZnO was proposed to be responsible for the frequency drop. Both hydronium and hydroxide can increase the conductivity of the ZnO film, resulting in the resonant frequency decrease due to the acoustoelectric effect.

Original languageEnglish (US)
Pages (from-to)488-490
Number of pages3
JournalElectrochemistry Communications
Volume13
Issue number5
DOIs
StatePublished - May 2011

Keywords

  • Acoustoelectric effect
  • Surface acoustic wave resonator
  • ZnO
  • pH

ASJC Scopus subject areas

  • Electrochemistry

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