Room-temperature polymer-coated supersonic cluster beam deposited ZnO film for O2gas and dissolved O2sensing

Man Hon Wong, Ngai Hang Ng, Meng Zhao, Ka Seng Lau, Hau Chung Man, Jeffery T. Cheung, Chung Wo Ong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

3 Citations (Scopus)

Abstract

Room-temperature dynamic light-enhanced galvanometric response of supersonic cluster beam deposited (SCBD) zinc oxide (ZnO) films to oxygen (O2) was investigated. The photocurrent was recorded when above-bandgap light is turned on, being maintained and turned off. Measurements were done in dry gaseous environment, and repeated in dry and wet gaseous environment after adding a water-proof superhydrophobic polymer coating on top. A dissolved oxygen sensor prototype made of a polymer-coated ZnO film was fabricated to detect oxygen content in water. A model involving photo generation and recombination of electron-hole pairs, trapping and release of conduction electrons associated with sorption-desorption processes of oxygen was proposed. A practical method for determining the O2concentration in the media based on fitting parameters to the dynamic photocurrent was tested.
Original languageEnglish
Pages (from-to)1068-1075
Number of pages8
JournalSensors and Actuators, B: Chemical
Volume251
DOIs
Publication statusPublished - 1 Nov 2017

Keywords

  • Dissolved oxygen detection
  • O sensor 2
  • Porous ZnO films
  • UV-assisted photocurrent

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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