Highly sensitive isoprene gas sensor using Au-loaded pyramid-shaped ZnO particles

Noriko Saito, Hajime Haneda, Ken Watanabe, Kengo Shimanoe, Isao Sakaguchi

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

Highly sensitive sensors to detect small amounts of gases are expected to be used for monitoring air quality and analyzing breath for medical diagnosis. We report a highly sensitive isoprene gas sensor using Au-loaded pyramid-shaped ZnO particles. The pyramid-shaped ZnO particles with (0001) base and {10 1¯1¯} six side surfaces were synthesized solvothermally. Loading of 0.5 % Au nanoparticles successfully increased the sensor response. The response value (the resistivity ratio in air and isoprene gas) to 50 ppb isoprene gas was 42 at 350 °C in dry air, which is remarkably higher than that of previously reported sensors of metal-oxide semiconductors. Under 80 % relative humidity, the response value to 50 ppb was 4.8. The isoprene concentration dependence of the sensor response implied that 10 ppb can be detected with a response value of 1.4 and that diagnosis of liver diseases and sleep state is possible. Enhanced selectivity compared to acetone, ethanol and hydrogen was confirmed in Au-doped samples.

Original languageEnglish
Article number128999
JournalSensors and Actuators, B: Chemical
Volume326
DOIs
Publication statusPublished - Jan 1 2021

All Science Journal Classification (ASJC) codes

  • 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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