A Gas-Sensitive SPIM Sensor for Detection of Ethanol Using SnO2 as Sensing Element

Mengyun Wang, Hoang A. Truong, Carl Frederik Benedikt Werner, Ko ichiro Miyamoto, Tatsuo Yoshinobu

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


In this study, a gas-sensitive scanning photo-induced impedance microscopy (SPIM) sensor using tin dioxide (SnO2) as sensing element is proposed, which detects the local impedance change on the sensor surface in response to ethanol vapor. The impedance change of the SnO2 film is detected by monitoring the AC photocurrent signal induced by a laser beam. This measurement can be done in a spatially resolved manner by using a scanning laser beam and two-dimensional maps are obtained thanks to the light-addressability of SPIM. This technique is expected to be applied to the visualization of gas distributions on the sensing surface.

Original languageEnglish
Article number1800766
JournalPhysica Status Solidi (A) Applications and Materials Science
Issue number12
Publication statusPublished - 2019 Jun 19


  • SnO
  • ethanol
  • gas sensors
  • scanning photo-induced impedance microscopy
  • visualization

ASJC Scopus subject areas

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


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