Nanoscale Pt thin film sensor for accurate detection of ppm level hydrogen in air at high humidity

Takahisa Tanaka, Shinsuke Hoshino, Tsunaki Takahashi, Ken Uchida

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Hydrogen is an important biomarker for the human digestive system. However, accurate detection of ppm-level hydrogen in breath is difficult due to the competing detection of high concentration water. We fabricated Pt thin films that respond to hydrogen in air at concentrations as low as 500 ppb. In both dry and humid air, these films have almost identical response to hydrogen, i.e., their resistance decreases linearly with increasing hydrogen concentration regardless of relative humidity. Even at high relative humidity, these Pt thin films can detect ppm-level hydrogen. Furthermore, it was strongly suggested that these films can be applied to low-level hydrogen in the air expired by a healthy human. Based on the chemical kinetics, namely the adsorption and desorption of hydrogen and oxygen, the sensor response is quantitatively described by relating the hydrogen surface coverage to the magnitude of electron scattering at the Pt surface. The proposed model successfully reproduces the effects of hydrogen concentration and time on the sensor response, particularly at hydrogen concentrations below 20 ppm. Based on this model, these Pt thin film sensors have the potential to detect 1 ppm hydrogen in expired air within 30 s.

Original languageEnglish
Pages (from-to)913-919
Number of pages7
JournalSensors and Actuators, B: Chemical
Volume258
DOIs
Publication statusPublished - 2018 Apr 1

Fingerprint

humidity
Hydrogen
Atmospheric humidity
Thin films
sensors
air
Sensors
hydrogen
thin films
Air
expired air
digestive system
Digestive system
Electron scattering
biomarkers
Biomarkers
Reaction kinetics
Desorption
electron scattering
reaction kinetics

Keywords

  • Adsorption
  • Humidity
  • Hydrogen
  • Platinum
  • Scattering
  • Sensor

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

Cite this

Nanoscale Pt thin film sensor for accurate detection of ppm level hydrogen in air at high humidity. / Tanaka, Takahisa; Hoshino, Shinsuke; Takahashi, Tsunaki; Uchida, Ken.

In: Sensors and Actuators, B: Chemical, Vol. 258, 01.04.2018, p. 913-919.

Research output: Contribution to journalArticle

Tanaka, Takahisa ; Hoshino, Shinsuke ; Takahashi, Tsunaki ; Uchida, Ken. / Nanoscale Pt thin film sensor for accurate detection of ppm level hydrogen in air at high humidity. In: Sensors and Actuators, B: Chemical. 2018 ; Vol. 258. pp. 913-919.
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