Response characteristics of hydrogen gas sensor with porous piezoelectric poly(vinylidene fluoride) film

Yuji Imai, Daisuke Tadaki, Teng Ma, Yasuo Kimura, Ayumi Hirano-Iwata, Michio Niwano

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Previously, we have proposed a new type of organic hydrogen gas sensor in which a β-phase poly(vinylidene fluoride) (PVDF) film is coated with thin films of palladium (Pd) on both sides. Volume expansion of the Pd thin film caused by uptake of hydrogen is monitored by a capacitance change of the piezoelectric PVDF thin film. The β-phase PVDF film was synthesized from α-phase PVDF powder by using a wet process that we developed. In this study, we have examined the microscopic structure of the β-phase PVDF films and investigated the response characteristics of the sensors: response at hydrogen exposure, detection sensitivity, recovery time and effect of humidity. We find that the PVDF film has the porous structure consisting of micro-scaled grains of PVDF and demonstrates that the response characteristics depend on the structure of the PVDF films. We propose a simple simulation model to get insight into the observed response characteristics. In the model, it is assumed that PVDF micro-grains expand and shrink one by one while exposing to hydrogen and air (or oxygen), respectively. The simulation explains the basic response characteristics of the sensor.

Original languageEnglish
Pages (from-to)479-489
Number of pages11
JournalSensors and Actuators, B: Chemical
Volume247
DOIs
Publication statusPublished - 2017

Keywords

  • Hydrogen gas sensor
  • Pd film
  • Piezoelectric PVDF film
  • Porous structure
  • Response characteristics
  • Simulation

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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