Combustion-type H2 gas sensor using a PTC thermistor based on Bi, Na-Codoped BaTiO3 as a transducer

Naoki Tachibana, Masayoshi Yuasa, Tetsuya Kida, Noboru Yamazoe, Kengo Shimanoe

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We investigated the H2 sensing properties of a catalytic combustion-type hydrogen sensor using a BaTiO3-based positive temperature coefficient (PTC) thermistor as a transducer. In this sensor, catalytic combustion of H2 on Pt electrodes or a catalyst layer induces a remarkable change in the electric resistance as a sensor signal when the operating temperature is set near the Curie temperature of BaTiO3 (120 °C). However, the sensor response to H2 is relatively low at lower H2 concentrations because of lower combustion efficiency near 120 °C. In this study, Ba0.9(Bi0.5Na 0.5)0.1Ti0.999Nb0.001O3 (BNN-BT) with a higher Curie temperature (146 °C) was used as a transducer to increase the operating temperature and thus improve the sensor response. The sensor using BNN-BT and a Pt/SiO2 combustion catalyst showed improved sensor responses particularly at lower H2 concentrations. It also showed good response and recovery behaviors in response to 100-1000 ppm H 2 in air.

Original languageEnglish
Pages (from-to)21-25
Number of pages5
JournalSensor Letters
Volume9
Issue number1
DOIs
Publication statusPublished - Dec 15 2011

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Positive temperature coefficient
Thermistors
thermistors
Chemical sensors
Transducers
transducers
sensors
Sensors
coefficients
gases
Curie temperature
temperature
operating temperature
low concentrations
combustion efficiency
catalysts
Catalysts
recovery
Recovery
Hydrogen

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

Cite this

Combustion-type H2 gas sensor using a PTC thermistor based on Bi, Na-Codoped BaTiO3 as a transducer. / Tachibana, Naoki; Yuasa, Masayoshi; Kida, Tetsuya; Yamazoe, Noboru; Shimanoe, Kengo.

In: Sensor Letters, Vol. 9, No. 1, 15.12.2011, p. 21-25.

Research output: Contribution to journalArticle

Tachibana, Naoki ; Yuasa, Masayoshi ; Kida, Tetsuya ; Yamazoe, Noboru ; Shimanoe, Kengo. / Combustion-type H2 gas sensor using a PTC thermistor based on Bi, Na-Codoped BaTiO3 as a transducer. In: Sensor Letters. 2011 ; Vol. 9, No. 1. pp. 21-25.
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