High sensitivity MEMS capacitive hydrogen sensor with inverted T-shaped electrode and ring-shaped palladium alloy for fast response and low power consumption

Hiroaki Yamazaki, Yumi Hayashi, Kei Masunishi, Daiki Ono, Tamio Ikehashi

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We report a novel palladium (Pd)-based micro electro-mechanical system (MEMS) capacitive hydrogen gas sensor that has an inverted T-shaped electrode and a ring-shaped Pd alloy layer, which enable high sensitivity and low power consumption. Thanks to these structures, deformation of the membrane as a result of hydrogen absorption can be efficiently transduced to capacitance change. The capacitance change of the proposed sensor is found to be three times larger than that of the conventional structure. Prototype sensors were fabricated by a CMOS-compatible surface micromachining process. The proposed sensor offers a broad design window for attaining high sensitivity. Finally, we show that our sensor provides fast response, is hysteresis-free, and has excellent hydrogen selectivity characteristics despite not employing a heater by using PdCuSi metallic glass.

Original languageEnglish
Article number094001
JournalJournal of Micromechanics and Microengineering
Volume28
Issue number9
DOIs
Publication statusPublished - 2018 May 21
Externally publishedYes

Keywords

  • capacitor
  • hydrogen sensor
  • MEMS
  • metallic glass
  • palladium alloy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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