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Related Experiment Video

Updated: May 22, 2025

Fabrication and Characterization of Thickness Mode Piezoelectric Devices for Atomization and Acoustofluidics
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High-Performance Piezoelectric Micro Diaphragm Hydrogen Sensor.

Jihang Liu1, Doris Keh Ting Ng1, Yul Koh1

  • 1Institute of Microelectronics (IME), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-02, Singapore 138634, Republic of Singapore.

ACS Sensors
|March 13, 2025
PubMed
Summary

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This summary is machine-generated.

A new piezoelectric micro diaphragm (PMD) hydrogen (H2) sensor offers high sensitivity and a compact size. This novel H2 sensor achieves an excellent figure of merit for clean energy applications.

Area of Science:

  • Materials Science
  • Chemical Engineering
  • Electrical Engineering

Background:

  • Growing adoption of hydrogen (H2) as a clean energy carrier necessitates advanced safety and process monitoring.
  • Existing resonant frequency-based H2 sensors struggle to balance high sensitivity, low operating frequency, miniaturization, and a high figure of merit (FOM).

Purpose of the Study:

  • To develop a novel piezoelectric micro diaphragm (PMD) H2 sensor with an enhanced figure of merit (FOM).
  • To address the limitations of current H2 sensors in achieving high sensitivity, low operating frequency, and miniaturization simultaneously.

Main Methods:

  • Integration of a PMD resonator with a palladium (Pd) sensing layer operating on a stress-based mechanism.
  • Characterization of sensor performance across varying Pd thicknesses (40-125 nm) and piezoelectric stack covering ratios (50% and 70%).
Keywords:
hydrogen sensorpalladium sensing layerpiezoelectric micro diaphragmresonant gas sensorresponse stress-based

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Last Updated: May 22, 2025

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Main Results:

  • Achieved an unprecedented FOM exceeding 10^4.
  • Demonstrated high sensitivity (18.5 kHz/% H2) at a low operating frequency (150 kHz).
  • Exhibited minimal cross-sensitivity to humidity and common gases, with a compact form factor (600 μm) suitable for IC integration.

Conclusions:

  • The novel PMD H2 sensor represents a significant advancement in resonant frequency-based H2 sensing.
  • Offers superior sensitivity, compact size, and robust performance for diverse H2 detection and monitoring applications.
  • The stress-based mechanism provides an alternative to traditional mass-loading principles for H2 sensing.