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Low-power biomimetic ionic thermoelectric device for multi-gas olfaction.
Gongze Liu1, Cheng Chi2,3, Jiacheng Ji1
1Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Hong Kong 999077, China.
National Science Review
|June 25, 2026
Summary
Researchers developed a novel artificial olfactory system using the giant ionic-thermoelectric effect for efficient multi-gas sensing. This biomimetic device can detect and differentiate various gases simultaneously, overcoming limitations of traditional thermoelectric materials.
Area of Science:
- Materials Science
- Chemical Sensing
- Nanotechnology
Background:
- Growing demand for intelligent multi-gas sensing systems necessitates improved power efficiency.
- Conventional thermoelectric materials face limitations due to low thermopower-to-thermal conductivity (S/κ).
Purpose of the Study:
- To introduce an innovative gas sensing mechanism utilizing the giant ionic-thermoelectric effect.
- To demonstrate a high-performance, power-efficient artificial olfactory device capable of resolving mixed gas analytes.
Main Methods:
- Employing wafer-scale microfabrication technology to create a monolithic platform.
- Integrating multiple ionic-thermoelectric modules with narrow-bandpass optical filters for selective gas detection.
- Utilizing solid-state ionic polymers for enhanced thermoelectric properties.
Main Results:
- Demonstrated the first functional ionic-thermoelectric biomimetic olfactory device.
- Achieved a record responsivity of 2340 V/W, a 20-fold improvement over commercial detectors.
- Reported limits of detection of 1.42 ppm for CO2, 0.15 ppm for CH4, and 1.16 ppb for CO.
Conclusions:
- The giant ionic-thermoelectric effect offers a promising route for next-generation artificial olfactory systems.
- The developed device overcomes conventional limitations, enabling efficient and selective multi-gas sensing.
- This technology paves the way for advanced biomimetic sensing applications.
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