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Wireless Wearable MOF-Based NH3 Gas Sensor Patch with a Zeolite Overlayer for Suppressing NO2 Interference.

Yueru Jiang1, Yu Wang1, Tianshuang Wang1,2

  • 1State Key Laboratory of Integrated Optoelectronics (JLU Region), College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, China.

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Summary

This study introduces a novel wireless, battery-free wearable gas sensor patch. The flexible metal-organic framework (MOF) sensor patch effectively detects ammonia (NH3) without interference from nitrogen dioxide (NO2).

Keywords:
NH3 detectioninductance-capacitance resonance circuitmetal-organic-frameworkwireless wearable sensorzeolite

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Sensor Technology

Background:

  • Flexible metal-organic framework (MOF) films are advancing wearable gas sensors.
  • Current MOF sensors face challenges with interference, power consumption, and comfort for skin applications.

Purpose of the Study:

  • To develop a wireless, battery-free wearable gas sensor patch for skin-interfaced applications.
  • To overcome mutual interference issues in existing MOF-based sensors.

Main Methods:

  • Fabrication of a bilayer flexible film using a 2D bimetallic Cu/Co-HHTP conjugate MOF (c-MOF) sensing layer and a Pd/SSZ-13 zeolite overlayer.
  • Utilizing an inductance-capacitance (LC) resonator for wireless sensing.
  • Implementing a zeolite overlayer to selectively adsorb NO2, preventing interference with NH3 detection.

Main Results:

  • The wireless sensor patch demonstrated linear and interference-resistant detection of ammonia (NH3) in the presence of nitrogen dioxide (NO2).
  • The device maintained excellent mechanical flexibility, cyclic stability, and negligible baseline drift, with <6.2% response attenuation after repeated bending.
  • A skin-adherent, wireless, passive sensing system was validated for continuous NH3 monitoring in complex environments.

Conclusions:

  • The proposed wireless wearable MOF-based sensor patch offers a transformative solution for wearable applications, addressing limitations of current technologies.
  • Further optimization is needed to improve device performance under high-humidity conditions.