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An LC Passive Wireless Gas Sensor Based on PANI/CNT Composite.

Sanmin Shen1,2,3, Zhihong Fan4,5, Jiahao Deng6

  • 1School of Mechatronical Engineering, Beijing Institute of Technology, Beijing 100081, China. shensanming@nuc.edu.cn.

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|September 12, 2018
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Summary
This summary is machine-generated.

This study presents a wireless passive gas sensor using polyaniline/carbon nanotube composites for detecting ammonia. The novel sensor demonstrates good sensitivity and long-term stability.

Keywords:
LC mutual couplingNH3carbon nanotubesgas sensitive materialspolyanilinewireless passive gas sensor

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Chemical Sensing

Background:

  • Wireless passive sensors offer advantages in remote monitoring applications.
  • Carbon nanotube (CNT) and polyaniline (PANI) composites show promise for gas sensing due to their unique electrical properties.

Purpose of the Study:

  • To develop and characterize a wireless passive gas sensor utilizing a PANI/CNT composite material.
  • To investigate the sensor's performance in detecting ammonia (NH₃).

Main Methods:

  • Fabrication of a PANI/CNT composite sensitive material via in-situ polymerization on acidified CNTs.
  • Design and simulation of a wireless passive sensor structure using Advanced Design System (ADS) software.
  • Screen printing of an inductor coil on an alumina substrate and integration with interdigitated electrodes.

Main Results:

  • The wireless passive gas sensor exhibited a sensitivity of approximately 0.04 MHz/ppm for ammonia detection at 300 ppm.
  • The sensor demonstrated good repeatability and high long-term stability.
  • ADS simulations provided key structural parameters for sensor optimization.

Conclusions:

  • The developed wireless passive gas sensor based on PANI/CNT composite is effective for ammonia detection.
  • The sensor's robust performance indicates its potential for practical environmental monitoring applications.
  • The integration of LC mutual coupling principles with advanced materials offers a viable approach for wireless sensing.