Abstract
This paper proposes a wireless passive gas sensor based on the principle of LC mutual coupling. After the acidification of the carbon nanotube (CNT), the in-situ polymerization of the aminobenzene monomers was conducted on the surface of the acidified CNT to form a sensitive material composed of a polyaniline/carbon nanotube (PANI/CNT) composite. The Advanced Design System (ADS) software was used for simulating and analyzing the designed structure, which obtained the various parameters of the structure. A lead-free aluminum paste was printed on an alumina ceramic substrate via the screen printing technique to form an inductor coil, before the gas sensitive material was applied to prepare a wireless passive gas sensor, consisting of a single-turn inductor and interdigitated electrodes on the base structure. Finally, an experimental platform was built to test the performance of the sensor. The sensitivity of the gas sensor is about 0.04 MHz/ppm in an atmosphere with a NH3 concentration of 300 ppm. The sensor was shown to have good repeatability and high stability over a long time period.
Highlights
In recent years, various modern facilities have improved the convenience of daily life
The PANI/carbon nanotube (CNT) (Polyaniline/Carbon Nanotube) composite with the advantages of simple preparation, cost-effectiveness and good stability can be used as a gas sensitive material to prepare a passive wireless gas sensor, which does not require a power supply internally
Polyaniline adhered to the surface of chemically acidified carbon nanotubes
Summary
Various modern facilities have improved the convenience of daily life. Reported that PANI was doped by plasma-enhanced chemical vapor deposition as measured by optical detection They found that the sensitivity and the concentration of ammonia in the concentration range of 92–4618 ppm have a logarithmic linear relationship. The PANI/CNT (Polyaniline/Carbon Nanotube) composite with the advantages of simple preparation, cost-effectiveness and good stability can be used as a gas sensitive material to prepare a passive wireless gas sensor, which does not require a power supply internally. It can be used under certain special circumstances, such as a closed environment and a high temperature environment
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