Wide-range and high-accuracy wireless sensor with self-humidity compensation for real-time ammonia monitoring

Wen Lv, Jianhua Yang (), Qingda Xu, Jaafar Abdul-Aziz Mehrez, Jia Shi, Wenjing Quan, Hanyu Luo, Min Zeng, Nantao Hu, Tao Wang, Hao Wei and Zhi Yang ()
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Wen Lv: Shanghai Jiao Tong University
Jianhua Yang: Shanghai Jiao Tong University
Qingda Xu: Shanghai Jiao Tong University
Jaafar Abdul-Aziz Mehrez: Shanghai Jiao Tong University
Jia Shi: Shanghai Jiao Tong University
Wenjing Quan: Shanghai Jiao Tong University
Hanyu Luo: Shanghai Jiao Tong University
Min Zeng: Shanghai Jiao Tong University
Nantao Hu: Shanghai Jiao Tong University
Tao Wang: Shanghai Jiao Tong University
Hao Wei: Shanghai Jiao Tong University
Zhi Yang: Shanghai Jiao Tong University

Nature Communications, 2024, vol. 15, issue 1, 1-13

Abstract: Abstract Real-time and accurate biomarker detection is highly desired in point-of-care diagnosis, food freshness monitoring, and hazardous leakage warning. However, achieving such an objective with existing technologies is still challenging. Herein, we demonstrate a wireless inductor-capacitor (LC) chemical sensor based on platinum-doped partially deprotonated-polypyrrole (Pt-PPy+ and PPy0) for real-time and accurate ammonia (NH3) detection. With the chemically wide-range tunability of PPy in conductivity to modulate the impedance, the LC sensor exhibits an up-to-180% improvement in return loss (S11). The Pt-PPy+ and PPy0 shows the p-type semiconductor nature with greatly-manifested adsorption-charge transfer dynamics toward NH3, leading to an unprecedented NH3 sensing range. The S11 and frequency of the Pt-PPy+ and PPy0-based sensor exhibit discriminative response behaviors to humidity and NH3, enabling the without-external-calibration compensation and accurate NH3 detection. A portable system combining the proposed wireless chemical sensor and a handheld instrument is validated, which aids in rationalizing strategies for individuals toward various scenarios.

Date: 2024
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DOI: 10.1038/s41467-024-51279-9

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