Fei Gao,Zhe Yi Li,Zhao Qi Li,Qiao Nan Wang,Bi Cheng Li,Lei Wang,Meng Zhao,Jing Chang Nan,Cong Wang
This paper presents a novel high sensitivity microwave sensor for low-concentration acetone gas detection. The electrically coupled resonator loaded with an interdigital capacitor (ECR-IDC) structure is the sensing area, with a maximum electric field strength of 3.71 × 10
5
V/m. The SnO
2
-MXene nanocomposites with different MXene doping ratios were prepared using an ultrasound-assisted dispersion method, which significantly changed the conductivity of the gas-sensitive material. Experimental results revealed that the developed sensor exhibited a high sensitivity of 51.7 mdB/ppm and excellent linearity in the detection range of 1-20 ppm, attributed the heterojunction like structure of the SnO
2
-MXene nanocomposites. The introduction of MXene induced a decrease in conductivity, which is beneficial for microwave sensing, and simultaneously increased the active sites of the composite for acetone binding, finally improving the sensitivity of the microwave sensors. The demonstrated high performance of the developed sensor validates its potential in breath analysis, towards future applications in designing novel healthcare devices.
Jie Wei,En-Kang Wu,Ji-Hao Zhang,Zhen Zhang,Xiao-Cong Tang,Tian Qiang,Yong-Woo Jang,Xiao-Feng Gu,Meng Zhao,Svetlana von Gratowski,Jun-Ge Liang,Ming-Yang Yan,Cong Wang
Acetone sensors continue to command significant attention as a robust platform for emissions control, industrial safety monitor, and diagnostic analysis of human exhaled gas for diabetes monitoring. This study presents the design and fabrication of an ultra-narrowband, interdigital capacitor (IDC)-based three-level split ring resonator (TSRR) microwave gas sensor for rapid acetone detection. MXene-TiO 2 composites with varying mass ratios were deposited onto the resonator surface to evaluate the gas-sensitive properties of TiO 2 /MXene materials across acetone concentrations of 10–500 ppm. Results demonstrate that the microwave acetone sensor incorporating the TiO 2 /MXene (3 wt%) composite exhibits exceptional performance: high sensitivity (1544 mdB/ppm), rapid response and recovery durations (130 s and 140 s, respectively), superior selectivity, and excellent stability under high-humidity conditions—significantly surpassing existing microwave gas sensors. Furthermore, the gas-sensing mechanism was elucidated through impedance-matching circle diagrams corresponding to varying acetone concentrations. MXene materials, renowned for their expansive specific surface area, exhibit considerable promise in gas sensing applications, particularly for room-temperature acetone detection with high selectivity and sensitivity extending to ppb concentrations. This investigation introduces a novel paradigm for room-temperature acetone gas detection, as evidenced by the development of triboelectric plasma-regulated high-sensitivity sensors.
危险品化学品经营许可证（带存储）