Jia-Kang Wu, En-Kang Wu, Nam-Young Kim, Eun-Seong Kim, Xiao-Feng Gu, Jun-Ge Liang
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Experimental results indicate that the accumulated amount of acetone on the sensor surface is positively correlated with its response, with the maximum response of 3000 ppm acetone gas reaching 0.34 dB. Additionally, this study investigated the detection mechanism of the sensor after adding the sensitive material MXene and compared the performance of the sensor at different temperatures (-10 °C, 0 °C, and 60 °C). The results show that at -10 °C the sensor mainly captures acetone through physical adsorption, while at 25 and 60 °C, it primarily responds through chemical adsorption, with a maximum response of 0.29 dB. 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引用次数: 0
摘要
微波气体传感器因其在检测挥发性有机化合物(VOC)方面的高灵敏度和高选择性而备受关注。然而,传统的气体传感器通常依赖于敏感材料,这些材料会随着时间的推移而降解,并且容易受到环境的影响,从而影响其稳定性和准确性。本研究提出了一种基于冷凝效应的微波 VOC 气体传感器。该传感器设计新颖,不使用敏感材料,利用冷凝效应检测丙酮气体。传感器系统由微波传感器和温度控制装置组成。当传感器温度降低到丙酮沸点以下时,丙酮气体就会在传感器表面凝结,从而实现对丙酮气体的精确检测。实验结果表明,传感器表面的丙酮累积量与其响应呈正相关,3000 ppm 丙酮气体的最大响应为 0.34 dB。此外,本研究还考察了传感器添加敏感材料 MXene 后的检测机制,并比较了传感器在不同温度(-10 ℃、0 ℃ 和 60 ℃)下的性能。结果表明,在 -10 °C 时,传感器主要通过物理吸附捕捉丙酮,而在 25 °C 和 60 °C 时,传感器主要通过化学吸附响应,最大响应为 0.29 dB。基于冷凝效应的挥发性有机化合物传感器无需敏感材料,不仅能达到与传统微波传感器相同的灵敏度,而且具有更强的稳定性和抗干扰能力。
Operation Temperature Effects on a Microwave Gas Sensor with and without Sensitive Material.
Microwave gas sensors have garnered attention for their high sensitivity and selectivity in the detection of volatile organic compounds (VOCs). However, traditional gas sensors generally rely on sensitive materials that degrade over time and are easily affected by the environment, compromising their stability and accuracy. This study proposes a microwave VOC gas sensor based on the condensation effect. The sensor adopts a novel design without sensitive materials, utilizing the condensation effect to detect acetone gas. The sensor system consists of a microwave sensor and a temperature control device. As the sensor temperature is lowered below the boiling point of acetone, the condensation of acetone gas on the sensor surface is achieved, enabling accurate detection of acetone gas. Experimental results indicate that the accumulated amount of acetone on the sensor surface is positively correlated with its response, with the maximum response of 3000 ppm acetone gas reaching 0.34 dB. Additionally, this study investigated the detection mechanism of the sensor after adding the sensitive material MXene and compared the performance of the sensor at different temperatures (-10 °C, 0 °C, and 60 °C). The results show that at -10 °C the sensor mainly captures acetone through physical adsorption, while at 25 and 60 °C, it primarily responds through chemical adsorption, with a maximum response of 0.29 dB. The VOC sensor based on the condensation effect without sensitive materials not only achieves the same sensitivity as traditional microwave sensors but also demonstrates stronger stability and anti-interference capabilities.
期刊介绍:
ACS Sensors is a peer-reviewed research journal that focuses on the dissemination of new and original knowledge in the field of sensor science, particularly those that selectively sense chemical or biological species or processes. The journal covers a broad range of topics, including but not limited to biosensors, chemical sensors, gas sensors, intracellular sensors, single molecule sensors, cell chips, and microfluidic devices. It aims to publish articles that address conceptual advances in sensing technology applicable to various types of analytes or application papers that report on the use of existing sensing concepts in new ways or for new analytes.