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SnO2-graphene composite gas sensor for a room temperature detection of ethanol

机译:SnO2-石墨烯复合气体传感器,用于乙醇的室温检测

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摘要

In ethanol production, it is useful to monitor the state of fermentation using a sensor that provides real-time measurement but does not disturb the process. We propose here a tin oxide (SnO2)-reduced graphene oxide (rGO) composite chemiresistive sensor that can be operated on low power and installed in a compact area for the monitoring of ethanol vapor. The sensor exhibited outstanding sensing responses to 29-145 ppm ethanol vapor, providing a sensitivity of 12 ppm(-1), a response time of 123 6, recovery time of 128 42 s, and a limit of detection of 3 ppm. The sensor showed good selectivity to ethanol over carbon dioxide, acetic acid and water vapor. The sensing mechanism of the sensor relies on the reaction of ethanol vapor and chemisorbed oxygen species in which the reaction rate increases due to an abundance of the chemisorbed oxygen within n-p heterojunctions of SnO2-rGO.
机译:在乙醇生产中,使用提供实时测量但不干扰过程的传感器监测发酵状态非常有用。我们在这里提出了一种氧化锡(SnO2)-还原氧化石墨烯(rGO)复合化学电阻传感器,该传感器可以在低功率下工作,并安装在一个紧凑的区域,用于监测乙醇蒸汽。该传感器对29-145 ppm的乙醇蒸汽表现出出色的传感响应,灵敏度为12 ppm(-1),响应时间为123 6,恢复时间为128 42 s,检测限为3 ppm。与二氧化碳、乙酸和水蒸气相比,该传感器对乙醇表现出良好的选择性。传感器的传感机制依赖于乙醇蒸汽和化学吸附氧物种的反应,其中,由于SnO2-rGO的n-p异质结中存在大量化学吸附氧,因此反应速率增加。

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