A CO2 Sensor Using a Quartz Crystal Microbalance Coated with a Sensitive Membrane
A CO2 Sensor Using a Quartz Crystal Microbalance Coated with a Sensitive Membrane
复制标题
DOI：
10.1002/ecj.11601
复制
发表时间：
2014-02-01
影响因子：
0.3
通讯作者：
Higashimoto, Shinya
中科院分区：
文献类型：
--
作者：
Muraoka, Shigenobu;Kiyohara, Yuya;Higashimoto, Shinya
我们尝试制造一种 CO2 传感器，该传感器利用涂有丙烯腈-苯乙烯共聚物 (AS) 敏感膜的石英晶体微天平 (QCM)。通过测量 QCM 谐振频率的变化来确定用干燥 N-2 气体稀释的 CO2 气体的浓度。由于地球大气由 N-2、O-2、CO2、Ar 和水分组成，因此还检查了 QCM 对 Ar、O-2 和湿度的敏感性。结果表明，AS 涂层的 QCM 不仅对 CO2 敏感，而且对湿度敏感，但对 O-2 和 Ar 不敏感。研究了用潮湿的 N-2 气体稀释的 CO2 气体浓度与 QCM 频移之间的关系。结果发现，湿度补偿后的频移几乎与用干燥 N-2 气体稀释的 CO2 气体引起的频移相同。因此，证明可以使用 QCM 测量地球大气中 CO2 气体的浓度。研究还发现，随着 AS 膜厚度的增加，对 CO2 浓度和湿度的敏感性也随之增加。
We attempted to fabricate a CO2 sensor that utilizes a quartz crystal microbalance (QCM) coated with an acrylonitrile-styrene copolymer (AS) sensitive membrane. The concentration of CO2 gas diluted with dry N-2 gas was determined by measuring the shift in the resonant frequency of the QCM. Since the Earth's atmosphere consists of N-2, O-2, CO2, Ar, and moisture, the sensitivity of the QCM to Ar, O-2, and humidity was also examined. It was shown that AS-coated QCMs are sensitive not only to CO2 but also to humidity, but are insensitive to O-2 and Ar. The relationship between the concentration of CO2 gas diluted with damp N-2 gas and the frequency shifts in the QCMs was examined. It was found that the frequency shift compensated for humidity is almost the same as the frequency shift caused by CO2 gas diluted with dry N-2 gas. Hence, it was demonstrated that the concentration of CO2 gas in the Earth's atmosphere can be measured using a QCM. It was also found that the sensitivities to the concentration of CO2 and to humidity increase with increasing thickness of the AS membrane.