Effects of temperature and humidity on the performance of polymer-coated surface acoustic wave vapor sensor arrays.
Effects of temperature and humidity on the performance of polymer-coated surface acoustic wave vapor sensor arrays.
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DOI：
10.1021/ac9603643
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发表时间：
1996-07
影响因子：
7.4
通讯作者：
E. Zellers;Mingwei Han
中科院分区：
文献类型：
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作者：
E. Zellers;Mingwei Han
研究了温度和大气湿度对8个158 MHz表面声波传感器阵列性能的影响。检测的七种有机蒸气的灵敏度均表现出负的阿克里米诺斯温度依赖性，从38 ℃到18 ℃，响应增加1.5-4.4倍。温度效应的大小虽然大体上相似，但在某些传感器-蒸汽组合中差异很大，导致蒸汽响应模式发生显著变化。此外，发现在不同温度下操作相同涂层的传感器可以提供用于区分某些蒸汽的手段。传感器响应随温度的变化与假设理想蒸汽吸附行为的预期相当一致，并表明传感器涂层模量的变化不是重要的介导因素。即使对于非极性传感器涂层，对0至85%RH的相对湿度（RH）的响应也是重要的。观察到的有机蒸汽的灵敏度的显着变化作为大气湿度的函数的几个传感器蒸汽的组合，这反过来又影响了从传感器阵列获得的响应的模式。结果表明，温度或湿度的微小变化对基线稳定性的影响大于对蒸气的响应。传感器响应的蒙特卡罗模拟表明，无论工作温度和环境湿度如何，只要考虑到响应模式中温度或湿度引起的变化，使用四传感器阵列区分二元和三元混合物中的蒸汽的能力仍然很高。
The influences of temperature and atmospheric humidity on the performance of an array of eight polymer-coated 158-MHz surface acoustic wave vapor sensors were investigated. Sensitivities to the seven organic vapors examined all exhibited negative Arrhenius temperature dependencies, with responses increasing by factors of 1.5-4.4 on going from 38 to 18 degrees C. The magnitudes of the temperature effects, while generally similar, differed sufficiently among certain sensor-vapor combinations to cause marked changes in vapor response patterns. In addition, it was found that operating identically coated sensors at different temperatures could provide a means for discriminating certain vapors. The changes in sensor responses with temperature agreed reasonably well with those expected assuming ideal vapor sorption behavior and indicated that changes in the moduli of the sensor coatings were not important mediating factors. Responses to relative humidity (RH) from 0 to 85% RH were important even for the nonpolar sensor coatings. Significant changes in the sensitivities to the organic vapors were observed as a function of atmospheric humidity for several sensor-vapor combinations, which, in turn, affected the patterns of responses obtained from the sensor array. Results indicate that small changes in temperature or humidity have a larger effect on baseline stabilities than on the responses to the vapors. Monte Carlo simulations of sensor responses show that the ability to discriminate vapors in binary and ternary mixtures using a four-sensor array remains high regardless of the operating temperature and ambient humidity, provided that temperature-or humidity-induced changes in the response patterns are taken into account.