基于CS-PVP K30复合物薄膜基的QCM湿度传感器

QCM Humidity Sensor Based on CS-PVP K30 Composite Film

摘要:

石英晶体微天平(QCM)作为纳克级精度传感器,通过在敏感区添加湿敏材料,能够在气相条件下高精度检测湿度,具有检测范围广、成本低和制作简单的优点。为提升湿敏材料的性能,扩展基于QCM的湿度传感器的应用,构建了基于壳聚糖(CS)基底,聚乙烯吡咯烷酮(PVP)成膜机理的复合物薄膜基的QCM湿度传感器。实验证明该传感器响应、恢复时间分别为13 s、14 s,在相对湿度11%~97%检测范围内的灵敏度达到57.84 Hz/% RH,在30天稳定性重复实验中最大频率波动小于10 Hz。

Abstract:

Quartz crystal microbalance (QCM), a nanogram-level sensor, offers the advantages of high detection accuracy, wide humidity detection range, low cost, and simple fabrication method via the addition of humidity-sen sitive materials in sensitive areas to detect humidity under gas phase conditions. To enhance the performance of hy groscopic materials and expand the applications of QCM-based humidity sensors, a QCM humidity sensor based on a chitosan (CS) substrate and polyvinylpyrrolidone (PVP) film-forming mechanism was constructed. The experimen tal results show that the response/recovery time of the sensor is 13 s/14 s, the sensitivity reaches 57.84 Hz/%RH in the detection range of 11%RH-97%RH, and the maximum frequency fluctuation is less than 10 Hz within 30 days in repeated experiments