涂敷脲醛树脂的石英晶体微天平湿度传感器

Quartz Crystal Microbalance Coated with Urea FormaldehydeResin Films Used as Humidity Sensor

在碱性条件下预先合成脲醛树脂单体,然后在酸性条件下于石英晶体的电极上原位合成脲醛树脂高分子薄膜,制备了石英晶体微天平湿度传感器。同时考察敏感膜厚度对检测灵敏度的影响以及传感器的响应特性、重复性和稳定性。试验结果表明:涂敷脲醛树脂薄膜的传感器频率随测试的相对湿度变化明显,传感器具有良好的重复性和稳定性。制作的湿度传感器可应用于实际的生产、生活中。

This paper reports a novel quartz crystal microbalance（QCM）humidity sensor.First,the urea-formaldehyde resin（UFR） polymer was synthesized in alkaline conditions,and then the polymer was prepared in situ by polymerization on the quartz crystal electrode in acidic conditions to form the sensitive layer of the humidity sensor.The influence of film thickness on the detection of sensitivity,the characteristics of response,repeatability,stability of the sensor were also investigated.Experiment results indicated that the frequency of the sensor coated with UFR film changed significantly with relative humidity,and the newly developed sensor exhibited good reproducibility and stability.The proposed sensor can be applied to detect humidity in practical production.