以碳纸为电极,Nafion溶液再铸薄膜为感湿材料,并用氯化锂将膜转换成Li+型,制备了固体聚合物电解质湿度传感器.测定了不同相对湿度下,传感器的电导率响应与相对湿度之间关系.结果表明:在相对湿度为10%～97%范围内,传感器的电导率响应对数与相对湿度之间成良好的线性关系,线性度为0.997;传感器响应的时间为40s左右;于200h内稳定性和重复性良好.

Treat carbon paper with 3% PTFE solution and dried in 340 ℃ for 40 minutes to enhance its intension, and level off the surface of the carbon paper with a mixture of XC_72 carbon black and PTFE solution. With those treated carbon paper as electrodes,recast Nafion thin film from 5% Nafion solution as humidity sensitive material, a solid polymer electrolyte humidity sensor was prepared on a thin PET film.Take the relative humidity data from several saturated salt solutions, the relationship between conductivity response and relative humidity was studied at different relative humidies.The results showed: when the polymer electrolyte was H+ type,the linear response of range was about 40%～97% relative humidity, and exchanging the H+ of the Nafion into Li+, a linear response range was from 10% to 97% relative humidity, the humidity sensor has good stability and reversibility in 200 hours,its response time is less than 40 seconds and its conductivity response is less affected by temperatures.