Humidity Sensing Properties of Films by Pre-irradiation Grafting of Acrylic Acid and Sodium Methallyl Sulfonate onto ETFE
Acrylic acid (AA) and sodium methallyl sulfonate (SMS) were grafted onto Poly(ethylene-co-tetrafluoroethylene) (ETFE) films by pre-irradiation, and we prepared a humidity sensing membrane including strong acid(—SO3Na) and weak acid (—COOH)groups. The structure and surface morphology of both grafted and ungrafted ETFE films are observed by fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM), respectively. A resistive humidity sensor was prepared based on the humidity sensing film and its electrical response to humidity was examined. The films showed high sensitivity with nearly three orders of magnitude change in the resistance during the relative humidity variation from 5％ to 98％.The film exhibits small hysteresis(less than 2％RH) and quick response(absorption:less than 2 min; desorption:less than 4 min). The effect of grafting yield on humidity sensing properties was discussed.
humidity sensors grafted ETFE films pre-irradiation graftin
FU Qun SUN Yanfeng WANG Deqing JIAO Zheng WU Minghong
College of Environmental and Chemical Engineering, Shanghai University, Shanghai 201800,China
国际会议
2007环境科学与技术国际会议(The 2007 International Symposium on Environmental Science and Technology)
北京
英文
2007-11-13（万方平台首次上网日期，不代表论文的发表时间）