Applied novel sensing material graphene/polypyrrole for humidity sensor

作者：Lin Wang De; Chang Hsiu Mei; Wu Ren Jang^*

来源：Sensors and Actuators B: Chemical , 2013, 181: 326-331.

DOI：10.1016/j.snb.2013.02.017

• Graphene/PPy
• Humidity sensor
• Hysteresis
• Impedance

A novel sensing graphene/polypyrrole (PPy) material was prepared by a chemical oxidative polymerization method with various weight percentages of graphene. The structure and morphology were characterized by XRD (X-ray diffraction), FTIR (Fourier transform infrared), TEM (transmission electron microscopy), UV-vis spectrometry and TGA (thermo-gravimetric analysis). The humidity sensing properties were measured by using an LCR (inductance, capacitance and resistance) analyzer. The results indicate that the sample with 10% graphene/PPy had better humidity sensing properties than the other samples at relative humidity (RH) in the range 12-90%. The response and recovery times were approximately 15s and 20s, respectively. The prepared sensor has a higher sensitivity (S=138) than those developed elsewhere and the humidity hysteresis value was very small at all humidities (<0.16%). The results herein demonstrate the potential of graphene/PPy composite for use in fabricating high-performance humidity sensors.

• 出版日期2013-5