2008 NSTI Nanotechnology Conference and Trade Show - Nanotech 2008 - 11th Annual

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Clean Technology 2008

Humidity sensing properties of poly(o-anisidine)/SnO2 composites as revealed by impedance spectroscopy

D. Patil, P. Patil
North Maharashtra University, IN

humidity sensors, conducting polymer composites, SnO2, poly(o-anisidine)

Humidity sensing properties of poly(o-anisidine)/SnO2 (POA/SnO2) composites have been investigated by impedance spectroscopy. In this work, POA/SnO2 composites with different weight percents of SnO2 were synthesized by an in situ chemical oxidative polymerization of o-anisidine in presence of SnO2 particles. These composites were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, thermal gravimetric analysis (TGA) and scanning electron microscopy (SEM). Complex impedance data were obtained at the room temperature and various relative humidities, in the frequency range 0.1 Hz – 32 MHz. Humidity sensing properties such as relative humidity (RH)-impedance characteristics, humidity hysteresis, response time, repeatability and long-term stability of these composites have been investigated. The POA/SnO2 composites exhibit better sensing properties than pure POA, such as higher response factor, quicker response and small hysteresis. This study indicates that the POA/SnO2 composites can be considered as a potential sensing material for humidity.

Nanotech 2008 Conference Program Abstract