Study on NH3 Gas Sensing Properties of PANI-WO3 Nanocomposites

We dispersed WO3 nanoparticles with average particle size of 20-30 nm into aniline monomers and prepared PANI-WO3 nanocomposites by chemical oxidative polymerization. PANI-WO3 nanocomposites were spin-coated on substrates with interdigital carbon electrodes to form PANI-WO3 nanocomposites films and to study the NH3 gas sensing properties at room temperature. The gas sensing properties of pure PANI and PANI-WO3 with different blending ratios were compared and evaluated. The minimum detectable concentration of NH3 gas of the sensor fabricated from PANI-20%WO3 nanocomposites is 3 ppm, and the sensitivity of 100 ppm NH3 gas is 31, which is five times higher than that of pure PANI. In addition, the response time and recovery time were faster than pure PANI, especially the recovery characteristics were significantly improved.

We dispersed WO3 nanoparticles with average particle

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