Vapor-phase impregnation decomposition technique as an alternativeto decorate MWCNTs withPt and PdNPs for ammonia gas detection
Résumé
The Vapor Phase Impregnation decomposition method (VP-IDM) is presented in this study as an alternative technique to obtain well-dispersed metallic nanoparticles on CNTs, for ammonia (NH 3) gas detection. We have analyzed the effectiveness of this method by using chemiresistive sensors (CHRs) based on multi-walled carbon nanotubes (MWCNTs) decorated with Pt and Pd nanoparticles (NPs). We measured their sensitivity through their electrical resistance variation in the presence of NH 3 gas at concentrations from 10 to 200 ppm. Pt/MWCNTs showed the highest sensitivity of about 120% at 100 ppm and 250 • C. It was revealed that the size, dispersion, temperature and type of metal NPs deposited on the MWCNTs are crucial for the detection of the NH 3 gas by the CHRs.
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