Abstract
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 (NH3) 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 NH3 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 NH3 gas by the CHRs.
| Original language | Spanish (Mexico) |
|---|---|
| Article number | 100490 |
| Pages (from-to) | 1-8 |
| Number of pages | 8 |
| Journal | Colloids and Interface Science Communications |
| Volume | 44 |
| Issue number | 100490 |
| State | Published - 27 Sep 2021 |