Room temperature ammonia sensors based on zinc oxide and functionalized graphite and multi-walled carbon nanotubes

These sensors were almost insensitive to humidity, while all of them gave a good response in NH3 atmosphere, starting from about 45 ppm in the case of zinc oxide with fluorinated or nitrogenous MWCNTs and graphite or 50 ppm for Pd-COOH-MWCNTs sensors. These results are not actually as good as those reported in the literature, but this preliminary work proposes simpler and cheaper processes to realize NH3 sensor for room temperature applications.