Dr. Avnan Hussein Haya, a faculty member at the College of Human Medicine at the University of Wraith Al-Anbiyaa (peace be upon him), has obtained a patent for an ammonia (NH3) gas sensor. Dr. Avnan Hussein stated that this patent discusses the preparation method of highly ordered, multilayered, hydroxide-activated multi-walled carbon nanotube (MWCNTs-OH) networks, which are arranged as a mat on a filtration paper using the Filtration from Suspension (FFS) technique to function as an ammonia gas sensor. Gold and silver nanoparticles have been added to the network's surface to enhance its sensitivity to the gas.
The sensing device was locally manufactured and used to evaluate the network's response to ammonia gas at concentrations as low as parts per million, while observing changes in sensitivity with variations in ammonia gas concentration and temperature. The prepared network exhibited an increase in resistance when exposed to ammonia gas and showed good sensitivity to low concentrations of ammonia gas at room temperature. Furthermore, the results indicated that the network remained consistently sensitive to ammonia gas in the ambient environment, unaffected by the surrounding air's quantity.
