New Room Temperature Ammonia Gas Sensor Synthesized by a Tantalum Pentoxide (Ta₂O₅) Dielectric and Catalytic Platinum (Pt) Metals

Effects of the annealing of amorphous Ta2O5 coatings produced by ion beam sputtering concerning the effusion of argon and the chemical composition

“…Amorphous Ta 2 O 5 is a material with a large variety of applications in electronic circuits [1], quantum technologies [2], gas [3] or molecular sensing [4], enhancement of Raman scattering [5], hydrogen generation activity [6] or hydrophobic activity [7]. Among the physical properties which allow this broad range of applications, the refractive index n~2.1 at 1064 nm is of the highest importance [8].…”

Room-Temperature Optoelectronic Gas Sensor Based on Core–Shell g-C3N4@WO3 Heterocomposites for Efficient Ammonia Detection

“…1−5 As a typical air pollutant, ammonia mainly comes from industrial/automobile exhaust emissions and biomass/fossil fuel combustion. 6 Human exhales also contain trace amounts of ammonia and thus excessive ammonia is considered an important indicator of kidney disease. 7−9 Therefore, the development of efficient ammonia sensors is essential and significant for environmental monitoring, medical diagnosis, and safety inspection.…”

“…Ammonia is a colorless, flammable, corrosive, toxic, and irritating harmful gas with a permissible exposure limit of 0.2–0.5 ppm in our environment. − As a typical air pollutant, ammonia mainly comes from industrial/automobile exhaust emissions and biomass/fossil fuel combustion . Human exhales also contain trace amounts of ammonia and thus excessive ammonia is considered an important indicator of kidney disease. − Therefore, the development of efficient ammonia sensors is essential and significant for environmental monitoring, medical diagnosis, and safety inspection. , Metal oxides such as ZnO, SnO 2 , WO 3 , In 2 O 3 , TiO 2 , and Fe 2 O 3 have been widely used in chemiresistive gas sensors due to their low cost, high response, and good stability. − Although great progress has been achieved, high operating temperature and low detection limit still restrict their practical applications. − Based on the principle of chemiresistive gas sensors, two effective methods of composite engineering and light excitation have been developed to promote carrier separation and improve sensor performance. − …”