A thin film SnO2 gas sensor selective to ultra-low NO2 concentrations in air

NO2 gas sensing with polyaniline nanofibers synthesized by a facile aqueous/organic interfacial polymerization

“…Up to now, the metal oxides films have been widely used for detecting NO 2 gas. However, most of those sensors, lack high sensitivity and operate at high temperature (300-500 • C) [14,15]. Here we firstly demonstrate that the sensor based on PANI nanofibers simply prepared by the interfacial polymerization has the advantages of sensitivity, spatial resolution, and rapid time response for NO 2 gas at room temperature.…”

Preparation and characterization of SnO2 and Cu-doped SnO2 thin films using electrostatic spray deposition (ESD)

“…5 Over the time, tin (IV) oxide (SnO 2 ) proved to be the most widely used semiconductor oxide gas sensor which can detect a wide range of pollutant gases. [6][7][8][9][10] The sensing mechanism of tin (IV) oxide, being an n-type semiconductor, is based on resistance changes if it is exposed to oxidizing or reducing gases. A major drawback of SnO 2 and metal oxide-based gas sensors is the lack of selectivity, which limits its further applications when each gas must be detected in a mixture of gases.…”

“…It has been proved that the use of films presents advantages such as high mechanical resistance, easier application of the electrodes, and the possibility of miniaturization. 20 Different techniques were used to prepare SnO 2 or doped SnO 2 thin films, i.e., spray pyrolysis, 21,22 sol-gel process, 23-25 chemical vapor deposition, 26,27 sputtering, 8,28 pulsed-laser deposition. 29 In this work SnO 2 and CuO-doped SnO 2 thin films are deposited using the electrostatic spray deposition (ESD) technique which offers many advantages like simple set-up, ambient pressure operation, high deposition efficiency, and good control of the surface morphology.…”

Hollow SnO2 Hemisphere Arrays for Nitric Oxide Gas Sensing

“…The maximum response to NO gas was observed at 150 o C, which was slightly lower than our previous optimum working temperature 200 o C with SnO x single-wall carbon nanotube composites sensors 17) and other SnO 2 sensors for NO and NO 2 gas detection. [20][21][22] However, the response time was shorter at 200 o C, as shown in Fig. 5(a).…”