Gas sensors based on anodic tungsten oxide

NO gas sensing ability of activated carbon fibers modified by an electron beam for improvement in the surface functional group

“…The dispersion solution (5 μL) was dropped onto an Si wafer, which was oxidized and sputtered with Pt, using a micro-pipette (Transferpette ® electronic pipette; BrandTech Scientific Inc., Essex, CT, USA) and then dried at room temperature http://carbonlett.org lution type. The restoration of the sp 2 domains by E-beam irradiation suggests a decrease in the number of edges, which act as pores in the ACFs. XRD patterns in Fig.…”

“…Nitric oxide (NO) is the main gas that leads to the production of nitrogen oxide contaminants in the atmosphere. Therefore, the detection of NO gas in the atmosphere is important [1,2].…”

Copper tungstate thin-films for nitric oxide sensing

“…It is worth noting that for some cases, there also exist chemical processes in the film bulk that contribute to the transport of electric charge, particularly when ionic migration and transport is possible. Consequently, monitoring changes in the electron transport properties provides information that allows the evaluation of the sensor functionality to target gas-phase species [4][5][6]11,13,[15][16][17][18][19][20]22]. Despite the thermal stress caused by cyclical temperature changes, the thin-film conductance profile showed good reproducibility (± 6 %) and signal stability for both the conductance value corresponding to the reference state (20 % O 2 in N 2 , T = 200 °C) and those at operating temperatures (300, 400, 500 °C).…”

“…Specifically, two major strategies have been used to improve sensor performance: i) WO 3 in combination with catalytic metals [8][9][10] and ii) metal-oxide composite formulations with the use of a metal-oxide cocatalyst [11][12][13][14]. The present work reports the latter as the experimental strategy to enhance the sensing profile of WO 3 , specifically using novel (CuWO 4 ) thin-films.…”

“…Previous studies have shown that WO 3 is a material highly suited for the real-time monitoring of gas-phase pollutants (conductometric sensing phase), particularly for NO x monitoring [6][7][8][9][10][11][12][13][14].…”