Gas sensing properties of defect-controlled ZnO-nanowire gas sensor

Abstract

Photoluminescent and gas-sensing properties of ZnO nanowires prepared by an ionic liquid assisted vapor transfer approach

Comparison of NO2 Gas-Sensing Properties of Three Different ZnO Nanostructures Synthesized by On-Chip Low-Temperature Hydrothermal Growth

“…After growth, the chips were taken out and rinsed in DI-water three times and dried at 60°C for 12 h. (c) Synthesis of ZnO-NW s ZnO-NW s were also grown in a water bath, but in two steps. The first step used a 0.001-M equimolar mixture of Zn(NO) 2 and HMTA. The bath was kept at 60°C for 1 h and then increased to 70°C and kept there for 3 h and finally at 90°C for 24 h. Afterwards, the glass chips were taken out and rinsed in DI-water.…”

“…The bath was kept at 60°C for 1 h and then increased to 70°C and kept there for 3 h and finally at 90°C for 24 h. Afterwards, the glass chips were taken out and rinsed in DI-water. For the second step, a fresh precursor solution with a concentration of 0.0005 M after mixing of Zn(NO 3 ) 2 and HMTA was used. The water bath was kept at 70°C for 1 h and then increased to 90°C and kept at this temperature for 24 h. After growth, the chips were taken out and rinsed in DIwater three times and dried at 60°C for 12 h. 9 Reverse micro-emulsion/120 52 624/40 15.6 120 Nanorods 10 Solvothermal/120 20-25 44.2/50 0.88 300 Nanorod arrays 11 Reflux/95 39 32/100 0.32 175…”

“…5 Pencil-like ZnO nanorods, obtained via cetrimonium bromide (CTAB)-assisted hydrothermal process at 90°C, have a highest response of 206 to 40 ppm NO 2 at 400°C. 6 Many other similar studies were performed using ZnO one-dimensional (1D) nanostructures for NO 2 sensing. The summary is presented in Table I.…”

“…ZnO is an n-type semiconductor and has inherent defects, such as oxygen vacancy, 1 therefore possessing high NO 2 sensitivity. 2 ZnO nanostructures can easily be obtained by liquid or gas phase growth. In addition, ZnO nanostructures can be modified to increase the sensitivity and selectivity.…”

Analyzing the kinetic response of tin oxide-carbon and tin oxide-CNT composites gas sensors for alcohols detection

“…1 SnO 2 , ZnO and other binary oxides offer great properties including high sensitivity, better thermal stability, however they lack selectivity. [1][2][3][4][5] Hence often the sensor performance are improved by doping 6 or using nanocomposites of metal oxide with polymer or carbon nanotubes (CNTs). 7 The components of nanocomposites synergistically show enhanced sensing characteristics.…”