Nitrogen dioxide sensing using tungsten oxide microspheres with hierarchical nanorod-assembled architectures by a complexing surfactant-mediated hydrothermal route

Abstract

WO3 microspheres with hierarchical nanorod-assembled architectures were synthesized by a complexing surfactant-mediated hydrothermal method and showed high-performance NO2 sensing properties.

ppb level detection of NO2 using a WO3 thin film-based sensor: material optimization, device fabrication and packaging

“…The comparison of present study along with responses observed by other researchers using different nanostructures of WO 3 is shown in Table 1. [42][43][44][45][46][47][48][49][50][51] The present study on the WO 3 thin lm-based NO 2 sensor concludes that sub-ppb level NO 2 detection with high sensitivity and selectivity can be obtained by simple reactive-ion sputtered technique, a scalable process. The WO 3 lm selectivity towards NO 2 was tested in the presence of CO, CO 2 , SO 2 , and NH 3 gases at 150 C. The study clearly indicates the high selectivity of the lm towards NO 2 among other gas species, as represented in Fig.…”

Tuning the Photo-Luminescence Properties of WO3 Layers by the Adjustment of Layer Formation Conditions

“…Tungsten oxide synthesized from PTA + EtOH sol-gel has much sharper peaks due to a more orderly structure with well-expressed W-O stretching vibration. The broad band at 3400 cm −1 can be attributed to W-OH stretching vibration, and the peak located at 1625 cm −1 corresponds to W-OH bending vibration mode of the adsorbed water molecules [ 46 ].…”

Nanowires-assembled WO3 nanomesh for fast detection of ppb-level NO2 at low temperature

“…The small peak at 41.5 eV can be attributed to the W 5p 3/2 of WO 3 [17,33]. The two evident peaks at 35.5 and 37.7 eV, belonging to W 4f 7/2 and W 4f 5/2 of WO 3 , respectively, suggest that the tungsten oxide nanostructure exists as W 6+ [34][35][36].…”

“…The electron depletion theory is well known to explain gas-sensing mechanisms by charge transfer between gas molecules and sensing materials [36,45]. Figure 9 shows the schematic diagram of NO 2 -sensing mechanism for WO 3 nanomesh sensor.…”