Au-WO₃ Nanowire-Based Electrodes for NO₂ Sensing

Abstract

In this work, a selective and highly sensitive gas sensor using tungsten oxide (WO 3 ) nanofibers was fabricated via electrospinning. WO 3 was functionalized with gold nanoparticles by magnetron sputtering at different sputtering times to obtain Au films with thicknesses of 1, 5, 10, and 15 nm. The sensing performance of Au film composite nanomaterials with different Au layer thicknesses was tested at 100−250 °C and different nitrogen dioxide (NO 2 ) concentrations ranging from 200 to 1000 ppb. The findings showed that the 10 nm Au−WO 3 composite nanomaterial sensor had the most significant improvement in the performance of the pristine WO 3 sensor compared with other Au−WO 3 composite nanomaterial sensors, and the optimal operating temperature of the sensor was 175 °C. The composite nanomaterial sensor exhibited excellent selectivity when exposed to different gases and also exhibited high sensibility when exposed to low concentrations of NO 2 under high humidity (80%). The mechanism of gas sensor performance improvement was also investigated.

2D/2D Nanostructured System Based on WO3/WS2 for Acetone Sensor and Breath Analyzer

“…It is obvious that sensors that can deliver accurate timely information have a crucial role to play in limiting the transmission of viruses and diseases, thereby saving many lives, particularly during this period of sanitary emergency known as COVID-19. , Researchers in this field are continuously seeking more sensitive and precise detection techniques, measurement principles, and innovative analytical methodologies to develop modern sensing devices and instruments. , However, the majority of volatile organic compound (VOC) sensors on the market today provide data on total VOCs rather than individual VOC, and no sensor is available to work for biomedical-scale (lower concentrations) to industrial-scale (higher concentrations) applications, while selectivity is another issue that sensor technology faces. , Due to social expectations, critical sensor performance characteristics including sensitivity, selectivity, stability, and utility must be increased. Sensor response, selectivity, resolution, accuracy, and precision limits of sensing devices are constantly being increased. ,, Their use and application potential are also quickly growing at the same time.…”

“…1,2 Researchers in this field are continuously seeking more sensitive and precise detection techniques, measurement principles, and innovative analytical methodologies to develop modern sensing devices and instruments. 3,4 However, the majority of volatile organic compound (VOC) sensors on the market today provide data on total VOCs rather than individual VOC, and no sensor is available to work for biomedical-scale (lower concentrations) to industrial-scale (higher concentrations) applications, while selectivity is another issue that sensor technology faces. 5,6 Due to social expectations, critical sensor performance characteristics including sensitivity, selectivity, stability, and utility must be increased.…”

“…3 /WS 2 molecule were understood using the spacing of HOMO and LUMO. Further research into the electrical characteristics of the WO 3 /WS 2 's VOC sensitivity was conducted.…”

Sputtered Ultrathin WO3 for Realizing Room-Temperature High-Sensitive NO2 Gas Sensors

“…In 2022, WO 3 nanofibers were fabricated via electrospinning and functionalized gold nanoparticles were developed through magnetron sputtering on a WO 3 film. This Au-WO 3 -based NO 2 gas sensor can detect 200 to 1000 ppb of gas at an operating temperature of 175 °C . Besides, in 2022, a hydrothermally assisted MXene-decorated WO 3 nanocomposite-based gas sensor was reported to detect 15 to 500 ppb of NO 2 at room temperature .…”

“…This Au-WO 3 -based NO 2 gas sensor can detect 200 to 1000 ppb of gas at an operating temperature of 175 °C. 28 Besides, in 2022, a hydrothermally assisted MXene-decorated WO 3 nanocomposite-based gas sensor was reported to detect 15 to 500 ppb of NO 2 at room temperature. 29 Furthermore, in 2022, an La-doped WO 3 -based chemoresistive gas sensor was developed by flame spray pyrolysis.…”