High-performance UV-activated room temperature NO₂ sensors based on TiO₂/In₂O₃ composite

Abstract

Porous TiO2 nanoparticle (NPs)-embedded In2O3 nanofibers (NFs) were synthesized using electrospinning for fabricating room temperature (RT) nitrogen dioxide (NO2) gas sensors. The diameter of the porous polycrystalline TiO2/In2O3 nanofibers was...

Design of 3D flower-like NiWO4/WO3 heterostructures with excellent trimethylamine sensing performance

“…This behavior can be attributed to the competition in adsorption between gas molecules (oxygen or TMA) and water molecules. 33,34 Significantly, even at the 80% RH level, the sensor maintains a response of 10.04 for 10 ppm TMA, demonstrating impressive sensing capability under high humidity conditions. In comparison with previously reported sensors (Table 1), the 10-NiWO 4 /WO 3 sensor exhibits exceptional performance characterized by elevated response levels, lower optimal operating temperature, rapid response rates, and reduced detection thresholds, thereby indicating substantial promise.…”

“…The sensing mechanism of metal oxide sensors typically involves changes in electrical properties arising from interactions between the target gas and the surface of the sensing material. 34,48 In the case of the WO 3 sensor, a considerable quantity of oxygen molecules in the air atmosphere adhere to the surface of the sensing film, capturing free electrons from the WO 3 conduction band and generating chemisorbed oxygen species (O 2 − , O − , and O 2− ) through the following reactions eqn (3)–(6), depending on the operation temperatures. 49 In this work, as shown in Fig.…”