With the need to identify the amount of toxic gases (NO, NO2, CO, SO2, H2S, etc.) in the air in real time, the development of high-performance gas sensors in the manufacturing, ecological and health sectors is essential. Due to its benefits such as simple design, long lifetime, compact size and n, the semiconductor gas sensor is one of the most popular consistently applied sensors [1, 2]. The core part of the semiconductor gas sensor as a sensitive coating. A multitude of compounds, such as ZnO [3, 4], SnO2 [5, 6] and Fe2O3 [7, 8], were used to manufacture gas-sensitive coatings. However these frameworks have some drawbacks, such as low response, high energy consumption, and some humidity and temperature volatility. WO3 has exceptionally high sensitivity for NO2 detection compared to the conventional materials above [9, 10], and is a suitable candidate for gas sensor coating materials. And it is also stated that the doping into WO3 of another kind of oxides leads to the formation of semiconductor heterojunction, thereby increasing overall the coatings' gas sensitivity.
TiO2 is well established to be a kind of semiconductor material with excellent electrical properties. Improvements have been documented in the gas sensitivity of semiconductor WO3 induced by TiO2 doping. However, the latest TiO2 doping methods, which are not suitable for commercial development, are highly complex. In fact, the gas control problem of the TiO2-doped coatings has still not been clearly established. The WO3-based composite coatings doped with TiO2 were prepared by liquid-phase plasma spraying in this paper as per that concern, and the gas-sensing process of TiO2-WO3 composite coatings was extensively investigated. As already mentioned, it is also proved to be a potential method is tested loaded on a support material due to its delicate conductivity, strong catalytic properties, and remarkable chemical inertness. Nanofiber WO3-TiO2 may form n-n heterojunction, which can potentially present highly explosive localized areas and thus obtain unpredictable features for specific applications. In this analysis, we describe a simple and successful spin coating technique has been used to fabricated the quasi-1D WO3 nanoparticles-decorated TiO2 heterostructural nanofibers. High response, discern specificity, quick response time and recovery time for H2 gas were demonstrated by the as-prepared WO3-TiO2 material, making it a successful candidate for application in H2 sensors. A sensor adsorption and reaction model has also been suggested. The increase in the efficiency of gas sensing can be due to the creation of heterojunctions seen between two material types.