Abstract
High-performance hydrogen sensors are important in many industries to effectively address safety concerns related to the production, delivering, storage and use of H2 gas. Herein, we present a highly sensitive hydrogen gas sensor based on SnO2-loaded ZnO nanofibers (NFs). The xSnO2-loaded (x = 0.05, 0.1 and 0.15) ZnO NFs were fabricated using an electrospinning technique followed by calcination at high temperature. Microscopic analyses demonstrated the formation of NFs with expected morphology and chemical composition. Hydrogen sensing studies were performed at various temperatures and the optimal working temperature was selected as 300 °C. The optimal gas sensor (0.1 SnO2 loaded ZnO NFs) not only showed a high response to 50 ppb hydrogen gas, but also showed an excellent selectivity to hydrogen gas. The excellent performance of the gas sensor to hydrogen gas was mainly related to the formation of SnO2-ZnO heterojunctions and the metallization effect of ZnO.
Highlights
Hydrogen gas (H2 ) is a highly clean and renewable source of energy [1]
The insets show higher magnification Field-emissionscanning scanningelectron electronmicroscopy microscopy (FE-SEM) images, which demonstrated the presence of nano-sized grains
For the SnO2 -loaded ZnO gas sensors used in this study, electron‐depletion layer (EDL) will be formed will be formed on the bare surfaces of ZnO and SnO2, which are exposed to air
Summary
Hydrogen gas (H2 ) is a highly clean and renewable source of energy [1]. it is flammable and explosive in the concentration ranges of 4–75 vol.% in air [2]. Loaded the gas sensing characteristics of 1D ZnO gas sensors [25,26,27] Another promising strategy is loading metal oxides can form heterojunctions with ZnO, acting as a strong source of resistance modulation of n-type [28] or p-type [29] metal oxides in the matrix of the ZnO nanomaterials. The we have fabricated xSnO2 -loaded (x = 0.05, 0.1 and 0.15) ZnO NFs for hydrogen gas sensing hydrogen gas sensing properties showed that the gas sensor with 0.1 SnO2 loading had the best investigations. They were synthesized by the electrospinning method, followed by calcination. The sensing mechanism was explained due to the formation of n-n
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