Hydrothermally synthesized porous ZnO nanosheets for methane sensing at lower temperature
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Hydrothermally synthesized porous ZnO nanosheets for methane sensing at lower temperature Yanqiong Yang1 · Xiaodong Wang1 · Guiyun Yi2 · Huimin Li1 · Chuang Shi1 · Guang Sun1 · Zhanying Zhang1
© Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Porous nanosheet ZnO was synthesized by the simple hydrothermal process, and its structure and morphology were characterized by XRD, SEM, TEM and BET. The ZnO sensor was constructed based on the ZnO material, and the gas-sensing performance test results showed that the ZnO-based sensor has good sensitivity and stability to methane at a lower temperature of 140 °C. It improves the gas sensing property of reported methane sensors. The significant gas sensitivity of the ZnO-based sensor may stem from the unique porous nanosheet structure of the ZnO. Keywords Porous ZnO nanosheets · Structural · Sensors · Methane sensing
1 Introduction Natural gas is one of the cleaner fuels, and methane ( CH4) has been widely used in family life and industrial production as a reliable energy source in recent years. CH4 is colorless, odorless and extremely flammable with an explosion concentration of 4.9–15.4% [1]. It is worth noting that CH4 shows thermodynamic stability due to its regular tetrahedral symmetrical structure. Therefore, it is a great challenge to achieve higher sensitivity detection of CH4 at lower temperatures below 200 °C [2]. Gas sensors based on semiconductor metal oxide materials have been applied to CH4 detection on account of their low cost, simple preparation and easy operation. However, the generally higher sensitive temperature of the sensor results in more power consumption [3, 4]. As a typical chemically and thermally stable n-type semiconductor material, ZnO is one of the most important gas sensing materials because of its fine electrical conductivity, good stability and response recovery characteristics. However, it cannot be ignored that traditional ZnO sensors generally have the disadvantages of high operating temperature and low sensitivity [5–7]. Thus, the development of highly * Xiaodong Wang [email protected] 1
School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, China
2
sensitive CH4 sensors capable of working at lower temperatures is particularly critical. The structure of the material is a key factor affecting the gas-sensitive behavior [8]. This work utilized hydrothermal route and calcination measures, and a novel porous ZnO nanosheet was successfully prepared. Gas sensitivity performance results show that the ZnO sensor exhibits good sensitivity and stability to lower concentration of CH4 at lower working temperature, and effectively improves the gas sensing capability of the reported C H4 sensors. Admittedly, the ZnO porous nanosheets can be beneficial to the practical CH4 detection applications. The possible sensitization mechanism of the constructed ZnO C H4 sen
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