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Surface oxygen vacancies actuated MoO3/CuMoO4 self-assembled microspheres for highly selective triethylamine detection
Sensors and Actuators B: Chemical ( IF 8.0 ) Pub Date : 2022-06-21 , DOI: 10.1016/j.snb.2022.132256
Jia Guo , Hang Li , Qian Ma , Qi Zhang , Yi Wang , Xueying Wang

The construction of tunable oxygen vacancies on the surface of materials has become an emerging approach to develop excellent gas sensitivity, in spite of the critical need for the influencing mechanism. In this paper, novel MoO3/CuMoO4 self-assembled microspheres with superior gas-sensing performance to triethylamine (TEA) have been fabricated by a simple solvothermal route. The introduction of Cu2+ plays a key role for the surface defects and morphological evolution of MoO3-based composites. The sensors based on MoO3/CuMoO4 microspheres exhibit an optimal response of 240.1 toward 100 ppm TEA with fast response and recovery time (45/15 s) at a low operating temperature of 300 °C, together with the low detection limit of 500 ppb, good long-term stability and reliability, and remarkable selectivity for TEA. Actually, abundant oxygen vacancies as active sites greatly contribute to the increasing surface chemisorbed oxygen. The enhanced gas-sensing mechanism can be mainly ascribed from the combination of the formation of MoO3-CuMoO4 heterojunctions, surface oxygen vacancies, and the self-assembled microstructure for the improved electron transfer behavior. The present work provides a new insight into the design of surface oxygen vacancies actuated gas sensors with unique surface/interface reactive process and transport mechanism.



中文翻译:

表面氧空位驱动 MoO3/CuMoO4 自组装微球用于高选择性三乙胺检测

尽管迫切需要影响机制,但在材料表面构建可调谐氧空位已成为发展优异气敏性的新兴方法。本文通过简单的溶剂热法制备了新型 MoO 3 /CuMoO 4自组装微球,该微球具有优于三乙胺(TEA)的气敏性能。Cu 2+的引入对MoO 3基复合材料的表面缺陷和形貌演变起着关键作用。基于 MoO 3 /CuMoO 4的传感器微球对 100 ppm TEA 的最佳响应为 240.1,在 300 °C 的低工作温度下具有快速响应和恢复时间 (45/15 s),以及 500 ppb 的低检测限,良好的长期稳定性和可靠性,以及对 TEA 的显着选择性。实际上,丰富的氧空位作为活性位点极大地促进了表面化学吸附氧的增加。增强的气敏机制主要归因于 MoO 3 -CuMoO 4的形成的组合异质结、表面氧空位和自组装微结构以改善电子转移行为。目前的工作为具有独特的表面/界面反应过程和传输机制的表面氧空位驱动气体传感器的设计提供了新的见解。

更新日期:2022-06-24
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