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.

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。