Sensors and Actuators B: Chemical ( IF 8.0 ) Pub Date : 2023-02-24 , DOI: 10.1016/j.snb.2023.133569
Zhenggang Xue , Xin Jia , Xiaoping Gao , Yue Wu , Zhe Dong , Qingmin Hu , Jiaqiang Xu
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Engineering open nanostructures with regulable surface electron status possess great potential to increase gas-sensing performance of metal oxide semiconductor. Here, we develop a mesoporous tungsten oxide with special non-stoichiometric nature and double-activated surface electron status to realize ultralow-concentration detection of hydrogen sulfide. We found that the ordered mesoporous framework plays a crucial role in inducing the kinetic evolution to selectively form fixed non-stoichiometric meso-WO2.83 crystal, while the bulk-WO3 trends to lead the formation of bulk-WO2.9 or bulk-WO2.72 crystal. Impressively, the meso-WO2.83 crystal and co-existing oxygen defects exhibit obviously enhanced surface electron resonance and delocalization, thus leading a marked localized surface plasmon resonance (LSPR) effect. Further theoretical and experimental results confirm that the LSPR effect and oxygen defects endow special surface electron status to markedly improve the adsorption and electron transfer process of H2S molecules. The as-obtained meso-WO2.83 based MEMS sensors exhibit superior sensitivity, rapid response (<7 s), and ultralow detection limit of 5 ppb H2S. Our proposed strategy of open nanostructures with regulable surface electron status may create a new path to design fast and highly-effective H2S detection.
中文翻译:
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调节超灵敏 H2S 传感器开放 WO2.83 表面的电子状态
设计具有可调节表面电子状态的开放纳米结构具有提高金属氧化物半导体气敏性能的巨大潜力。在这里,我们开发了一种具有特殊非化学计量性质和双激活表面电子状态的介孔氧化钨,以实现硫化氢的超低浓度检测。我们发现有序介孔框架在诱导动力学演化以选择性地形成固定的非化学计量的meso-WO 2.83晶体方面起着至关重要的作用,而块状-WO 3趋向于导致块状-WO 2.9或块状-WO 2.72的形成水晶。令人印象深刻的是,meso-WO 2.83晶体和共存的氧缺陷表现出明显增强的表面电子共振和离域,从而导致显着的局部表面等离子体共振(LSPR)效应。进一步的理论和实验结果证实,局域表面等离子体共振效应和氧缺陷赋予特殊的表面电子状态,显着改善H 2 S分子的吸附和电子转移过程。所获得的基于 meso-WO 2.83的 MEMS 传感器表现出卓越的灵敏度、快速响应(<7 秒)和 5 ppb H 2 S 的超低检测限。我们提出的具有可调节表面电子状态的开放纳米结构策略可能会开辟一条新路径设计快速高效的 H 2 S 检测。