Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation, Beijing University of Civil Engineering and Architecture, Beijing 100044, China.
Dalton Trans. 2018 Jul 10;47(27):9014-9020. doi: 10.1039/c8dt02219d.
Metal oxide semiconductors with a porous hollow structure have received great attention in many fields. In this work, a facile preparation method of porous tube-like ZnO (PT-ZnO) was developed by annealing rod-like ZIF-L at high temperature, and the formation mechanism of the tube-like structure was discussed in detail. The corresponding gas sensing performances were determined adopting acetone as the target gas. Gas-sensing test results show that PT-ZnO has better acetone sensing performance than that of porous plate-like ZnO (PP-ZnO) derived from leaf-like ZIF-L, resulting from the unique tube-like structure and larger amount of adsorbed oxygen. It is found that the introduction of Au nanoparticles greatly improves the acetone sensing performance, which can be attributed to the activation of acetone by Au and the increased amount of adsorbed oxygen. Au/PT-ZnO has the largest amount of adsorbed oxygen which even becomes the dominant oxygen species on the surface of PT-ZnO, resulting in the best acetone-sensing performance.
具有多孔空心结构的金属氧化物半导体在许多领域受到了极大的关注。在这项工作中，通过在高温下退火棒状 ZIF-L 开发了一种制备多孔管状 ZnO（PT-ZnO）的简便方法，并详细讨论了管状结构的形成机理。采用丙酮作为目标气体来确定相应的气体传感性能。气体传感测试结果表明，PT-ZnO 比由叶状 ZIF-L 衍生的多孔板状 ZnO（PP-ZnO）具有更好的丙酮传感性能，这归因于独特的管状结构和更多的吸附氧。研究发现，引入 Au 纳米粒子可以极大地提高丙酮的传感性能，这可以归因于 Au 对丙酮的活化和吸附氧的增加。Au/PT-ZnO 具有最大的吸附氧量，甚至成为 PT-ZnO 表面的主要氧物种，从而具有最佳的丙酮传感性能。
