State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering , Jilin University , Changchun 130012 , P.R. China.
ACS Appl Mater Interfaces. 2018 Mar 21;10(11):9765-9773. doi: 10.1021/acsami.7b17669. Epub 2018 Jan 26.
Highly sensitive and stable gas sensors have attracted much attention because they are the key to innovations in the fields of environment, health, energy savings and security, etc. Sensing materials, which influence the practical sensing performance, are the crucial parts for gas sensors. Metal-organic frameworks (MOFs) are considered as alluring sensing materials for gas sensors because of the possession of high specific surface area, unique morphology, abundant metal sites, and functional linkers. Herein, four kinds of porous hierarchical CoO structures have been selectively controlled by optimizing the thermal decomposition (temperature, rate, and atmosphere) using ZIF-67 as precursor that was obtained from coprecipitation method with the co-assistance of cobalt salt and 2-methylimidazole in the solution of methanol. These hierarchical CoO structures, with controllable cross-linked channels, meso-/micropores, and adjustable surface area, are efficient catalytic materials for gas sensing. Benefits from structural advantages, core-shell, and porous core-shell CoO exhibit enhanced sensing performance compared to those of porous popcorn and nanoparticle CoO to acetone gas. These novel MOF-templated CoO hierarchical structures are so fantastic that they can be expected to be efficient sensing materials for development of low-temperature operating gas sensors.
高灵敏度和稳定性的气体传感器引起了广泛关注，因为它们是环境、健康、节能和安全等领域创新的关键。传感材料影响实际的传感性能，是气体传感器的关键部分。金属-有机骨架（MOFs）被认为是气体传感器有吸引力的传感材料，因为它们具有高比表面积、独特的形态、丰富的金属位点和功能配体。本文通过优化热分解（温度、速率和气氛），以 ZIF-67 为前体，选择性地控制了四种多孔分级 CoO 结构。ZIF-67 是通过共沉淀法在甲醇溶液中，在钴盐和 2-甲基咪唑的共同协助下获得的。这些具有可控交联通道、中孔/微孔和可调表面积的分级 CoO 结构是气体传感的高效催化材料。得益于结构优势，核壳和多孔核壳 CoO 对丙酮气体的传感性能优于多孔爆米花和纳米粒子 CoO。这些新型 MOF 模板 CoO 分级结构非常出色，有望成为开发低温运行气体传感器的高效传感材料。
