Zhao Yuming, Wang Sha, Zhai Xu, Shao Lei, Bai Xiaojue, Liu Yunling, Wang Tieqiang, Li Yunong, Zhang Liying, Fan Fuqiang, Meng Fanbao, Zhang Xuemin, Fu Yu
Department of Chemistry, College of Sciences, Northeastern University, Shenyang 110819, China.
State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, China.
ACS Appl Mater Interfaces. 2021 Feb 24;13(7):9206-9215. doi: 10.1021/acsami.0c21583. Epub 2021 Feb 8.
Bimetallic organic frameworks (Bi-MOFs) have been recognized as one of the most ideal precursors to construct metal oxide semiconductor (MOS) composites, owing to their high surface area, various chemical structures, and easy removal of the sacrificial MOF scaffolds through calcination. Herein, we synthesized Zn/Ni Bi-MOF for the first time via a facile ion exchange postsynthetic strategy, formed a three-dimensional framework consisting of infinite one-dimensional chains that is unattainable through the direct solvothermal approach, and then transformed the Zn/Ni Bi-MOF into a unique ZnO/NiO heterostructure through calcination. Notably, the obtained sensor based on a ZnO/NiO heterostructure exhibits an ultrahigh response of 280.2 toward 500 ppm -propanol at 275 °C (17.2-fold enhancement compared with that of ZnO), remarkable selectivity, and a limit of detection of 200 ppb with a notable response (2.51), which outperforms state-of-the-art -propanol sensors. The enhanced -propanol sensing properties may be attributed to the synergistic effects of several points including the heterojunction at the interface between the NiO and ZnO nanoparticles, especially a one-dimensional chain MOF template structure as well as the chemical sensitization effect of NiO. This work provides a promising strategy for the development of a novel Bi-MOF-derived MOS heterostructure or homostructure with well-defined morphology and composition that can be applied to the fields of gas sensing, energy storage, and catalysis.
双金属有机框架（Bi-MOFs）因其高比表面积、多样的化学结构以及通过煅烧易于去除牺牲性MOF支架等特性，被认为是构建金属氧化物半导体（MOS）复合材料最理想的前驱体之一。在此，我们首次通过简便的离子交换后合成策略合成了Zn/Ni Bi-MOF，形成了一种由无限一维链组成的三维框架，这是直接溶剂热法无法实现的，然后通过煅烧将Zn/Ni Bi-MOF转化为独特的ZnO/NiO异质结构。值得注意的是，基于ZnO/NiO异质结构制备的传感器在275℃下对500 ppm丙醇表现出280.2的超高响应（与ZnO相比提高了17.2倍）、卓越的选择性以及200 ppb的检测限和显著的响应（2.51），优于现有最先进的丙醇传感器。丙醇传感性能的增强可能归因于几个方面的协同效应，包括NiO和ZnO纳米颗粒界面处的异质结、特别是一维链状MOF模板结构以及NiO的化学敏化作用。这项工作为开发具有明确形态和组成的新型Bi-MOF衍生的MOS异质结构或同质结构提供了一种有前景的策略，可应用于气体传感、能量存储和催化等领域。
