Lin Yuan, Li Wen-Hua, Wen Yingyi, Wang Guan-E, Ye Xiao-Liang, Xu Gang
Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou, Fujian, 350108, P. R. China.
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences (CAS), No. 155 Yangqiao Road West, Fuzhou, Fujian, 350002, P. R. China.
Angew Chem Int Ed Engl. 2021 Dec 1;60(49):25758-25761. doi: 10.1002/anie.202111519. Epub 2021 Nov 3.
High-quality MOF thin films with high orientation and controlled thickness are extremely desired for applications. However, they have been only successfully fabricated on flat substrates. Those MOF 2D thin films are limited by low exposed area and slow mass transport. To overcome these issues, MOF 3D thin films with good crystallinity, preferred orientation, and precisely controllable thickness in nanoscale were successfully prepared in a controllable layer-by-layer manner on nanowire array substrate for the first time. The as-prepared Cu-HHTP 3D thin film is superior to corresponding 2D thin films and showed one of the highest sensitivity, lowest LOD, and fastest response among all reported chemiresistive NH sensing materials at RT. This work provides a feasible approach to grow preferred-oriented 3D MOF thin film, offering new perspectives for constructing MOF-based heterostructures for advanced applications.
具有高取向性和可控厚度的高质量金属有机框架（MOF）薄膜在应用中极具需求。然而，它们仅在平坦基板上成功制备。那些MOF二维薄膜受到低暴露面积和缓慢质量传输的限制。为克服这些问题，首次在纳米线阵列基板上以可控的逐层方式成功制备出具有良好结晶度、择优取向且在纳米尺度上厚度可精确控制的MOF三维薄膜。所制备的Cu-HHTP三维薄膜优于相应的二维薄膜，并且在室温下是所有已报道的化学电阻式NH传感材料中灵敏度最高、检测限最低且响应最快的材料之一。这项工作提供了一种生长择优取向三维MOF薄膜的可行方法，为构建用于先进应用的基于MOF的异质结构提供了新的视角。
