美国波士顿学院Chia-Kuang Tsung团队开发了一宗通用策略，通过同时更换封盖剂在纳米颗粒和金属有机框架之间形成一个对齐的界面。相关研究成果发表在2021年3月29日出版的国际知名学术期刊《美国化学会杂志》。

将金属有机框架（MOFs）应用于其它材料表面以形成多功能材料近年来受到了广泛关注，然而，由于结构尺寸的数量级差异，控制MOF的过度生长是一个挑战。

在该文中，研究人员开发了一种通用策略，利用弱吸附封盖剂的动力学性质来调节金属纳米粒子（NPs）表面MOF的生长。在该胶态过程中，封端剂逐渐从金属表面解离，被MOF原位取代。MOF生长生成一个定义上良好的NP-MOF界面，而无需捕获封盖剂，从而在一个单晶MOF纳米晶体中封装一个NP，形成均匀的具有特定的小平面排列的核壳结构。

将ZIF-8和UiO-66型MOF包覆在十六烷基三甲基铵表面活性剂包覆的形状金属纳米粒子上，并用光谱仪监测了NP-MOF界面的形成。所定义的界面优于传统方法中定义不清的界面，对α，β-不饱和醛的加氢反应显示出对不饱和醇的高选择性。

该策略为在结构尺寸大不相同的材料之间创建对齐的界面开辟了一条新途径。

附：英文原文

Title: Creating an Aligned Interface between Nanoparticles and MOFs by Concurrent Replacement of Capping Agents

Author: Yang Li, Wei-Shang Lo, Furui Zhang, Xiaomeng Si, Lien-Yang Chou, Xiao-Yuan Liu, Benjamin P. Williams, Yu-Hsiu Li, Seung-Hea Jung, Yu-Shen Hsu, Fu-Siang Liao, Fa-Kuen Shieh, Mariam N. Ismail, Wenyu Huang, Chia-Kuang Tsung

Issue&Volume: March 29, 2021

Abstract: Applying metal–organic frameworks (MOFs) on the surface of other materials to form multifunctional materials has recently attracted great attention; however, directing the MOF overgrowth is challenging due to the orders of magnitude differences in structural dimensions. In this work, we developed a universal strategy to mediate MOF growth on the surface of metal nanoparticles (NPs), by taking advantage of the dynamic nature of weakly adsorbed capping agents. During this colloidal process, the capping agents gradually dissociate from the metal surface, replaced in situ by the MOF. The MOF grows to generate a well-defined NP-MOF interface without a trapped capping agent, resulting in a uniform core–shell structure of one NP encapsulated in one single-crystalline MOF nanocrystal with specific facet alignment. The concept was demonstrated by coating  ZIF-8 and UiO-66-type MOFs on shaped metal NPs capped by cetyltrimethylammonium surfactants, and the formation of the well-defined NP-MOF interface was monitored by spectroscopies. The defined interface outperforms ill-defined ones generated via conventional methods, displaying a high selectivity to unsaturated alcohols for the hydrogenation of an α,β-unsaturated aldehyde. This strategy opens a new route to create aligned interfaces between materials with vastly different structural dimensions.

DOI: 10.1021/jacs.1c01357

Source: https://pubs.acs.org/doi/10.1021/jacs.1c01357