2019年6月6日 · Powder X-ray diffraction (PXRD), high-resolution transmission electron microscopy (HRTEM), and surface area measurement clearly reveal the COFs have honeycomb-like crystalline porous structure...

2023年1月16日 · Here, we report a series of [∞]catenane covalent organic frameworks (COFs), termed catena-COF-805, 806 and 807, which are formed through the mechanical interlocking of discrete organic...

2023年4月4日 · In particular, high resolution transmission electron microscopy (HRTEM) measures crystalline domain sizes and lattice spacings within local regions of COF thin films.

The solvothermal condensation of 1,4-phenylenebis (boronic acid) (PBBA) and 2,3,6,7,10,11-hexahydroxytriphenylene (HHTP) in a mixture of 1,4-dioxane and mesitylene (4:1 v/v) affords a boronate ester–linked 2D COF (COF-5), which precipitates within minutes (22).

2024年12月22日 · 韩宇教授团队利用超低剂量高分辨透射电子显微（ULD-HRTEM）技术对该COF的进行了实空间成像。 有趣的是，他们获得的图像揭示了两套6-MR孔，这两套孔都不呈标准的正六边形：一套孔道由六个凸边组成，外观近似圆形；而另一套孔道则由三个直边和三个凹边组 …

2022年4月6日 · Here we present a reconstruction strategy for COF synthesis that uses a reversible and removable covalent tether to pre-organize monomers before an irreversible polymerization. This route yields...

2022年4月19日 · Subsequently, we introduce a suite of methods to address the challenges peculiar to low-dose HRTEM, including rapid search for crystal zone axes, precise alignment of the image stack, and accurate determination of the defocus value.

2024年2月1日 · The downsized COF particles exhibit superior catalytic performance in electrochemical CO 2 reduction, with higher CO production rate and faradaic efficiency compared to conventional COF particles. The improved performance is attributed to the higher contact area with a conductive agent.

本文通过先进的表征技术，揭示了TAPB-DMPDA COF的双孔AA'堆叠结构，这一结构在孔径分布和电荷分布上与传统模型有显著差异，对COFs在分离和催化应用中的性能有重要影响。

2021年2月15日 · Ultra-thin two-dimensional (2D) covalent organic frameworks (COFs) nanosheets have received widespread interests in functional electronic devices due to their advantages of high porosities, large specific surface areas, tunable structures, abundant active sites, good crystallinity and rich π-electron array.