2022年3月15日 · The high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) results (Fig. 2e) of PY-DHBD-COF confirm that the COF has an ordered tetragonal pore structure with a...

2025年1月17日 · In this study, we develop Cu single-atom-loaded covalent organic frameworks (Cu SA /COFs) as models to modulate excitonic effects. Temperature-dependent photoluminescence and ultrafast transient...

2022年2月1日 · In recent years, covalent organic frameworks (COFs) have been recognized as promising 2D and 3D crystalline polymers for producing SACs, featured with distinct benefits of porous structure, tailored functionality and high metal loading.

2021年6月4日 · 该部分内容介绍了常用的高角环形暗场像（HAADF-STEM）、环形明场像（ABF-STEM）与积分差分相位衬度扫描透射电镜技术（iDPC-STEM）。 其中HAADF-STEM成像直观，常用于含重元素样品的成像以及物相分析、异质界面表征、缺陷及掺杂研究等。 ABF-STEM可用于轻元素的直接成像观察，在锂、钠电池等研究中发挥着重要作用。...

2022年10月27日 · Here, we report an approach of covalent doping, whereby a COF is synthesized by copolymerization of halogenated and unsubstituted phenyldiboronic acids, allowing for random distribution of...

2024年6月27日 · The single-atom Co is visualized by the aberration-corrected high-angle annular dark-field scanning transmission electron microscopy (AC HAADF-STEM), and the C 3 –Co–N 1 coordination structure is demonstrated by X-ray absorption fine structure (XAFS) measurements.

2015年12月22日 · Crystallinity and porosity are of central importance for many properties of covalent organic frameworks (COFs), including adsorption, diffusion, and electronic transport. We have developed a new method for strongly enhancing both aspects through the introduction of a modulating agent in the synthesis.

2021年8月10日 · This work presents a constructive route for designing core–shell MOF@COF hybrids with controllable morphology adjustment of COF shell, leading to the improved photocatalytic ability to broaden the applications of MOF/COF hybrid materials.

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.

2024年3月4日 · 清洁能源驱动的电化学CO 2 还原反应 (CO 2 RR)被认为是一种有吸引力的一举两得的方法，它可以降低大气中CO 2 的浓度，并将CO 2 转化为增值化学品，如一氧化碳、甲酸和碳氢化合物。 中国科学院福建物质结构研究所黄远标 提出了一种含氧配位策略，在O 2 存在的情况下促进CO 2 的电还原。 主要开发并合成了一种二维 (2D)共轭金属共价有机骨架 (NiPc-Salen (Co) 2 -COF)，由具有明确Ni-N 4 -O位点的Ni酞菁 (NiPc)单元和具有双核Co- N2O2 位点的Salen …