微晶
单体
材料科学
聚合物
纳米颗粒
共价键
纳米
聚合
千分尺
高分子
扩散
激子
单晶
纳米技术
结晶学
化学工程
化学
化学物理
光学
有机化学
复合材料
生物化学
工程类
物理
冶金
热力学
量子力学
作者
Austin M. Evans,Lucas R. Parent,Nathan C. Flanders,Ryan P. Bisbey,Edon Vitaku,Matthew S. Kirschner,Richard D. Schaller,Lin X. Chen,Nathan C. Gianneschi,William R. Dichtel
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2018-07-06
卷期号:361 (6397): 52-57
被引量:487
标识
DOI:10.1126/science.aar7883
摘要
Covalent organic frameworks writ large Covalent organic framework (COF) materials have been difficult to characterize structurally and to exploit because they tend to form powders or amorphous materials. Ma et al. studied a variety of three-dimensional COFs based on imine linkages (see the Perspective by Navarro). They found that the addition of aniline inhibited nucleation and allowed the growth of crystals large enough for single-crystal x-ray diffraction studies. Evans et al. describe a two-step process in which nanoscale seeds of boronate ester–linked two-dimensional COFs can be grown into micrometer-scale single crystals by using a solvent that suppresses the nucleation of additional nanoparticles. Transient absorption spectroscopy revealed superior charge transport in these crystallites compared with that observed in conventional powders. Science , this issue p. 48 , p. 52 ; see also p. 35
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