化学
叶酸
范德瓦尔斯力
光致发光
发光
纳米技术
金属有机骨架
热液循环
化学工程
核化学
高分子化学
吸附
分子
物理化学
有机化学
光电子学
内科学
材料科学
医学
工程类
作者
Jing Li,Shuli Chen,Rui-Peng Yan,David J. Young,Mi Yan,Fei Hu
出处
期刊:Chinese Journal of Analytical Chemistry
[China Science Publishing & Media Ltd.]
日期:2023-06-01
卷期号:51 (6): 100251-100251
标识
DOI:10.1016/j.cjac.2023.100251
摘要
Metal organic frameworks (MOFs) {[Zn2(L1)2(SDB)2]·H2O}n (MOF1), [Zn2(L2)(SDB)2]n (MOF2) and [Zn2(L3)(hfipbb)2]n (MOF3) (L1 = 4,4′-(2,5-dimethyl-1,4-phenylene)bis(ethene-2,1-diyl))dipyridine), L2 = (E,E,E)-1,6-bis(4-pyridyl)-l,3,5-hexatriene, L3 = 4,4′-((2-methyl-1,4-phenylene)bis(ethene-2,1-diyl))bipyridine, H2SDB = 4,4′-sulfonyldibenzoic acid, H2hfipbb = 2,2-bis(4-carboxyphenyl) hexafluoropropane) were prepared by hydrothermal synthesis. Weak van der Waals forces were observed between 2D layers in MOF1 and MOF2. The weak interlayer interactions could be cleaved by external mechanical force and bulk samples were exfoliated into single-layer two-dimensional nanosheets by ultrasound in ethanol. Single-layer MOF nanosheets which had a lateral size of approximately 2 µm were generated after ultrasound treatment of MOF1 and MOF2. However, 3D coordination network of MOF3 could not be successfully exfoliated because of its different network structure. MOF1 and MOF2 nanosheets dispersed in ethanol displayed strong photoluminescence (PL), which could be quenched specifically by folic acid (FA) through a concentration dependent manner. This hypersensitive and fast luminescence sensing benefited from numerous active sites and broad specific surface area of these ultrathin nanosheets.
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