A Stable Luminescent Covalent Organic Framework Nanosheet for Sensitive Molecular Recognition

被引：44

作者：

Liu, Yaozu ^{[1
]}

Ren, Junxia ^{[1
,2
]}

Wang, Yujie ^{[1
]}

Zhu, Xin ^{[2
]}

Guan, Xinyu ^{[1
]}

Wang, Zisheng ^{[1
]}

Zhou, Yida ^{[1
]}

Zhu, Liangkui ^{[1
]}

Qiu, Shilun ^{[1
]}

Xiao, Shengxiong ^{[2
]}

Fang, Qianrong ^{[1
]}

机构：

[1] Jilin Univ, Coll Chem, State Key Lab Inorgan Synth & Preparat Chem, Changchun 130012, Peoples R China

[2] Shanghai Normal Univ, Educ Minist Key Lab Resource Chem, Shanghai Frontiers Sci Ctr Biomimet Catalysis, Coll Chem & Mat Sci,Shanghai Key Lab Rare Earth Fu, Shanghai 200234, Peoples R China

来源：

CCS CHEMISTRY | 2023年 / 5卷 / 09期

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

covalent organic framework; nanosheet; fluorescence detection; molecular recognition; FLUORESCENCE; CRYSTALLINE; MECHANISMS; POLYMERS; SENSORS;

D O I：

10.31635/ccschem.022.202202352

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Despite rapid advances in fluorescence detectors over the past decade, the development of a highly stable, sensitive, and selective fluorescence platform for molecular recognition remains a considerable challenge. Here we report a stable carbazole-based sp2 carbon fluorescence covalent organic framework (COF) nanosheet, termed a JUC-557 nanosheet. Owing to the synergistic effect of aggregation-induced emission-and aggregation-caused quenching-based chromophores, the architecture of the JUC-577 shows high absolute quantum yields (up to 23.0%) in the solid state and when dispersed in various solvents as well as excellent sensing performance toward specific analytes, such as iodine (Ka: 2.10 x 105 M-1 and LOD: 302 ppb), 2,4,6 -trinitrotoluene (Ka: 4.38 x 105 M-1 and LOD: 129 ppb), and especially nitrobenzene (Ka: 6.18 x 106 M-1 and LOD: 5 ppb) that is superior to that of fluorescence detection materials reported so far. Furthermore, the JUC-557 nanosheet preserves strong luminescence and sensitive recognition, even under harsh conditions, and allows trace detection of various analytes via a handheld UV lamp. These findings pave the way for developing stable ultrathin COF nanomaterials for highly sensitive and selective molecular detection.

引用

页码：2033 / 2045

页数：13

共 74 条

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