Encapsulation of Strongly Fluorescent Carbon Quantum Dots in Metal鈥揙rganic Frameworks for Enhancing Chemical Sensing

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• 作者：Xiaomei Lin ; Gongmin Gao ; Liyan Zheng ; Yuwu Chi ; Guonan Chen
• 刊名：Analytical Chemistry
• 出版年：2014
• 出版时间：January 21, 2014
• 年：2014
• 卷：86
• 期：2
• 页码：1223-1228
• 全文大小：355K
• ISSN：1520-6882

文摘

Novel highly fluorescent (FL) metal鈥搊rganic frameworks (MOFs) have been synthesized by encapsulating branched poly-(ethylenimine)-capped carbon quantum dots (BPEI-CQDs) with a high FL quantum yield into the zeolitic imidazolate framework materials (ZIF-8). The as-synthesized FL-functionalized MOFs not only maintain an excellent FL activity and sensing selectivity derived from BPEI-CQDs but also can strongly and selectively accumulate target analytes due to the adsorption property of MOFs. The selective accumulation effect of MOFs can greatly amplify the sensing signal and specificity of the nanosized FL probe. The obtained BPEI-CQDs/ZIF-8 composites have been used to develop an ultrasensitive and highly selective sensor for Cu²⁺ ion, with a wide response range (2鈥?000 nM) and a very low detection limit (80 pM), and have been successfully applied in the detection of Cu²⁺ ions in environmental water samples. It is envisioned that various MOFs incorporated with FL nanostructures with high FL quantum yields and excellent selectivity would be designed and synthesized in similar ways and could be applied in sensing target analytes.