title: Encapsulation of strongly fluorescent carbon quantum dots in metal-organic frameworks for enhancing chemical sensing.
abstract: Novel highly fluorescent (FL) metal-organic 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 Cu(2+) ion, with a wide response range (2-1000 nM) and a very low detection limit (80 pM), and have been successfully applied in the detection of Cu(2+) 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.
authors: Ministry of Education Key Laboratory of Analysis and Detection for Food Safety, Fujian Provincial Key Laboratory of Analysis and Detection for Food Safety, and Department of Chemistry, Fuzhou University , Fuzhou, Fujian 350108, China.
authors: Xiaomei
authors: X
authors: Lin
authors: Gongmin
authors: G
authors: Gao
authors: Liyan
authors: L
authors: Zheng
authors: Yuwu
authors: Y
authors: Chi
authors: Guonan
authors: G
authors: Chen
mesh_terms: D000327:Adsorption; D002244:Carbon / Q000737:chemistry*; D002413:Cations, Divalent; D003300:Copper / Q000032:analysis*; D005456:Fluorescent Dyes / Q000737:chemistry*; D005618:Fresh Water / Q000737:chemistry*; D057230:Limit of Detection; D046529:Microscopy, Electron, Transmission; D053761:Nanocomposites / Q000737:chemistry / Q000648:ultrastructure; D011094:Polyethyleneimine / Q000737:chemistry; D045663:Quantum Dots / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D017550:Spectroscopy, Fourier Transform Infrared; D014874:Water Pollutants, Chemical / Q000032:analysis*; D017641:Zeolites / Q000737:chemistry
chemical_list: D002413:Cations, Divalent; D005456:Fluorescent Dyes; D014874:Water Pollutants, Chemical; D017641:Zeolites; D002244:Carbon; D003300:Copper; D011094:Polyethyleneimine