title: Large-scale synthesis of N-doped carbon quantum dots and their phosphorescence properties in a polyurethane matrix.
abstract: An easy, large-scale synthesis of N-doped carbon quantum dots (CQDs) was developed by using isophorone diisocyanate (IPDI) as a single carbon source under microwave irradiation. The yield of raw N-doped CQDs was about 83%, which is suitable for industrial-scale production. A detailed formation mechanism for N-doped CQDs involving self-polymerization and condensation of IPDI was demonstrated. Moreover, the obtained N-doped CQDs can be homogeneously dispersed in various organic monomers and do not need toxic organic solvents as dispersing agents. This advantage expands the range of applications of CQDs in composites. The N-doped CQDs dispersed in polyurethane (PU) matrixes emit not only fluorescence but also phosphorescence and delayed fluorescence at room temperature upon excitation with ultraviolet (UV) light. Furthermore, the phosphorescence of CQD/PU composites is sensitive to oxygen and therefore, the obtained-CQDs could be exploited in the development of novel oxygen sensors.
authors: State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China. yuedm@mail.buct.edu.cn.
authors: Jing
authors: J
authors: Tan
authors: State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China. yuedm@mail.buct.edu.cn.
authors: Rui
authors: R
authors: Zou
authors: State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China. yuedm@mail.buct.edu.cn.
authors: Jie
authors: J
authors: Zhang
authors: State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China. yuedm@mail.buct.edu.cn.
authors: Wang
authors: W
authors: Li
authors: State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China. yuedm@mail.buct.edu.cn and Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing 100029, China.
authors: Liqun
authors: L
authors: Zhang
authors: State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China. yuedm@mail.buct.edu.cn and Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing 100029, China.
authors: Dongmei
authors: D
authors: Yue