量子产额
荧光
材料科学
碳纤维
X射线光电子能谱
溶解度
氮气
紫外线
拉曼光谱
光化学
柠檬酸
激发态
兴奋剂
高分辨率透射电子显微镜
分析化学(期刊)
核化学
化学工程
纳米技术
有机化学
化学
复合数
透射电子显微镜
光学
物理
光电子学
核物理学
复合材料
工程类
作者
Xu Huai,Weiwei Duan,Jiayu Li,Qin Zhang,Qian Dong,Yang Cao,Taisheng Wang,Zewu Zhang,Zusheng Hang
标识
DOI:10.1142/s1793604721500090
摘要
A facile strategy is reported to synthesize nitrogen-doped carbon quantum dots (N-CQDs) with fluorescence emission by a one-step hydrothermal treatment under different temperatures with dicyanodiamide and citric acid as precursor materials of nitrogen and carbon sources, respectively. The as-produced N-CQDs display green or blue fluorescence under the ultraviolet lamp was controlled by the reaction temperature. Consequently, the as-prepared sample reacted at 200[Formula: see text]C (N-CQDs-200), within the range of 3 nm, exhibits blue fluorescence excited at 365 nm irradiation with the maximum quantum yield (QY) of ca. 30.6%. Moreover, the N-CQDs possess rich functional groups such as nitrous groups and multiple oxygenated groups, which result in a favorable solubility in most hydrophilic solvents. From the characterization and discussion of TEM, HRTEM, FT-IR, XPS, Raman and UV-Vis, it is illustrated that the fluorescence performance was largely related to the nanomorphology, nitrogen concentration, multi-surface emission sites and various forms of transitions derived from the nitrogen doping. With the excellent fluorescence performance and the favorable solubility in solvents, the products are potentially suitable for monitoring organics.
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