量子产额
X射线光电子能谱
荧光
吸光度
碳化
杂原子
量子点
材料科学
碳纤维
透射电子显微镜
聚合
光谱学
光化学
荧光光谱法
柠檬酸
分析化学(期刊)
化学
纳米技术
化学工程
扫描电子显微镜
有机化学
聚合物
戒指(化学)
复合材料
工程类
物理
复合数
量子力学
色谱法
作者
Juan Hou,Wei Wang,Tianyu Zhou,Bo Wang,Huiyu Li,Ding Liu
出处
期刊:Nanoscale
[The Royal Society of Chemistry]
日期:2016-01-01
卷期号:8 (21): 11185-11193
被引量:176
摘要
Heteroatom doped carbon dots (CDs) have received increasing attention due to their unique properties and related applications. However, previously reported CDs generally show strong emission only in the blue-light region, thus restricting their further applications. And the fundamental investigation on the preparation process is always neglected. Herein, we have developed a simple and solvent-free synthetic strategy to fabricate nitrogen-doped CDs (N-CDs) from citric acid and dicyandiamide. The as-prepared N-CDs exhibited a uniform size distribution, strong yellowish-green fluorescence emission and a high quantum yield of 73.2%. The products obtained at different formation stages were detailedly characterized by transmission electron microscopy, X-ray diffraction spectrometer, X-ray photoelectron spectroscopy and UV absorbance spectroscopy. A possible formation mechanism has thus been proposed including dehydration, polymerization and carbonization. Furthermore, the N-CDs could serve as a facile and label-free probe for the detection of iron and fluorine ions with detection limits of 50 nmol L−1 and 75 nmol L−1, respectively.
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