Influence of sulfur doping on the molecular fluorophore and synergistic effect for citric acid carbon dots
Guohua Cao(曹国华)1, Zhifei Wei(魏志飞)2, Yuehong Yin(殷月红)1,†, Lige Fu(付丽歌)1, Yukun Liu(刘玉坤)2, Shengli Qiu(邱胜利)2, and Baoqing Zhang(张宝庆)2,‡
1 School of Physics and Electronic Information Engineering, Henan Polytechnic University, Jiaozuo 454000, China; 2 School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
Abstract In citric acid-based carbon dots, molecular fluorophore contributes greatly to the fluorescence emission. In this paper, the nitrogen and sulfur co-doped carbon dots (N,S-CDs) were prepared, and an independent sulfur source is selected to achieve the doping controllability. The influence of sulfur doping on the molecular fluorophore was systematically studied. The introduction of sulfur atoms may promote the formation of molecular fluorophore due to the increased nitrogen content in CDs. The addition surface states containing sulfur were produced, and S element exists as -SO3, and -SO4 groups. Appreciate ratio of nitrogen and sulfur sources can improve the fluorescence emission. The photoluminescence quantum yields (PLQY) is increased from 56.4% of the single N-doping CDs to 63.4% of double-doping CDs, which ascribes to the synergistic effect of molecular fluorophores and surface states. The sensitivity of fluorescence to pH response and various metal ions was also explored.
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51571085) and the Key Scientific Research Projects of Colleges and Universities in Henan Province, China (Grant No. 20A430015).
Guohua Cao(曹国华), Zhifei Wei(魏志飞), Yuehong Yin(殷月红), Lige Fu(付丽歌), Yukun Liu(刘玉坤), Shengli Qiu(邱胜利), and Baoqing Zhang(张宝庆) Influence of sulfur doping on the molecular fluorophore and synergistic effect for citric acid carbon dots 2021 Chin. Phys. B 30 097802
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