Large-scale fabrication of heavy doped carbon quantum dots with tunable-photoluminescence and sensitive fluorescence detection

Siwei Yang; Jing Sun; Xiubing Li; Wei Zhou; Zhongyang Wang; Pen He; Guqiao Ding; Xiaoming Xie; Zhenhui Kang; Mianheng Jiang

doi:10.1039/C4TA00860J

Large-scale fabrication of heavy doped carbon quantum dots with tunable-photoluminescence and sensitive fluorescence detection†

Siwei Yang,^a Jing Sun,^a Xiubing Li,^a Wei Zhou,^b Zhongyang Wang,^b Pen He,^a Guqiao Ding,*^a Xiaoming Xie,^a Zhenhui Kang*^c and Mianheng Jiang^a

Author affiliations

* Corresponding authors

^a State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Science, Shanghai, China
E-mail: gqding@mail.sim.ac.cn

^b Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, China

^c Institute of Functional Nano & Soft Materials (FUNSOM), Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow Univeristy, Suzhou, China
E-mail: zhkang@suda.edu.cn

Abstract

Carbon quantum dots (CQDs) have been intensively investigated due to their interesting electrochemical and photoluminescent properties. Here, we report a novel method for large-scale preparation of heavy doped CQDs with tunable photoluminescence. In the present synthetic process, the carbon nanoparticles from Chinese ink were oxidized and cut simultaneously using a mature process to obtain oxidized-CQDs as precursors, and then the heteroatom (N, S or Se) doped CQDs were obtained by a one-step hydrothermal reduction and in situ doping treatment. The heavy doped CQDs are just 1–6 nm size, and have improved photoluminescence with different emission wavelengths, higher quantum yield, longer lifetime and good photostability. Further experiments suggested that these N and S doped CQDs were very sensitive for the detection of Cu²⁺ and Hg²⁺, respectively.

Journal of Materials Chemistry A

Large-scale fabrication of heavy doped carbon quantum dots with tunable-photoluminescence and sensitive fluorescence detection†

Abstract

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Large-scale fabrication of heavy doped carbon quantum dots with tunable-photoluminescence and sensitive fluorescence detection

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