Carbon quantum dots: Synthesis and correlation of luminescence behavior with microstructure

FANG Li-yang; ZHENG Jing-tang

doi:10.1016/S1872-5805(21)60031-8

Volume 36 Issue 3

Jun. 2021

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FANG Li-yang, ZHENG Jing-tang. Carbon quantum dots: Synthesis and correlation of luminescence behavior with microstructure. New Carbon Mater., 2021, 36(3): 625-631. doi: 10.1016/S1872-5805(21)60031-8

Citation:

FANG Li-yang, ZHENG Jing-tang. Carbon quantum dots: Synthesis and correlation of luminescence behavior with microstructure. New Carbon Mater., 2021, 36(3): 625-631. doi: 10.1016/S1872-5805(21)60031-8

FANG Li-yang, ZHENG Jing-tang. Carbon quantum dots: Synthesis and correlation of luminescence behavior with microstructure. New Carbon Mater., 2021, 36(3): 625-631. doi: 10.1016/S1872-5805(21)60031-8

Citation:

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Carbon quantum dots: Synthesis and correlation of luminescence behavior with microstructure

doi: 10.1016/S1872-5805(21)60031-8

FANG Li-yang^1
,,
ZHENG Jing-tang^{2
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1.
Shandong Chemical Engineering & Vocational College, Weifang 261100, China
2.
State Key Laboratory of Heavy Oil Processing, School of Chemical Engineering, China University of Petroleum, Qingdao 266580, China

Funds: This work is financially supported by the Science Development Plan Project of Weifang City, Shandong Province, China (No. 2018GX106)

More Information

Author Bio:
方黎洋，博士，副教授. E-mail：fangly609@sina.com
Corresponding author: ZHENG Jing-tang, Professor. E-mail: jtzheng03@163.com
Received Date: 2019-12-05
Rev Recd Date: 2020-07-12

Available Online: 2021-04-28

Publish Date: 2021-06-01

Abstract

Abstract

Two kinds of carbon quantum dots, C-dots-160 and C-dots-200 with different fluorescence luminescence behaviors were synthesized by a one-step hydrothermal method at 160 and 200 °C, respectively, using ammonium citrate as the raw material. The relationship between the microstructure of the C-dots and the fluorescence emission behavior was investigated. Results indicate that an increase of synthesis temperature introduces more oxygen and nitrogen atoms into the C-dots, increasing the total number of structural defects and altering their concentation ratio . It is this ratio difference in the two C-dots that causes their different luminescence behaviors. The proportion of several types of defects in the C-dots-200 are relatively balanced, leading to excitation wavelength-dependent fluorescence while the most abundant defects in C-dots-160 are in the form of C＝O, which is the main reason for its excitation independent luminescence behavior. The number of structural defects in C-dots-160 is less than in C-dots-200 and the latter has the stronger fluorescence emission.
- Carbon quantum dots,
- Structural defects,
- Excitation-independent fluorescence,
- Excitation-dependent fluorescence

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References(15)

References

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