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HomeKey Engineering MaterialsKey Engineering Materials Vol. 727Preparation and Optical Properties Research on...

Preparation and Optical Properties Research on Graphene Quantum Dots

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Abstract:

In this work, graphene quantum dots were simply and rapidly prepared by thermal decomposition of citric acid. The resulting graphene quantum dots shows good dispersion and high crystallinity, the sizes can be effectively adjusted by controlling the temperature of decomposition. The results indicate that with the increase of temperature, the size of GQDs increased from 2 nm to 12 nm. The effect of the size of graphene quantum dots on the optical properties were carefully studied. Based on the optical properties and electrochemical results, the HOMO and LUMO value of GQDs with different sizes were obtained and the band gap becomes smaller from 3.36 eV to 2.87 eV with the increase of size of GQDs, which provides a potential application in the field of optoelectronic devices.

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Functional Materials Research II

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Periodical:

Key Engineering Materials (Volume 727)

Pages:

303-308

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.727.303

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Online since:

January 2017

Authors:

Yu Dong Shang, Xiu Hua Chen, Wen Hui Ma, Shao Yuan Li, Yue Chun Wang, Fu Wei Xiang

Keywords:

Band Gap, Graphene Quantum Dots, Optical Properties, Preparation

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© 2017 Trans Tech Publications Ltd. All Rights Reserved

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