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Title: Facile synthesis and photoluminescence mechanism of graphene quantum dots

Abstract

We report a facile hydrothermal synthesis of intrinsic fluorescent graphene quantum dots (GQDs) with two-dimensional morphology. This synthesis uses glucose, concentrate sulfuric acid, and deionized water as reagents. Concentrated sulfuric acid is found to play a key role in controlling the transformation of as-prepared hydrothermal products from amorphous carbon nanodots to well-crystallized GQDs. These GQDs show typical absorption characteristic for graphene, and have nearly excitation-independent ultraviolet and blue intrinsic emissions. Temperature-dependent PL measurements have demonstrated strong electron-electron scattering and electron-phonon interactions, suggesting a similar temperature behavior of GQDs to inorganic semiconductor quantum dots. According to optical studies, the ultraviolet emission is found to originate from the recombination of electron-hole pairs localized in the C=C bonds, while the blue emission is from the electron transition of sp{sup 2} domains.

Authors:
; ; ; ;  [1];  [2]
  1. Laboratory of Condensed Matter Spectroscopy and Opto-Electronic Physics, and Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240 (China)
  2. SEU-FEI Nano Pico Center, Key Laboratory of MEMS of Ministry of Education, School of Electronics Science and Engineering, Southeast University, Nanjing 210096 (China)
Publication Date:
OSTI Identifier:
22399173
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 24; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ABSORPTION; ELECTRON-PHONON COUPLING; ELECTRONS; EXCITATION; FLUORESCENCE; GLUCOSE; GRAPHENE; HOLES; HYDROTHERMAL SYNTHESIS; MORPHOLOGY; PHASE TRANSFORMATIONS; PHOTOLUMINESCENCE; QUANTUM DOTS; RECOMBINATION; SEMICONDUCTOR MATERIALS; SULFURIC ACID; TEMPERATURE DEPENDENCE; TWO-DIMENSIONAL SYSTEMS; ULTRAVIOLET RADIATION; WATER

Citation Formats

Yang, Ping, Zhou, Ligang, Zhang, Shenli, Pan, Wei, E-mail: sjtushelwill@sjtu.edu.cn, Shen, Wenzhong, E-mail: wzshen@sjtu.edu.cn, and Wan, Neng. Facile synthesis and photoluminescence mechanism of graphene quantum dots. United States: N. p., 2014. Web. doi:10.1063/1.4904958.
Yang, Ping, Zhou, Ligang, Zhang, Shenli, Pan, Wei, E-mail: sjtushelwill@sjtu.edu.cn, Shen, Wenzhong, E-mail: wzshen@sjtu.edu.cn, & Wan, Neng. Facile synthesis and photoluminescence mechanism of graphene quantum dots. United States. doi:10.1063/1.4904958.
Yang, Ping, Zhou, Ligang, Zhang, Shenli, Pan, Wei, E-mail: sjtushelwill@sjtu.edu.cn, Shen, Wenzhong, E-mail: wzshen@sjtu.edu.cn, and Wan, Neng. Sun . "Facile synthesis and photoluminescence mechanism of graphene quantum dots". United States. doi:10.1063/1.4904958.
@article{osti_22399173,
title = {Facile synthesis and photoluminescence mechanism of graphene quantum dots},
author = {Yang, Ping and Zhou, Ligang and Zhang, Shenli and Pan, Wei, E-mail: sjtushelwill@sjtu.edu.cn and Shen, Wenzhong, E-mail: wzshen@sjtu.edu.cn and Wan, Neng},
abstractNote = {We report a facile hydrothermal synthesis of intrinsic fluorescent graphene quantum dots (GQDs) with two-dimensional morphology. This synthesis uses glucose, concentrate sulfuric acid, and deionized water as reagents. Concentrated sulfuric acid is found to play a key role in controlling the transformation of as-prepared hydrothermal products from amorphous carbon nanodots to well-crystallized GQDs. These GQDs show typical absorption characteristic for graphene, and have nearly excitation-independent ultraviolet and blue intrinsic emissions. Temperature-dependent PL measurements have demonstrated strong electron-electron scattering and electron-phonon interactions, suggesting a similar temperature behavior of GQDs to inorganic semiconductor quantum dots. According to optical studies, the ultraviolet emission is found to originate from the recombination of electron-hole pairs localized in the C=C bonds, while the blue emission is from the electron transition of sp{sup 2} domains.},
doi = {10.1063/1.4904958},
journal = {Journal of Applied Physics},
number = 24,
volume = 116,
place = {United States},
year = {Sun Dec 28 00:00:00 EST 2014},
month = {Sun Dec 28 00:00:00 EST 2014}
}