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Aryl-modified graphene quantum dots with enhanced photoluminescence and improved pH tolerance.

Authors
  • Luo, Peihui1
  • Ji, Zhe
  • Li, Chun
  • Shi, Gaoquan
  • 1 Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China. , (China)
Type
Published Article
Journal
Nanoscale
Publisher
The Royal Society of Chemistry
Publication Date
Aug 21, 2013
Volume
5
Issue
16
Pages
7361–7367
Identifiers
DOI: 10.1039/c3nr02156d
PMID: 23824213
Source
Medline
License
Unknown

Abstract

Chemical modification is an important technique to modulate the chemical and optical properties of graphene quantum dots (GQDs). In this paper, we report a versatile diazonium chemistry method to graft aryl groups including phenyl, 4-carboxyphenyl, 4-sulfophenyl and 5-sulfonaphthyl to GQDs via Gomberg-Bachmann reaction. The aryl-modified GQDs are nanocrystals with lateral dimensions in the range of 2-4 nm and an average thickness lower than 1 nm. Upon chemical modification with aryl groups, the photoluminescence (PL) bands of GQDs were tuned in the range of 418 and 447 nm, and their fluorescence quantum yields (QYs) were increased for up to about 6 times. Furthermore, the aryl-modified GQDs exhibited stable PL (both intensity and peak position) in a wide pH window of 1-11. The mechanism of improving the PL properties of GQDs by aryl-modification was also discussed.

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