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Issue 16, 2013
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Aryl-modified graphene quantum dots with enhanced photoluminescence and improved pH tolerance

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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.

Graphical abstract: Aryl-modified graphene quantum dots with enhanced photoluminescence and improved pH tolerance

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Publication details

The article was received on 30 Apr 2013, accepted on 04 Jun 2013 and first published on 10 Jun 2013


Article type: Paper
DOI: 10.1039/C3NR02156D
Citation: Nanoscale, 2013,5, 7361-7367
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    Aryl-modified graphene quantum dots with enhanced photoluminescence and improved pH tolerance

    P. Luo, Z. Ji, C. Li and G. Shi, Nanoscale, 2013, 5, 7361
    DOI: 10.1039/C3NR02156D

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