Synthesis of Graphene Quantum Dots by a Simple Hydrothermal Route Using Graphite Recycled from Spent Li-Ion Batteries

被引:3
作者
Darabian, Lyane M. [1 ]
Costa, Tainara L. G. [1 ]
Cipriano, Daniel F. [1 ]
Cremasco, Carlos W. [1 ]
Schettino Jr, Miguel A. [1 ]
Freitas, Jair C. [1 ]
机构
[1] Univ Fed Espirito Santo, Dept Phys, Lab Carbon & Ceram Mat, BR-29075910 Vitoria, ES, Brazil
来源
C-JOURNAL OF CARBON RESEARCH | 2022年 / 8卷 / 04期
关键词
graphene quantum dots; hydrothermal synthesis; graphene oxide; graphite; recycling; CARBON; OXIDE;
D O I
10.3390/c8040048
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Graphene quantum dots (GQDs) are nanosized systems that combine beneficial properties typical of graphenic materials (such as chemical stability, biocompatibility and ease of preparation from low-cost precursors) with remarkable photoluminescent features. GQDs are well-known for their low cytotoxicity and for being promising candidates in applications, such as bioimaging, optoelectronics, electrochemical energy storage, sensing and catalysis, among others. This work describes a simple and low-cost synthesis of GQDs, starting from an alcoholic aqueous suspension of graphene oxide (GO) and using a hydrothermal route. GO was prepared using graphite recycled from spent Li-ion batteries, via a modified Hummers method. The GO suspension was submitted to hydrothermal treatments at different temperatures using a homemade hydrothermal reactor that allows the control of the heating program and the assessment of the internal pressure generated in the reaction. The synthesized GQDs exhibited bright blue/green luminescence under UV light; showing the success of the chosen route and opening the way for future applications of these materials in the field of optoelectronic devices.
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页数:9
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