A Facile Microwave Avenue to Electrochemiluminescent Two-Color Graphene Quantum Dots

被引：800

作者：

Li, Ling-Ling ^{[1
]}

Ji, Jing ^{[1
]}

Fei, Rong ^{[1
]}

Wang, Chong-Zhi ^{[1
]}

Lu, Qian ^{[1
]}

Zhang, Jian-Rong ^{[1
]}

Jiang, Li-Ping ^{[1
]}

Zhu, Jun-Jie ^{[1
]}

机构：

[1] Nanjing Univ, Sch Chem & Chem Engn, State Key Lab Analyt Chem Life Sci, Nanjing 210093, Jiangsu, Peoples R China

来源：

ADVANCED FUNCTIONAL MATERIALS | 2012年 / 22卷 / 14期

基金：

中国国家自然科学基金;

关键词：

graphene quantum dots; microwave heating; electrochemiluminescence; cadmium ions; ELECTROGENERATED CHEMILUMINESCENCE; FUNCTIONAL-GROUPS; NANOPARTICLES; OXIDE; REDUCTION; GRAPHITE; CARBON; ELECTROCHEMISTRY; NANOCRYSTALS; CYSTEINE;

D O I：

10.1002/adfm.201200166

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

With the assistance of microwave irradiation, greenish-yellow luminescent graphene quantum dots (gGQDs) with a quantum yield (QY) up to 11.7% are successfully prepared via cleaving graphene oxide (GO) under acid conditions. The cleaving and reduction processes are accomplished simultaneously using microwave treatment without additional reducing agent. When the gGQDs are further reduced with NaBH4, bright blue luminescent graphene quantum dots (bGQDs) are obtained with a QY as high as 22.9%. Both GQDs show well-known excitation-dependent PL behavior, which could be ascribed to the transition from the lowest unoccupied molecular orbital (LUMO) to the highest occupied molecular orbital (HOMO) with a carbene-like triplet ground state. Electrochemiluminescence (ECL) is observed from the graphene quantum dots for the first time, suggesting promising applications in ECL biosensing and imaging. The ECL mechanism is investigated in detail. Furthermore, a novel sensor for Cd2+ is proposed based on Cd2+ induced ECL quenching with cysteine (Cys) as the masking agent.

引用

页码：2971 / 2979

页数：9

共 36 条

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