Graphene quantum dots with controllable surface oxidation, tunable fluorescence and up-conversion emission

Shoujun Zhu; Junhu Zhang; Xue Liu; Bo Li; Xingfeng Wang; Shijia Tang; Qingnan Meng; Yunfeng Li; Ce Shi; Rui Hu; Bai Yang

doi:10.1039/C2RA20182H

Graphenequantum dots with controllable surface oxidation, tunable fluorescence and up-conversion emission†

Shoujun Zhu,^a Junhu Zhang,^a Xue Liu,^a Bo Li,^a Xingfeng Wang,^a Shijia Tang,^a Qingnan Meng,^a Yunfeng Li,^a Ce Shi,^a Rui Hu^a and Bai Yang*^a

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^a State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, P. R. China
E-mail: byangchem@jlu.edu.cn
Fax: +86-431-85193423
Tel: +86-431-85168478

Abstract

In this article, graphene quantum dots (GQDs) with tunable surface chemistry (increasing oxidation degree) were prepared by an efficient two-step method. The GQDs have tunable fluorescence induced by the degree of surface oxidation, fine solubility, high stability and applicable up-conversion photoluminescence (PL). The PL mechanism was investigated based on the surface structure and PL behaviors. More importantly, the GQDs have acid–base response property and can be applied as pH sensors.

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Graphenequantum dots with controllable surface oxidation, tunable fluorescence and up-conversion emission†

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Graphene quantum dots with controllable surface oxidation, tunable fluorescence and up-conversion emission

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