Drastic Change in Photoluminescence Properties of Graphene Quantum Dots by Chromatographic Separation

被引：80

作者：

Fuyuno, Naoto ^{[1
]}

Kozawa, Daichi ^{[1
]}

Miyauchi, Yuhei ^{[1
,2
]}

Mouri, Shinichiro ^{[1
]}

Kitaura, Ryo ^{[3
,4
]}

Shinohara, Hisanori ^{[3
,4
]}

Yasuda, Toku ^{[5
,6
]}

Komatsu, Naoki ^{[5
]}

Matsuda, Kazunari ^{[1
]}

机构：

[1] Kyoto Univ, Inst Adv Energy, Uji, Kyoto 6110011, Japan

[2] Japan Sci & Technol Agcy, PRESTO, Kawaguchi, Saitama 3320012, Japan

[3] Nagoya Univ, Dept Chem, Nagoya, Aichi 4648602, Japan

[4] Nagoya Univ, Inst Adv Res, Nagoya, Aichi 4648602, Japan

[5] Shiga Univ Med Sci, Dept Chem, Otsu, Shiga 5202192, Japan

[6] Osaka Electrocommun Univ, Dept Mat Sci, Neyagawa, Osaka 5728530, Japan

来源：

ADVANCED OPTICAL MATERIALS | 2014年 / 2卷 / 10期

基金：

日本学术振兴会; 日本科学技术振兴机构;

关键词：

graphene quantum dots; graphene oxide; photoluminescence; high performance liquid chromatography; size separation; GREEN LUMINESCENCE; OXIDE; BLUE; GRAPHITE; ORIGIN; NANODOTS; AVENUE; FILMS; SIZE;

D O I：

10.1002/adom.201400200

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Graphene quantum dots (GQDs) have attracted a great deal of interest from the viewpoints of both fundamental studies and applications. Photoluminescence (PL) is one of the intriguing properties of GQDs, however, the mechanism of the PL in GQDs is not fully understood. In the present study, a drastic change in the PL from UV to red light region is reported among GQDs separated by size-exclusion high performance liquid chromatography. It is confirmed by transmission electron microscopy images that the GQDs are separated by the difference in their overall sizes. Two-dimensional PL excitation spectra of the chromatographically separated GQDs show four distinct emission peaks at approximate to 330, approximate to 440, approximate to 520, and approximate to 600 nm. The dominant luminescence features of the separated GQDs show discrete changes depending on the overall size of GQDs, indicating that the PL variation occurs because of differences in density, shape, and size of sp(2) fragments available in the GQDs.

引用

页码：983 / 989

页数：7

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