Optical properties of fluorescent zigzag graphene quantum dots derived from multi-walled carbon nanotubes

被引：43

作者：

Chen, Wei ^{[1
]}

Li, Fushan ^{[1
]}

Wu, Chaoxing ^{[1
]}

Guo, Tailiang ^{[1
]}

机构：

[1] Fuzhou Univ, Inst Optoelect Technol, Fuzhou 350002, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2014年 / 104卷 / 06期

基金：

中国国家自然科学基金; 国家高技术研究发展计划(863计划);

关键词：

SIZE;

D O I：

10.1063/1.4863963

中图分类号：

O59 [应用物理学];

学科分类号：

070305 [高分子化学与物理];

摘要：

Graphene quantum dots (GQDs), which are edge-bound nanometer-size graphene pieces, have fascinating electronic and optical properties due to their quantum confinement and edge effect. In this paper, GQDs were synthesized by using acid treatment and chemical exfoliation of multi-walled carbon nanotubes (MWCNTs). The structure of the GQDs was investigated by transmission electron microscope. The GQDs have a uniform size distribution, zigzag edge structure and two-dimensional morphology. The results indicated that the GQDs have bright blue emission upon UV excitation. The highly fluorescent GQDs exhibited high water solubility and good stability. It is shown that the acid treatment of MWCNTs leads to the formation of the functional group in zigzag sites, which results in the pH-dependent fluorescence of the GQDs. (C) 2014 AIP Publishing LLC.

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页数：4

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