Synthesis and surface photochemistry of graphitized carbon quantum dots

被引：90

作者：

Liu, Yun

Liu, Chun-yan ^{[1
]}

Zhang, Zhi-ying

机构：

[1] Chinese Acad Sci, Tech Inst Phys & Chem, Beijing 100190, Peoples R China

来源：

JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2011年 / 356卷 / 02期

关键词：

Carbon; Quantum dot; Photoluminescence; Hydrothermal; Surface passivation; GRAPHENE SHEETS; NANOPARTICLES; NANOCRYSTALS; ROUTE; CELLS;

D O I：

10.1016/j.jcis.2011.01.065

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Graphitized carbon quantum dots (CQDs) were synthesized by a simple hydrothermal process with cetyltrimethylammonium bromide (CTAB) as the starting material and nitric acid as surface oxidant. The photoluminescent quantum yield (QV) of CQDs could be greatly enhanced through surface esterification with glycol. Based on the structure characterization, we proposed that the CQDs consisted of the stack of graphene sheets sized several nanometers and their excitation-dependent photoluminescence (PL) should be attributed to the n -> pi* transition of C=O bond of surface carboxylic groups. And the PL of CQDs was obviously enhanced by the esterification of carboxylic groups, possibly due to the increase of the molecular coplanarity or the rigidity. (C) 2011 Elsevier Inc. All rights reserved.

引用

页码：416 / 421

页数：6

共 28 条

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