Hidden Properties of Carbon Dots Revealed After HPLC Fractionation

被引：116

作者：

Vinci, John C. ^{[1
]}

Ferrer, Ivonne M. ^{[1
]}

Seedhouse, Steven J. ^{[2
]}

Bourdon, Allen K. ^{[1
]}

Reynard, Justin M. ^{[1
]}

Foster, Barbara A. ^{[2
]}

Bright, Frank V. ^{[1
,3
]}

Colon, Luis A. ^{[1
,3
]}

机构：

[1] SUNY Buffalo, Dept Chem, Buffalo, NY 14260 USA

[2] Roswell Pk Canc Inst, Dept Pharmacol, Buffalo, NY 14263 USA

[3] SUNY Buffalo, Mat Sci & Engn Program, Buffalo, NY 14260 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2013年 / 4卷 / 02期

基金：

美国国家科学基金会;

关键词：

GRAPHENE QUANTUM DOTS; ONE-STEP SYNTHESIS; HYDROTHERMAL SYNTHESIS; OXIDE; PHOTOLUMINESCENCE; FLUORESCENCE; NANODOTS;

D O I：

10.1021/jz301911y

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：

Carbon dots (C-dots) are often synthesized, modified, and studied as a mixture. Unfortunately, the spectroscopic and biological properties measured for such C-dots assume that there is a high degree of homogeneity in the produced sample. By means of high-resolution separation techniques, we show that "as-synthesized" C-dots exist as a relatively complex mixture and that an unprecedented reduction in such complexity can reveal fractions of C-dots with unique luminescence properties. The wavelength-dependent photoluminescence commonly assigned as an inherent property of C-dots is not present in fractionated samples. While ultraviolet visible absorption profiles reported for C-dots are typically featureless, we have found fractions of C-dots possessing unique absorption bands, with different fractions possessing specific emission wavelengths. Furthermore, fractionated C-dots showed profound differences in emission quantum yield, allowing for brighter C-dots to be isolated from an apparent low quantum yield mixture. These more luminescent fractions of C-dots displayed improved biological compatibility and usefulness as cellular imaging probes.

引用

页码：239 / 243

页数：5

共 43 条

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