☆ 4.6 Article

Optical properties of pH-sensitive carbon-dots with different modifications

JOURNAL OF LUMINESCENCE (2014)

期刊

JOURNAL OF LUMINESCENCE

卷 148, 期 -, 页码 238-242

出版社

ELSEVIER

DOI: 10.1016/j.jlumin.2013.12.007

关键词

Carbon dots; Surface modification; pH measurement; Bio-imaging; Colloid

类别

Optics

资金

National Key Basic Research Program of China [2011CB925603]
Natural Science Foundation of China [61290305, 11374259]

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Protocol

Reagent

摘要

Carbon dots with unique characters of chemical inertness, low cytotoxicity and good biocompatibility, demonstrate important applications in biology and optoelectronics. In this paper we report the optical properties 01 pH-sensitive carbon dots with different surface modifications. The as-prepared carbon dots can be well dispersed in water by modifying with acid, alkali or metal ions though they tend to form a suspension when being directly dispersed in water We find that the carbon dots dispersed in water show a new emission and absorption character which is tunable due to the pH-sensitive nature. It is firstly proved that the addition of bivalent copper ions offers a high color contrast for visual colorimetric assays for pH measurement. The effect of surface defects with different modification On the performances of the carbon dots is also explored with a core-shell model. The hydro-dispersed carbon dots can be potentially utilized for cellular imaging or metal ion probes in biochemistry. (C) 2013 Elsevier B.V. All rights reserved.

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De Bin Fu, Yang Bing Xu, Yu Teng Zhang, Shan Ting Liu, Xiao Fei Yang, Sheng Hua Liu

Summary: A pair of new chiral molecules, (S)-4 and (R)-4, have been designed and synthesized by introducing valine-containing groups at symmetrical positions on the periphery of an indolo[3,2-b]carbazole unit. These molecules exhibit aggregation-induced circular dichroism (AICD) properties in DMF/water mixtures, and in a mixture with 99% water fraction, they show strong, mirror-image, blue circularly polarized luminescence (CPL) signals.

JOURNAL OF LUMINESCENCE (2024)

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