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Optical properties of pH-sensitive carbon-dots with different modifications.
- Source :
-
Journal of Luminescence . Apr2014, Vol. 148, p238-242. 5p. - Publication Year :
- 2014
-
Abstract
- Abstract: 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 of 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. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 00222313
- Volume :
- 148
- Database :
- Academic Search Index
- Journal :
- Journal of Luminescence
- Publication Type :
- Academic Journal
- Accession number :
- 94157454
- Full Text :
- https://doi.org/10.1016/j.jlumin.2013.12.007