Journal
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
Volume 410, Issue 24, Pages 6331-6336Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-018-1242-0
Keywords
Carbon quantum dots; Copper; Fluorimetric assay; Phosphorous and nitrogen-doped carbon quantum dots
Funding
- University of Sulaimani
- Ministry of Higher Education and Scientific Research in Kurdistan
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Carbon quantum dots are becoming powerful fluorophore materials for metal ion analysis. Here, highly passivated green phosphorous and nitrogen co-doped carbon quantum dots (C-dots) were prepared using low-temperature carbonization route. Strong green fluorescence emission around 490 nm and excitation wavelength independent C-dots were obtained. Morphological, surface, and optical properties of the C-dots were characterized. Fluorescence emission of C-dots was quenched selectively by copper ions and restored by adding copper chelators, such as EDTA and sulfide ions. Thus, C-dots were successfully used for direct determination of copper ions. Detection limit as low as 1.5 nM (s/n = 3) was achieved for copper ions. Such a low detection limit is very significant for metal analysis using our proposed facile method and low-cost substrates. Experimental results showed that the prepared C-dots demonstrated high sensitivity and selectivity for Cu2+ ion detection and the method is robust and rugged.
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