AI Article Synopsis
- - The study analyzed carbon dots (CDs) derived from a natural nanographite oxide mixture (NGO-MIX) using advanced techniques like 3D-excitation/emission matrix and high-performance size exclusion chromatography (HPSEC).
- - The results revealed that the NGO-MIX is heterogeneous, containing different fractions of CDs that vary in size and have unique absorption and fluorescence properties, despite one fraction showing higher fluorescence intensity.
- - Importantly, the research demonstrated for the first time that it is possible to separate oxidized nanographite into pure CDs fractions without non-fluorescent impurities, while simultaneously characterizing their properties.
Article Abstract
The carbon dots (CDs) from natural nanographite oxide mixture (NGO-MIX) and from its fraction NGO (3.5-10K) recovered after ultrafiltration and dialysis were analyzed by 3D-excitation/emission matrix and high-performance size exclusion chromatography (HPSEC) combined with online fluorescence and absorbance detections. HPSEC chromatograms obtained simultaneously with absorption within the wavelength range 200-500 nm and fluorescence detection at λ/λ = 270/450 nm/nm showed that NGO-MIX sample is not homogeneous and consist of well resolved CDs fractions with different sizes, absorption spectra and distinct fluorescence and non-fluorescence properties. Despite the twice higher fluorescence intensity of fraction NGO (3.5-10K) compared to the NGO-MIX, some impurity of non-fluorescent components was detected by HPSEC. The absorbance spectra of chromatographic peaks, extracted from the data of multi-wavelength absorbance detector, demonstrated different combinations of absorbance maxima. It means that different chromatographic peaks correspond to sized and chemically different CDs fractions. This study demonstrated for the first time the possibility of separating oxidized nanographite into homogeneous free from non-fluorescent material CDs fractions with their simultaneous spectroscopic characterization.
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| http://dx.doi.org/10.1016/j.chroma.2021.462251 | DOI Listing |
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