Abstract
Exploration in the way of understanding the optical behavior and structure of carbon nanodots has been increased due to their vast application. Their emission dependency on excitation wavelengths is the more prevalent and controversial subject. In this report we considered the optical structure of hydrothermally synthesized carbon nanodots using citric acid and 2,3-diaminopyridine as precursors. The presence of different emission centers experimented through anion exchange chromatography which resulted in fractions with more unique optical structures. The quantum confinement effect and energy exchange between different types of carbon nanodots, due to aggregation in higher concentration levels, was studied applying a stepwise dilution experiment. Analysis of the experimental data was done through the parallel factor analysis and the trajectory pattern recognition which resolved more about optical interactions and the presence of different emission centers in different particles. Results from infrared spectroscopy confirmed the dominating density of carboxyl functional groups on the nanodots with negative surface charges and higher influence of amine groups on dots with positive surface charges.
Highlights
Exploration in the way of understanding the optical behavior and structure of carbon nanodots has been increased due to their vast application
carbon nanodots (CND) are considered among the quantum dots (QD) which are mainly synthesized by the heavy elements[3,6,9]
The quantum confinement effect is the signature feature of QDs which relates the emission band to their size, but the CNDs do not exhibit this feature in the same way and reasons[1,3,4,11,12,13]
Summary
Exploration in the way of understanding the optical behavior and structure of carbon nanodots has been increased due to their vast application. Their emission dependency on excitation wavelengths is the more prevalent and controversial subject. The quantum confinement effect is the signature feature of QDs which relates the emission band to their size, but the CNDs do not exhibit this feature in the same way and reasons[1,3,4,11,12,13] The lack of this feature in CNDs illustrates that their optical characteristics are coming from some emission centers rather than the whole particle. Through changing the concentration in an evolutionary manner and separation of different species of CNDs along with the in-detail data analysis, we are trying to gain more information on optical characteristics of CNDs
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