Carbon Quantum Dots: Synthesis, Properties and Applications by Raz Jelinek

By Raz Jelinek

This publication introduces many of the points of the rising box of carbon dots. Their structural and physico-chemical houses in addition to their present and destiny capability functions are coated. a different bankruptcy on graphene quantum dots is supplied. The reader also will locate various synthesis routes for carbon quantum dots.

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R. Jana, R. Sarkar, J. Phys. Chem. C 113, 18546–18551 (2009) 11. L. Tian, D. Ghosh, W. Chen, S. Pradhan, X. Chang, S. Chen, Chem. Mater. 21, 2803–2809 (2009) 12. -A. Qiao, Y. Wang, Y. Gao, H. Li, T. Dai, Y. Liu, Q. Huo, Chem. Commun. 46, 8812–8814 (2010) 13. L. Tang, R. Ji, X. Cao, J. Lin, H. Jiang, X. S. M. Luk, S. Zeng, J. P. Lau, ACS Nano 6, 5102–5110 (2012) 14. M. Xu, G. He, Z. Li, F. He, F. Gao, Y. Su, L. Zhang, Z. Yang, Y. Zhang, Nanoscale 6, 10307– 10315 (2014) 15. F. Wang, S. Pang, L. Wang, Q.

In principle, surface states of the Carbon-Dots were believed to play a critical role in generation of the excited electronic state, subsequently relaxing to a lower surface energy state through light emission. Interestingly, the shorter wavelength luminescence observed by the researchers in the same Carbon-Dot samples was ascribed to presumably greater energy separation of core energy levels of the Carbon-Dots (Fig. 16). This interpretation, however, is controversial since, as discussed in length above, Carbon-Dots luminescence has been ascribed mostly to surface states rather than the carbon cores.

7 and showing that modulation of the “surface states” of Carbon-Dots is the underlying source for the excitation-dependent luminescence properties. Indeed, as discussed above in Chap. 2 (Carbon-Dots Synthesis), early research in the Carbon-Dots field has shown that luminescence could be achieved only after surface functionalization of the carbon nanoparticles through post-synthesis chemical reactions (also termed “surface passivation”). , no excitation-dependent luminescence) could be synthesized through careful modification of the Carbon-Dots’ surface, thereby eliminating or reducing the concentrations of the “surface defects” responsible for the different energy levels.

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