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Updated: Apr 18, 2026

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Photoluminescence-tunable carbon nanodots: surface-state energy-gap tuning
Lei Bao1, Cui Liu, Zhi-Ling Zhang
1Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, State Key Laboratory of Virology, the Institute for Advanced Studies and Wuhan Institute of Biotechnology, Wuhan University, Wuhan, 430072, PR China.
Abstract:
The photoluminescence of carbon nanodots (C-dots) can be tuned by changing their surface chemistry or size because the photoluminescence is a function of the surface-state electronic transitions. Increasing the degree of surface oxidation leads to a narrowing of the energy gap of the surface; meanwhile, larger C-dots with an extensive π-electron system, which can couple with surface electronic states, can also lead to a narrowing of the energy gap of the surface states.
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