Elucidating the mechanism of dual-fluorescence in carbon dots

Macairan, Jun-Ray; de Medeiros, Tayline V.; Gazzetto, Michela; Yarur Villanueva, Francisco; Cannizzo, Andrea; Naccache, Rafik (2022). Elucidating the mechanism of dual-fluorescence in carbon dots. Journal of Colloid and Interface Science, 606(Pt 1), pp. 67-76. Elsevier 10.1016/j.jcis.2021.07.156

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Carbon dots have garnered significant attention owing to their versatile and highly tunable optical properties; however, the origins and the underlying mechanism remains a subject of debate especially for dual fluorescent systems. Here, we have prepared carbon dots from glutathione and formamide precursors via a one-pot solvothermal synthesis. Steady state and dynamic techniques indicate that these dual fluorescent dots possess distinct emissive carbon-core and a molecular states, which are responsible for the blue and red optical signatures, respectively. To further glean information into the fluorescence mechanism, electrochemical analysis was used to measure the bandgaps of the two fluorescent states, while femtosecond transient absorption spectroscopy evidenced the two-state model based on the observed heterogeneity and bimodal spectral distribution. Our findings provide novel and fundamental
insights on the optical properties of dual fluorescent dots, which can translate to more effective and targeted application development particularly in bioimaging, multiplexed sensing and photocatalysis.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Applied Physics > NCCR MUST
08 Faculty of Science > Institute of Applied Physics
08 Faculty of Science > Institute of Applied Physics > Lasers

UniBE Contributor:

Gazzetto, Michela and Cannizzo, Andrea

Subjects:

500 Science > 530 Physics
500 Science > 540 Chemistry

ISSN:

0021-9797

Publisher:

Elsevier

Language:

English

Submitter:

Andrea Cannizzo

Date Deposited:

04 Feb 2022 13:24

Last Modified:

06 Feb 2022 01:54

Publisher DOI:

10.1016/j.jcis.2021.07.156

PubMed ID:

34388574

BORIS DOI:

10.48350/164587

URI:

https://boris.unibe.ch/id/eprint/164587

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