Triggering excitation independent fluorescence in zinc(II) incorporated carbon dots: Surface passivation of carbon dots with zinc(II) ions by microwave assisted synthesis methods

Oğuz Gencer, Ömer Faruk Çeven, Caner Ünlü*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Carbon dots (CDs), versatile nanomaterials with unique photophysical and structural properties, often have excitation-dependent fluorescence due to the presence of carboxylic groups on the surface of the nanostructure. The excitation-dependent fluorescence of CDs is valuable for bioimaging, but considered undesirable for applications where monochromatic emission is required. Here in this paper, we demonstrate a green, fast and simple way to control the excitation-dependent fluorescence of CDs by passivating carboxylic groups on the surface of CDs with zinc (II) ions through a microwave synthesis method. Conventional CDs without surface passivation had excitation-dependent fluorescence, whereas zinc(II) ion-passivated CDs had excitation-independent fluorescence. Also, the surface passivation of CDs led to an increase in the quantum yield of CDs. The present work provides an inexpensive and user-friendly way to develop carbon dots with controllable emission properties by incorporating a metal ion into carbon dots through simple microwave-assisted synthesis.

Original languageEnglish
Article number108874
JournalDiamond and Related Materials
Volume123
DOIs
Publication statusPublished - Mar 2022

Bibliographical note

Publisher Copyright:
© 2022 Elsevier B.V.

Funding

This work was supported by Istanbul Technical University – Scientific Research Projects Unit (ITU-BAP) [ TGA-2019-41938 ]. C.Ü has received research grants from ITU-BAP (Istanbul Technical University – Scientific Research Projects Unit). The authors declare that they have no conflict of interest. This work was supported by Istanbul Technical University ? Scientific Research Projects Unit (ITU-BAP) [TGA-2019-41938].

FundersFunder number
ITU-BAPTGA-2019-41938
Istanbul Technical University – Scientific Research Projects Unit
Istanbul Teknik Üniversitesi

    Keywords

    • Carbon dots
    • Excitation independent emission
    • Surface passivation

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