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


Gencer O., Çeven Ö. F. , Ünlü C.

Diamond and Related Materials, vol.123, 2022 (Journal Indexed in SCI Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 123
  • Publication Date: 2022
  • Doi Number: 10.1016/j.diamond.2022.108874
  • Title of Journal : Diamond and Related Materials
  • Keywords: Carbon dots, Excitation independent emission, Surface passivation

Abstract

© 2022 Elsevier B.V.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.