Influence of Electron Acceptor and Electron Donor on the Photophysical Properties of Carbon Dots: A Comparative Investigation at the Bulk-State and Single-Particle Level

Indrajit Srivastava, John S. Khamo, Subhendu Pandit, Parinaz Fathi, Xuedong Huang, Anleen Cao, Richard T. Haasch, Shuming Nie, Kai Zhang, Dipanjan Pan

Research output: Contribution to journalArticle

Abstract

Carbon dots (CDs) are extensively studied to investigate their unique optical properties such as undergoing electron transfer in different scenarios. This work presents an in-depth investigation to study the ensemble-averaged state/bulk state and single-particle level photophysical properties of CDs that are passivated with electron-accepting (CD-A) and electron-donating molecules (CD-D) on their surface. The bulk-state experiments reveal that in a mixture of these CDs, CD-A dominates the overall photophyiscal properties and eventually leads to formation of at least two associated geometries, which is dependent on time, concentration, intramolecular electron/charge transfer, and hydrogen bonding. Single-particle studies, however, do not reveal an “acceptor-dominating” scenario based on analysis of instantaneous intensity, bleaching kinetics, and photoblinking, indicating that the direct interaction of these CDs may affect their photophysical properties in the bulk state due to formation of hierarchical structural assemblies. Here it is anticipated that these fundamental results will further provide insights toward the understanding of the complex mechanism associated with CD emission, which is one of the key contributors to their successful application. As an immediate application of these functional CDs, it is shown that they can be used as a sensing array for metal ions and serve as a powerful toolbox for their technological applications.

Original languageEnglish (US)
Article number1902466
JournalAdvanced Functional Materials
Volume29
Issue number37
DOIs
StateE-pub ahead of print - Jul 4 2019

Fingerprint

Carbon
Electrons
carbon
electrons
bleaching
Bleaching
assemblies
Metal ions
Charge transfer
metal ions
Hydrogen bonds
electron transfer
Optical properties
charge transfer
optical properties
Molecules
Kinetics
Geometry
kinetics
hydrogen

Keywords

  • carbon dots
  • donor–acceptor charge transfer complexes
  • hierarchical particle assembly
  • single-particle fluorescence imaging

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Influence of Electron Acceptor and Electron Donor on the Photophysical Properties of Carbon Dots : A Comparative Investigation at the Bulk-State and Single-Particle Level. / Srivastava, Indrajit; Khamo, John S.; Pandit, Subhendu; Fathi, Parinaz; Huang, Xuedong; Cao, Anleen; Haasch, Richard T.; Nie, Shuming; Zhang, Kai; Pan, Dipanjan.

In: Advanced Functional Materials, Vol. 29, No. 37, 1902466, 04.07.2019.

Research output: Contribution to journalArticle

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