Synthesis and Characterisation of Fluorescent Carbon Nanodots Produced in Ionic Liquids by Laser Ablation

Hemerson P.S. Castro, Virgínia S. Souza, Jackson D. Scholten*, Janine H. Dias, Jesum A. Fernandes, Fabiano S. Rodembusch, Roberto dos Reis, Jairton Dupont, Sérgio R. Teixeira, Ricardo R.B. Correia

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

Carbon nanodots (C-dots) with an average size of 1.5 and 3.0 nm were produced by laser ablation in different imidazolium ionic liquids (ILs), namely, 1-n-butyl-3-methylimidazolium tetrafluoroborate (BMI.BF4), 1-n-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide (BMI.NTf2) and 1-n-octyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide (OMI.NTf2). The mean size of the nanoparticles is influenced by the imidazolium alkyl side chain but not by the nature of the anion. However, by varying the anion (BF4 vs. NTf2) it was possible to detect a significant modification of the fluorescence properties. The C-dots are much probably stabilised by an electrostatic layer of the IL and this interaction has played an important role with regard to the formation, stabilisation and photoluminescence properties of the nanodots. A tuneable broadband fluorescence emission from the colloidal suspension was observed under ultraviolet/visible excitation with fluorescence lifetimes fitted by a multi-exponential decay with average values around 7 ns.

Original languageEnglish (US)
Pages (from-to)138-143
Number of pages6
JournalChemistry - A European Journal
Volume22
Issue number1
DOIs
StatePublished - Jan 4 2016

Keywords

  • carbon
  • fluorescence
  • ionic liquids
  • laser ablation
  • nanoparticles

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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