Structure and Optical Properties of Carbon Nanoparticles Generated by Laser Treatment of Graphite in Liquids

Natalie Tarasenka, Aleksandr Stupak, Nikolai Tarasenko, Supriya Chakrabarti, D Mariotti

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

In this paper, we report the one-step synthesis of luminescent carbon nanoparticles (NPs) via laser irradiation of a graphite target in a solvent H2O, ethanol, or a 0.008 m aqueous diethylenetriaminepentaacetic acid (DTPA) solution. This is a simple approach for the fabrication of carbon dots with tunable photoluminescence (PL) that differs from other preparation methods, as no post-passivation step is required. The unfocused beam of the second harmonic (wavelength 532 nm) of the Nd:YAG laser was used in our experiments. The sizes of the prepared NPs were mainly distributed in the range of 1–8 nm with an average value of 3 nm. Carbon NPs of different inner structure were prepared: hexagonal diamond phase in aqueous DTPA solution, orthorhombic carbon phase in ethanol, and amorphous carbon in water. The synthesized carbon NPs have strong luminescence in the visible region, which makes them attractive for numerous biological applications. The photoluminescence of the synthesized NPs was investigated at different excitation wavelengths, from 260 to 450 nm. The highest intensities of the emission bands were detected for an excitation wavelength of 400 nm.
Original languageEnglish
Pages (from-to)1074-1083
JournalChemPhysChem
Volume18
Issue number9
Early online date23 Dec 2016
DOIs
Publication statusPublished - 5 May 2017

Keywords

  • carbon dots
  • laser irradiation
  • nanoparticles
  • photoluminescence
  • structural defects

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