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

Tarasenka, Natalie, Stupak, Aleksandr, Tarasenko, Nikolai, Chakrabarti, Supriya and Mariotti, D (2017) Structure and Optical Properties of Carbon Nanoparticles Generated by Laser Treatment of Graphite in Liquids. ChemPhysChem, 18 (9). pp. 1074-1083. [Journal article]

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URL: http://dx.doi.org/10.1002/cphc.201601182

DOI: 10.1002/cphc.201601182

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.

Item Type:Journal article
Keywords:carbon dots, laser irradiation, nanoparticles, photoluminescence, structural defects
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Engineering
Research Institutes and Groups:Engineering Research Institute
Engineering Research Institute > Nanotechnology & Integrated BioEngineering Centre (NIBEC)
ID Code:38207
Deposited By: Professor Davide Mariotti
Deposited On:26 Jul 2017 15:48
Last Modified:26 Jul 2017 15:48

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