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

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

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...

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Bibliographic Details
Published in:Chemphyschem Vol. 18; no. 9; pp. 1074 - 1083
Main Authors: Tarasenka, Natalie, Stupak, Aleksandr, Tarasenko, Nikolai, Chakrabarti, Supriya, Mariotti, Davide
Format: Journal Article
Language:English
Published: Germany Wiley Subscription Services, Inc 05-05-2017
Subjects:
Carbon
Carbon dots
Diamonds
Diethylenetriamine pentaacetic acid
Ethanol
Excitation
Graphite
Laser beams
laser irradiation
Lasers
Nanoparticles
Neodymium lasers
Optical properties
Photoluminescence
Semiconductor lasers
structural defects
Synthesis
YAG lasers
laser irradiation
structural defects
carbon dots
nanoparticles
photoluminescence
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Summary: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. Photoluminescent carbon nanodots of different inner structure (hexagonal diamond, orthorhombic carbon, and amorphous carbon phase) are synthesized by laser irradiation (532 nm) of a graphite target in liquids (H2O, ethanol or a 0.008 M aqueous diethylenetriaminepentaacetic acid solution). The synthesized carbon NPs have strong luminescence in the visible region that makes them attractive for biological applications
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ISSN:1439-4235
1439-7641
DOI:10.1002/cphc.201601182