Generation of MoS^sub 2^ quantum dots by laser ablation of MoS^sub 2^ particles in suspension and their photocatalytic activity for H2 generation

MoS2 quantum dots (QDs) have been obtained in colloidal suspensions by 532 nm laser ablation (7 ns fwhp/pulse, 50 mJ/pulse) of commercial MoS2 particles in acetonitrile. High-resolution transmission electron microscopy images show a lateral size distribution from 5 to 20 nm, but a more homogeneous p...

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Bibliographic Details
Published in:Journal of nanoparticle research : an interdisciplinary forum for nanoscale science and technology 2016-08, Vol.18 (8), p.1
Main Authors: Baldoví, Herme G, Latorre-sánchez, Marcos, Esteve-adell, Iván, Khan, Anish, Asiri, Abdullah M, Kosa, Samia A, Garcia, Hermenegildo
Format: Article
Language:English
Subjects:
Irradiation
Nanoparticles
Silica
Online Access:Get full text
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Summary:MoS2 quantum dots (QDs) have been obtained in colloidal suspensions by 532 nm laser ablation (7 ns fwhp/pulse, 50 mJ/pulse) of commercial MoS2 particles in acetonitrile. High-resolution transmission electron microscopy images show a lateral size distribution from 5 to 20 nm, but a more homogeneous particle size of 20 nm can be obtained by silica gel chromatography purification in acetonitrile. MoS2 QDs obtained by laser ablation are constituted by 3-6 MoS2 layers (1.8-4 nm thickness) and exhibit photoluminescence whose [lambda]PL varies from 430 to 530 nm depending on the excitation wavelength. As predicted by theory, the confinement effect and the larger periphery in MoS2 QDs increasing the bandgap and having catalytically active edges are reflected in an enhancement of the photocatalytic activity for H2 generation upon UV-Vis irradiation using CH3OH as sacrificial electron donor due to the increase in the reduction potential of conduction band electrons and the electron transfer kinetics.
ISSN:1388-0764
1572-896X
DOI:10.1007/s11051-016-3540-9