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Onion-Structured Spherical MoS2 Nanoparticles Induced by Laser Ablation in Water and Liquid Droplets’ Radial Solidification/Oriented Growth Mechanism
Author: Le Zhou, Hongwen Zhang, Haoming Bao, Guangqiang Liu, Yue Li , and Weiping Cai
Periodical: Journal of Physical Chemistry C
Page: 2017, 121 (41), pp 23233–23239
Full text link: http://pubs.acs.org/doi/ipdf/10.1021/acs.jpcc.7b07784
Periodical: Journal of Physical Chemistry C
Page: 2017, 121 (41), pp 23233–23239
Full text link: http://pubs.acs.org/doi/ipdf/10.1021/acs.jpcc.7b07784
Spherical MoS2 nanoparticles are fabricated by laser ablation of MoS2 target in water. The obtained nanoparticles are mostly nearly perfectly spherical in shape with smooth surface, and tens to hundreds of nanometers in diameters. Such spherical MoS2 nanoparticles are built by concentrically curved {002} planes and show onion-like structure. Further examination has revealed that there exist shrinkage cavities (or voids) in the central part of the MoS2nanoparticles or small pores dispersed in the particles and a few tadpole-like long-tailed nanoparticles in the products, indicating the marks of melting and molten liquid droplets’ solidification during laser ablation. A model is thus presented based on laser-induced MoS2liquid droplets’ generation and inward {002}-oriented growth via radial solidification, which reveals the growth mechanism of the spherical MoS2 nanoparticles with onion-like structure. Interestingly, such onion-like structured spherical MoS2 nanoparticles have exhibited much higher surface-enhanced Raman scattering (SERS) effect than the MoS2 nanoplates prepared by conventional methods. This work not only presents the route to the spherical MoS2nanoparticles with onion-like structure but also reveals the formation process for the MoS2nanoparticles in laser ablation in water.
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