Time-resolved imaging of gas phase nanoparticle synthesis by laser ablation
作者:
David B. Geohegan,
Alex A. Puretzky,
Gerd Duscher,
Stephen J. Pennycook,
期刊:
Applied Physics Letters
(AIP Available online 1998)
卷期:
Volume 72,
issue 23
页码: 2987-2989
ISSN:0003-6951
年代: 1998
DOI:10.1063/1.121516
出版商: AIP
数据来源: AIP
摘要:
The dynamics of nanoparticle formation, transport, and deposition by pulsed laser ablation ofc-Siinto 1–10 Torr He and Ar gases are revealed by imaging laser-induced photoluminescence and Rayleigh-scattered light from gas-suspended 1–10 nmSiOxparticles. Two sets of dynamic phenomena are presented for times up to 15 s after KrF-laser ablation. Ablation of Si into heavier Ar results in a uniform, stationary plume of nanoparticles, while Si ablation into lighter He results in a turbulent ring of particles which propagates forward at 10 m/s. Nanoparticles unambiguously formed in the gas phase were collected on transmission electron microscope grids forZ-contrast imaging and electron energy loss spectroscopy analysis. The effects of gas flow on nanoparticle formation, photoluminescence, and collection are described. ©1998 American Institute of Physics.
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