Supersonic Nanocrystal Deposition for Nanostructured Materials
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Supersonic Nanocrystal Deposition for Nanostructured Materials W.T. Nichols1, D.T. O’Brien 2, G. Malyavanatham3, M.F. Becker 2,3 and J.W. Keto1,3 1
Department of Physics Department of Electrical and Computer Engineering, 3 Texas Materials Institute-Materials Science and Engineering University of Texas at Austin, Austin, TX 78712 2
ABSTRACT We experimentally demonstrate the large scale production and controlled collection of metal and semiconductor nanocrystals by laser ablation of microparticles entrained at high density in a flowing aerosol. For silver, produced nanocrystals exhibit bimodal, log-normal size distributions. Mean particle sizes are controlled from 3-16 nm by varying the type and pressure of carrier gas as well as laser fluence. For collection, a micronozzle orifice (d = 200 µm) accelerates nanocrystals through a sonic jet into a vacuum chamber for deposition onto a room temperature substrate. We describe two regimes of deposition that depend on the nanocrystal's energy per atom on impact. Soft landings ( E
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