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Open AccessArticle

Precursor-Less Coating of Nanoparticles in the Gas Phase

Faculty of Applied Sciences, Delft University of Technology, Julianalaan 136, Delft 2628 BL, The Netherlands
Solid State Physics, Lund University, Box 118, Lund 221 00, Sweden
Department of Chemistry–Ångström Laboratory, Uppsala University, Box 538, Uppsala 751 21, Sweden
Authors to whom correspondence should be addressed.
Academic Editor: Maryam Tabrizian
Materials 2015, 8(3), 1027-1042;
Received: 17 January 2015 / Revised: 27 February 2015 / Accepted: 28 February 2015 / Published: 11 March 2015
(This article belongs to the Special Issue Inorganic Core-Shell Structures)
This article introduces a continuous, gas-phase method for depositing thin metallic coatings onto (nano)particles using a type of physical vapor deposition (PVD) at ambient pressure and temperature. An aerosol of core particles is mixed with a metal vapor cloud formed by spark ablation by passing the aerosol through the spark zone using a hollow electrode configuration. The mixing process rapidly quenches the vapor, which condenses onto the core particles at a timescale of several tens of milliseconds in a manner that can be modeled as bimodal coagulation. Gold was deposited onto core nanoparticles consisting of silver or polystyrene latex, and silver was deposited onto gold nanoparticles. The coating morphology depends on the relative surface energies of the core and coating materials, similar to the growth mechanisms known for thin films: a coating made of a substance having a high surface energy typically results in a patchy coverage, while a coating material with a low surface energy will normally “wet” the surface of a core particle. The coated particles remain gas-borne, allowing further processing. View Full-Text
Keywords: spark ablation; nanoparticles; coating; gas phase; continuous process spark ablation; nanoparticles; coating; gas phase; continuous process
MDPI and ACS Style

Pfeiffer, T.V.; Kedia, P.; Messing, M.E.; Valvo, M.; Schmidt-Ott, A. Precursor-Less Coating of Nanoparticles in the Gas Phase. Materials 2015, 8, 1027-1042.

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