Advanced

Precursor-Less Coating of Nanoparticles in the Gas Phase

Pfeiffer, Tobias V.; Kedia, Puneet; Messing, Maria LU ; Valvo, Mario and Schmidt-Ott, Andreas (2015) In Materials 8(3). p.1027-1042
Abstract
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... (More)
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. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Materials
volume
8
issue
3
pages
1027 - 1042
publisher
MDPI AG
external identifiers
  • wos:000351945400013
  • scopus:84930507100
ISSN
1996-1944
DOI
10.3390/ma8031027
language
English
LU publication?
yes
id
4c8ef7bd-4b1e-4ff4-9d38-82324c36f5c9 (old id 5281533)
date added to LUP
2015-04-24 10:51:19
date last changed
2017-01-01 05:53:05
@article{4c8ef7bd-4b1e-4ff4-9d38-82324c36f5c9,
  abstract     = {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.},
  author       = {Pfeiffer, Tobias V. and Kedia, Puneet and Messing, Maria and Valvo, Mario and Schmidt-Ott, Andreas},
  issn         = {1996-1944},
  language     = {eng},
  number       = {3},
  pages        = {1027--1042},
  publisher    = {MDPI AG},
  series       = {Materials},
  title        = {Precursor-Less Coating of Nanoparticles in the Gas Phase},
  url          = {http://dx.doi.org/10.3390/ma8031027},
  volume       = {8},
  year         = {2015},
}