Precursor-Less Coating of Nanoparticles in the Gas Phase

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

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.

Detaljer

Författare
  • Tobias V. Pfeiffer
  • Puneet Kedia
  • Maria Messing
  • Mario Valvo
  • Andreas Schmidt-Ott
Enheter & grupper
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Den kondenserade materiens fysik
Originalspråkengelska
Sidor (från-till)1027-1042
TidskriftMaterials
Volym8
Utgivningsnummer3
StatusPublished - 2015
PublikationskategoriForskning
Peer review utfördJa