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Knut Deppert

Knut Deppert

Professor

Knut Deppert

Gold nanoparticles : Production, reshaping, and thermal charging

Author

  • Martin H. Magnusson
  • Knut Deppert
  • Jan Olle Malm
  • Jan Olov Bovin
  • Lars Samuelson

Summary, in English

Gold nanoparticles are of great interest for various nanoelectronic applications, e.g., for making single electron transistors or very fine leads to molecular size entities. For this and other applications, it is important that all particles have controllable size and shape. In this paper, we describe the production of size-selected gold aerosol particles in the 20 nm range made by evaporation in a high-temperature tube furnace and subsequent size selection. To obtain spherical particles, it was necessary to reshape the particles at high temperature, which was investigated for temperatures between 25°C and 1200°C. High-resolution transmission electron microscopy showed that the degree of crystallinity became higher for higher reshaping temperature. During reshaping at high temperature, an anomalous charging behavior was discovered, whereby negatively as well as positively charged particles became multiply negatively charged. Possible mechanisms for explaining this thermally activated phenomenon are discussed.

Department/s

  • Solid State Physics
  • Inorganic Chemistry Group, Ebbe Nordlander-lup-obsolete

Publishing year

1999-01-01

Language

English

Pages

243-251

Publication/Series

Journal of Nanoparticle Research

Volume

1

Issue

2

Document type

Journal article

Publisher

Springer

Topic

  • Materials Chemistry

Keywords

  • Gold
  • Nanoparticles
  • Particle synthesis
  • Size selection
  • Thermal charging

Status

Published

Research group

  • Inorganic Chemistry Group, Ebbe Nordlander-lup-obsolete

ISBN/ISSN/Other

  • ISSN: 1388-0764