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Knut Deppert

Knut Deppert

Professor

Knut Deppert

Synthesis of branched 'nanotrees' by controlled seeding of multiple branching events

Author

  • Kimberly Dick Thelander
  • Knut Deppert
  • Magnus Larsson
  • Thomas Mårtensson
  • Werner Seifert
  • Reine Wallenberg
  • Lars Samuelson

Summary, in English

The formation of nanostructures with controlled size and morphology has been the focus of intensive research in recent years(1-10). Such nanostructures are important in the development of nanoscale devices and in the exploitation of the properties of nanomaterials(9). Here we show how tree-like nanostructures ('nanotrees') can be formed in a highly controlled way. The process involves the self-assembled growth of semiconductor nanowires via the vapour-liquid-solid(11) growth mode. This bottom-up method uses initial seeding by catalytic nanoparticles(12) to form the trunk, followed by the sequential seeding of branching structures. Each level of branching is controlled in terms of branch length, diameter and number, as well as chemical composition. We show, by high-resolution transmission electron microscopy, that the branching mechanism gives continuous crystalline (monolithic) structures throughout the extended and complex tree-like structures. The controlled seeding method that we report here has potential as a generic means of forming complex branching structures, and may also offer opportunities for applications, such as the mimicking of photosynthesis in nanotrees.

Department/s

  • Solid State Physics
  • Centre for Analysis and Synthesis

Publishing year

2004

Language

English

Pages

380-384

Publication/Series

Nature Materials

Volume

3

Issue

6

Document type

Journal article

Publisher

Nature Publishing Group

Topic

  • Condensed Matter Physics
  • Chemical Sciences

Status

Published

ISBN/ISSN/Other

  • ISSN: 1476-4660