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Langmuir-Schaefer deposition of quantum dot multilayers.

Authors
  • Lambert, Karel
  • Capek, Richard K
  • Bodnarchuk, Maryna I
  • Kovalenko, Maksym V
  • Van Thourhout, Dries
  • Heiss, Wolfgang
  • Hens, Zeger
Type
Published Article
Journal
Langmuir
Publisher
American Chemical Society
Publication Date
Jun 01, 2010
Volume
26
Issue
11
Pages
7732–7736
Identifiers
DOI: 10.1021/la904474h
PMID: 20121263
Source
Medline
License
Unknown

Abstract

The application of colloidal nanocrystals in various devices requires their assembly into well-defined mono- or multilayers. We explore the possibilities of the Langmuir-Schaefer technique to make such layers, using CdSe quantum dots as a model system. The layer quality is assessed using atomic force microscopy, transmission electron microscopy, and UV-vis absorption spectroscopy. For hydrophobic substrates, we find that the Langmuir-Schaefer technique is an excellent tool for controlled multilayer production. With hydrophilic substrates, dewetting induces a cellular superstructure. Combination with photolithography leads to micropatterned multilayers, and combination of different nanocrystal sizes allows for the formation of 2D binary superstructures.

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