Langmuir-Schaefer deposition of quantum dot multilayers.
- Authors
- 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.
