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    Langmuir-Schaefer Deposition of Quantum Dot Multilayers

    Year: 2010

    Journal: Langmuir (2010), 26(11), 7732-7736, 20121205

    Authors: Lambert, Karel; Capek, Richard K.; Bodnarchuk, Maryna I.; Kovalenko, Maksym V.; Van Thourhout, Dries; Heiss, Wolfgang; Hens, Zeger

    Organizations: Physics and Chemistry of Nanostructures, Ghent University, Krijgslaan 281-S3, 9000 Gent, Belgium; Department of Information Technology, Ghent University-IMEC, Sint-Pietersnieuwstraat 41, 9000 Gent, Belgium; Institute of Semiconductor and Solid State Physics, University Linz, Altenbergerstrasse 69, 4040 Linz, Austria

    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.