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Precision Patterning with Luminescent Nanocrystal-Functionalized Beads

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Department of Chemistry, University of Bari, Via Orabona 4I, Bari 70126, Italy
IPCF-CNR Bari Division, Via Orabona 4I, Bari 70126, Italy
§ IBM Research − Zurich, Säumerstrasse 4, 8803 Rüschlikon, Switzerland
CNR- IPCF Messina Division, Contrada Papardo, Salita Sperone, Faro Superiore, 98158 Messina, Italy
CNR-IMM Lecce Division, Campus Universitario, Strada Prov. Lecce-Monteroni km 1,200, 73100 Lecce, Italy
*Corresponding author. E-mail: [email protected]
¶Present address: Institut Curie, UMR 168 11 rue Pierre et Marie Curie, 75248 Paris Cedex 5, France
#Present address: Leibniz Institute for New Materials (INM), Campus D2 2, 66123 Saarbrücken, Germany.
Cite this: Langmuir 2010, 26, 17, 14294–14300
Publication Date (Web):August 5, 2010
https://doi.org/10.1021/la1023339
Copyright © 2010 American Chemical Society

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    Abstract

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    A reliable strategy is presented to combine the preparation of functional building blocks based on polymer beads decorated with luminescent nanocrystals (NCs) and their precise positioning onto suitable patterns by capillary assembly technique. In particular, a layer-by-layer (LbL) polyelectrolyte (PE) deposition procedure has been implemented to provide uniform NC coverage on PS beads, thus conveying the optical properties of luminescent nanocrystals to highly processable PS beads. The latter have then been integrated into patterned stamps by means of template-driven capillary assembly. Their selective positioning has been directed by means of pattern geometry. The use of luminescent (CdSe)ZnS NCs offers a direct optical probe to evaluate the efficiency of the positioning procedure on the substrate, enabling the extension of the method to a wide range of materials, i.e., NCs with different compositions and specific geometry-dependent properties. Moreover, the precise control over the pattern geometry and the micrometer accuracy in positioning achieved by capillary assembly make such functional patterned structures excellent candidates for integration into devices exploiting specific size-dependent NC properties.

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    SEM investigation of the layer-by-layer procedure for the fabrication of NC-decorated PS beads. This material is available free of charge via the Internet at http://pubs.acs.org.

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