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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 12: Poster: Nanoparticles and Composite Materials

CPP 12.28: Poster

Montag, 11. März 2013, 17:30–19:30, Poster C

In-situ Synthesis of Semiconductor Nanoparticles Decorating Tubular J-aggregates — •Yan Qiao, Frank Polzer, Holm Kirmse, Egon Steeg, Stefan Kirstein, and Jürgen P. Rabe — Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany

Organic/inorganic hybrid nanomaterials, that combine the strengths of the individual organic and inorganic materials while compensating for their deficits, have recently attracted more and more attention. Quasi one-dimensional (1-D) nanomaterials, such as wires and tubes, have been intensively investigated owing to the benefit of dimensionality on electronic and optical properties [1]. Based on our previous results on silver [2], this work focuses on the fabrication of quasi 1-D organic/inorganic hybrid nanostructures consisting of nanotubular J-aggregates self-assembled from amphiphilic cyanine dyes, and semiconductor nanoparticles such as CdS decorating the surface of the nanotubes. Electrostatic interaction between the negative surface potential of the aggregates and the Cd2+ leads to the enrichment of Cd2+ within the ionic double layer close to the aggregate surface. Addition of thioactamide leads to the formation of CdS nanocrystals with diameters less than 6 nm. With investigation of cryo-TEM and UV-Vis spectroscopy, It is found that CdS nanoparticles are exclusively formed at the surface of the aggregates. This opens a route to the formation of efficiently electronically coupled organic/inorganic systems.

[1] Y. N. Xia et al., Adv. Mater. 2003, 15, 353.

[2] D. M. Eisele et al., J. Am. Chem. Soc. 2010, 132, 2104.