Regensburg 2010 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 13: Poster: Crystallization and Self Assembly
CPP 13.10: Poster
Montag, 22. März 2010, 16:30–18:00, Poster C
Photo-initiated Growth of sub-7 nm Silver Nanowires within a Chemically Active Organic Nanotubular Template — •D.M. Eisele1, H. v.Berlepsch2, C. Böttcher2, K.J. Stevenson3, D.A. Vanden Bout3, S. Kirstein1, and J.P. Rabe1 — 1Humboldt-Universität zu Berlin — 2Freie Universität Berlin — 3Universtiy of Texas at Austin
Silver nanowires are highly promising quasi 1-dimensional nanostructures for a variety of applications in electronics, photonics and catalysis, as well as for sensors. However, it remains a challenge to control their diameters in the interesting range below 10 nm, where their electronic properties begin to deviate substantially from the bulk. Here, it is reported that self-assembled uniform nanotubular J-aggregates of amphiphilic cyanine dye C8S3 [1] can be used as chemically active templates for the photo-initiated fabrication of silver nanowires by reduction of silver salt. The silver ions are reduced by oxidizing the template.[2] Due to the uniformity of the templates, crystalline silver wires have been obtained exhibiting a highly homogeneous diameter of (6.4+/-0.5) nm and lengths exceeding a micron. The nanotubular templates act as structure-directing agents and also as localized chemical reductants for silver ions. They may be functionalized further, e.g. with optoelectronically active polycations, providing access to quasi 1-dimensional organic/inorganic hybrid structures with well defined metallic nanowires as a core. [1] D. M. Eisele et al., Nature Nanotech. 4 (2009) 658; [2] J. L. Lyon et al., J. Phys. Chem. C 112 (2008) 1260.