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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 49: Poster: Surfaces, Interfaces, Thin Films, Nanostructures
CPP 49.16: Poster
Mittwoch, 22. März 2017, 18:30–21:00, P2-OG1
Silver iodide nanowires grown in amphiphilic tubular templates — •Egon Steeg, Katie Herman, Holm Kirmse, Jürgen P Rabe, and Stefan Kirstein — Institut für Physik, Humboldt-Universität zu Berlin
It was shown in previous work [1] that silver nanowires 6 nm in diameter can be grown by reduction of AgNO3 in the presence of tubular aggregates of cyanine dyes in aqueous solution. Here we present an adaptation of this system for the growth of AgI structures by using additional iodide ions. Wire-like, single crystal structures of AgI that fill the inner space of the tubular aggregates are found. These AgI structures have diameters of 6 to 7 nm and lengths of tens of nanometers. The crystal structure of the AgI wires was investigated by means of high resolution transmission electron microscopy and selected area electron diffraction. The AgI could be clearly identified by its typical wurtzite structure. Small crystallites of pure silver can be found embedded in these AgI wires. The relative orientation of the respective crystal lattices indicates epitaxial growth of AgI on pure Ag or vice versa. It is possible that the negatively charged iodide ions have a higher concentration in the interior of the tubular aggregates than in the surrounding solution. This would favor the growth of AgI crystals within the tubules. These findings may demonstrate a possible route for growing other metal halide structures within the amphiphilic cyanine dye tubules.
[1] E. Steeg et al., Journal of Colloid and Interface Science 472(2016)187