Berlin 2015 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 43: P8: Nanoparticles and Compsite Materials

CPP 43.16: Poster

Mittwoch, 18. März 2015, 10:00–13:00, Poster A

Growth and disintegration of silver nanowires in tubular J-aggregates — •Egon Steeg, Frank Polzer, Holm Kirmse, Yan Qiao, Jürgen P. Rabe, and Stefan Kirstein — Institut für Physik, Humboldt-Universität zu Berlin

The reduction of AgNO3 in the presence of tubular J-aggregates is used to prepare silver nanowires with 7 nm in diameter and lengths exceeding micrometers [1]. Here, we report on the influence of chloride ions on growth and dissolving of the wires. In presence of oxygen and a ligand the chloride ions are able to etch silver nanostructures by oxidizing neutral silver atoms back to ions [2]. This oxidative etching is more effective along defect zones than on defect free single crystals. Silver nanowires grown in the template structures are dissolved by addition of NaCl by this process and the silver is converted into AgCl while the tubular template is conserved. The dissolution of the Ag nanowires is explained by their structure which shows multiple twin boundaries. The transport of the oxidized Ag atoms is explained by transport across the tubular wall.

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

[2] Y. Zheng et al., Chem. Mater. 2014, 26, 22-33