Galvanic Exchange in Colloidal Metal/Metal-Oxide Core/Shell Nanocrystals

Kriegner D, Sytnyk M, Groiss H, Yarema M, Grafeneder W, Walter P, Dippel AC, Meffert M, Gerthsen D, Stangl J, Heiß W, Heiß W (2016)

Publication Language: English

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2016

Journal

Journal of Physical Chemistry C American Chemical Society

Book Volume: 120

Pages Range: 19848-19855

Journal Issue: 35

DOI: 10.1021/acs.jpcc.6b06405

Abstract

While galvanic exchange is commonly applied to metallic nanoparticles, recently its applicability was expanded to metal-oxides. Here the galvanic exchange is studied in metal/metal-oxide core/shell nanocrystals. In particular Sn/SnO is treated by Ag, Pt, Pt, and Pd. The conversion dynamics is monitored by in situ synchrotron X-ray diffraction. The Ag treatment converts the Sn cores to the intermetallic AgSn (x ∼ 4) phase, by changing the core's crystal structure. For the analogous treatment by Pt, Pt, and Pd, such a galvanic exchange is not observed. This different behavior is caused by the semipermeability of the naturally formed SnO shell, which allows diffusion of Ag but protects the nanocrystal cores from oxidation by Pt and Pd ions.

Authors with CRIS profile

Wolfgang Heiß Department Werkstoffwissenschaften

Involved external institutions

Deutsches Elektronen-Synchrotron DESY DE Germany (DE) Johannes Kepler Universität (JKU) Linz AT Austria (AT) Karlsruhe Institute of Technology (KIT) DE Germany (DE)

How to cite

APA:

Kriegner, D., Sytnyk, M., Groiss, H., Yarema, M., Grafeneder, W., Walter, P.,... Heiß, W. (2016). Galvanic Exchange in Colloidal Metal/Metal-Oxide Core/Shell Nanocrystals. Journal of Physical Chemistry C, 120(35), 19848-19855. https://dx.doi.org/10.1021/acs.jpcc.6b06405

MLA:

Kriegner, Dominik, et al. "Galvanic Exchange in Colloidal Metal/Metal-Oxide Core/Shell Nanocrystals." Journal of Physical Chemistry C 120.35 (2016): 19848-19855.

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