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

Dominik Kriegner; Mykhailo Sytnyk; Heiko Groiß; Maksym Yarema; Wolfgang Grafeneder; Peter Walter; Ann-Christin Dippel; Matthias Meffert; Dagmar Gerthsen; Julian Stangl; Wolfgang Johann Heiß

doi:10.1021/acs.jpcc.6b06405

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

Dominik Kriegner, Mykhailo Sytnyk, Heiko Groiß, Maksym Yarema, Wolfgang Grafeneder, Peter Walter, Ann-Christin Dippel, Matthias Meffert, Dagmar Gerthsen, Julian Stangl, Wolfgang Johann Heiß

Research output: Contribution to journal › Article › peer-review

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/SnO2 is treated by Ag+, Pt2+, Pt4+, and Pd2+. The conversion dynamics is monitored by in situ synchrotron X-ray diffraction. The Ag+ treatment converts the Sn cores to the intermetallic Ag x Sn (x ∼ 4) phase, by changing the core’s crystal structure. For the analogous treatment by Pt2+, Pt4+, and Pd2+, such a galvanic exchange is not observed. This different behavior is caused by the semipermeability of the naturally formed SnO2 shell, which allows diffusion of Ag+ but protects the nanocrystal cores from oxidation by Pt and Pd ions.

Original language	English
Pages (from-to)	19848–19855
Number of pages	8
Journal	The Journal of Physical Chemistry C
Volume	120
Issue number	35
DOIs	https://doi.org/10.1021/acs.jpcc.6b06405
Publication status	Published - 2016

Fields of science

103 Physics, Astronomy

JKU Focus areas

Nano-, Bio- and Polymer-Systems: From Structure to Function

Access to Document

10.1021/acs.jpcc.6b06405

Cite this

@article{81ee62da05f3488d93da7c14c95020f5,

title = "Galvanic Exchange in Colloidal Metal/Metal-Oxide Core/Shell Nanocrystals",

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/SnO2 is treated by Ag+, Pt2+, Pt4+, and Pd2+. The conversion dynamics is monitored by in situ synchrotron X-ray diffraction. The Ag+ treatment converts the Sn cores to the intermetallic Ag x Sn (x ∼ 4) phase, by changing the core{\textquoteright}s crystal structure. For the analogous treatment by Pt2+, Pt4+, and Pd2+, such a galvanic exchange is not observed. This different behavior is caused by the semipermeability of the naturally formed SnO2 shell, which allows diffusion of Ag+ but protects the nanocrystal cores from oxidation by Pt and Pd ions.",

author = "Dominik Kriegner and Mykhailo Sytnyk and Heiko Groi{\ss} and Maksym Yarema and Wolfgang Grafeneder and Peter Walter and Ann-Christin Dippel and Matthias Meffert and Dagmar Gerthsen and Julian Stangl and Hei{\ss}, \{Wolfgang Johann\}",

year = "2016",

doi = "10.1021/acs.jpcc.6b06405",

language = "English",

volume = "120",

pages = "19848–19855",

journal = "The Journal of Physical Chemistry C",

issn = "1932-7455",

publisher = "ACS Publications",

number = "35",

}

TY - JOUR

T1 - Galvanic Exchange in Colloidal Metal/Metal-Oxide Core/Shell Nanocrystals

AU - Kriegner, Dominik

AU - Sytnyk, Mykhailo

AU - Groiß, Heiko

AU - Yarema, Maksym

AU - Grafeneder, Wolfgang

AU - Walter, Peter

AU - Dippel, Ann-Christin

AU - Meffert, Matthias

AU - Gerthsen, Dagmar

AU - Stangl, Julian

AU - Heiß, Wolfgang Johann

PY - 2016

Y1 - 2016

N2 - 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/SnO2 is treated by Ag+, Pt2+, Pt4+, and Pd2+. The conversion dynamics is monitored by in situ synchrotron X-ray diffraction. The Ag+ treatment converts the Sn cores to the intermetallic Ag x Sn (x ∼ 4) phase, by changing the core’s crystal structure. For the analogous treatment by Pt2+, Pt4+, and Pd2+, such a galvanic exchange is not observed. This different behavior is caused by the semipermeability of the naturally formed SnO2 shell, which allows diffusion of Ag+ but protects the nanocrystal cores from oxidation by Pt and Pd ions.

AB - 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/SnO2 is treated by Ag+, Pt2+, Pt4+, and Pd2+. The conversion dynamics is monitored by in situ synchrotron X-ray diffraction. The Ag+ treatment converts the Sn cores to the intermetallic Ag x Sn (x ∼ 4) phase, by changing the core’s crystal structure. For the analogous treatment by Pt2+, Pt4+, and Pd2+, such a galvanic exchange is not observed. This different behavior is caused by the semipermeability of the naturally formed SnO2 shell, which allows diffusion of Ag+ but protects the nanocrystal cores from oxidation by Pt and Pd ions.

UR - https://www.scopus.com/pages/publications/84986198523

U2 - 10.1021/acs.jpcc.6b06405

DO - 10.1021/acs.jpcc.6b06405

M3 - Article

SN - 1932-7455

VL - 120

SP - 19848

EP - 19855

JO - The Journal of Physical Chemistry C

JF - The Journal of Physical Chemistry C

IS - 35

ER -

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

Abstract

Fields of science

JKU Focus areas

Access to Document

Other files and links

Cite this