Kinetic study of Pt nanocrystal deposition on Ag nanowires with clean surfaces via galvanic replacement.

Nanoscale Research Letters
Yu-Lin ShenIn-Gann Chen

Abstract

Without using any templates or surfactants, this study develops a high-yield process to prepare vertical Ag-Pt core-shell nanowires (NWs) by thermally assisted photoreduction of Ag NWs and successive galvanic replacement between Ag and Pt ions. The clean surface of Ag nanowires allows Pt ions to reduce and deposit on it and forms a compact sheath comprising Pt nanocrystals. The core-shell structural feature of the NWs thus produced has been demonstrated via transmission electron microscopy observation and Auger electron spectroscopy elemental analysis. Kinetic analysis suggests that the deposition of Pt is an interface-controlled reaction and is dominated by the oxidative dissolution of Ag atoms. The boundaries in between Pt nanocrystals may act as microchannels for the transport of Ag ions during galvanic replacement reactions.

References

Aug 10, 2007·Journal of the American Chemical Society·Eric P LeeYounan Xia
Sep 1, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Grzegorz W Sławiński, Francis P Zamborini
Nov 15, 2007·Nano Letters·Yujiang SongJohn A Shelnutt
Jul 6, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Melinda MohlPulickel M Ajayan
Jun 22, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Mikhail LadanovAshok Kumar
Jun 30, 2011·Nanoscale Research Letters·Yu-Lin ShenIn-Gann Chen

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Citations

Jul 2, 2016·Chemical Reviews·Kyle D GilroyYounan Xia

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Methods Mentioned

BETA
transmission
X-ray
scanning electron microscopy
electron spectroscopy
electron diffraction

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