Selective oxidation of Pd and compositional reconstruction in Pd70Ag30 alloy nanoparticles

Kuan Wen Wang; Shu Ru Chung; Tsong P. Perng

doi:10.1016/j.jallcom.2005.08.065

Selective oxidation of Pd and compositional reconstruction in Pd₇₀Ag₃₀ alloy nanoparticles

Kuan Wen Wang, Shu Ru Chung, Tsong P. Perng

Graduate Institute of Materials Science and Engineering

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

8 Scopus citations

Abstract

The Pd₇₀Ag₃₀ alloy nanoparticles were heated in air at 250-450 °C. During heating, segregation of Ag to the surface driven by its lower surface energy competes with the oxidation of Pd. At 250 °C, selective oxidation of Pd occurred preferentially, and the formation of large free Ag crystallites was observed. As temperature increased, oxidation of Pd became more intensive and dominating, which attracted more Pd to the surface for reaction, resulting in fewer and smaller free Ag particles on the surface.

Original language	English
Pages (from-to)	60-62
Number of pages	3
Journal	Journal of Alloys and Compounds
Volume	417
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jallcom.2005.08.065
State	Published - 29 Jun 2006

Keywords

Nanocrystalline materials
Oxidation
Palladium
Silver

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10.1016/j.jallcom.2005.08.065

Cite this

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title = "Selective oxidation of Pd and compositional reconstruction in Pd70Ag30 alloy nanoparticles",

abstract = "The Pd70Ag30 alloy nanoparticles were heated in air at 250-450 °C. During heating, segregation of Ag to the surface driven by its lower surface energy competes with the oxidation of Pd. At 250 °C, selective oxidation of Pd occurred preferentially, and the formation of large free Ag crystallites was observed. As temperature increased, oxidation of Pd became more intensive and dominating, which attracted more Pd to the surface for reaction, resulting in fewer and smaller free Ag particles on the surface.",

keywords = "Nanocrystalline materials, Oxidation, Palladium, Silver",

author = "Wang, {Kuan Wen} and Chung, {Shu Ru} and Perng, {Tsong P.}",

note = "Funding Information: We acknowledge the support of this work by the Ministry of Education of Taiwan under Contract no. A-91-E-FA04-1-4 and National Science Council of Taiwan under Contract no. NSC-91-2120-E-007-003.",

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T1 - Selective oxidation of Pd and compositional reconstruction in Pd70Ag30 alloy nanoparticles

AU - Wang, Kuan Wen

AU - Chung, Shu Ru

AU - Perng, Tsong P.

N1 - Funding Information: We acknowledge the support of this work by the Ministry of Education of Taiwan under Contract no. A-91-E-FA04-1-4 and National Science Council of Taiwan under Contract no. NSC-91-2120-E-007-003.

PY - 2006/6/29

Y1 - 2006/6/29

N2 - The Pd70Ag30 alloy nanoparticles were heated in air at 250-450 °C. During heating, segregation of Ag to the surface driven by its lower surface energy competes with the oxidation of Pd. At 250 °C, selective oxidation of Pd occurred preferentially, and the formation of large free Ag crystallites was observed. As temperature increased, oxidation of Pd became more intensive and dominating, which attracted more Pd to the surface for reaction, resulting in fewer and smaller free Ag particles on the surface.

AB - The Pd70Ag30 alloy nanoparticles were heated in air at 250-450 °C. During heating, segregation of Ag to the surface driven by its lower surface energy competes with the oxidation of Pd. At 250 °C, selective oxidation of Pd occurred preferentially, and the formation of large free Ag crystallites was observed. As temperature increased, oxidation of Pd became more intensive and dominating, which attracted more Pd to the surface for reaction, resulting in fewer and smaller free Ag particles on the surface.

KW - Nanocrystalline materials

KW - Oxidation

KW - Palladium

KW - Silver

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M3 - 期刊論文

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