Effect of surface modification on de-alloying of Pd70Ag30 nanoparticles

Kuan Wen Wang; Shu Ru Chung; Ling Yun Jang; Jyh Fu Lee; Tsong Pyng Perng

doi:10.1016/j.jallcom.2006.02.023

Effect of surface modification on de-alloying of Pd₇₀Ag₃₀ nanoparticles

Kuan Wen Wang, Shu Ru Chung, Ling Yun Jang, Jyh Fu Lee, Tsong Pyng Perng

Graduate Institute of Materials Science and Engineering

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

Abstract

Heating of surface modified Pd₇₀Ag₃₀ alloy nanoparticle pellets in air was conducted and the effect of surface modification on selective oxidation of Pd and surface segregation of Ag on the surface was examined. For unmodified nanoparticles at 250 °C, free Ag was observed because of preferential oxidation of Pd. Modification with stearic acid reduced the degree of oxidation and the amount of free Ag. With polyethylene glycol, the oxidation of Pd was further suppressed. No free Ag was formed on the pellet surface, instead, more segregation of Ag within the alloy nanoparticles to the surface occurred. The effectiveness of these two surfactants gradually diminished at 350 °C.

Original language	English
Pages (from-to)	341-344
Number of pages	4
Journal	Journal of Alloys and Compounds
Volume	426
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jallcom.2006.02.023
State	Published - 21 Dec 2006

Keywords

PdAg nanoparticles
Polyethylene glycol
Stearic acid
Surface modification

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10.1016/j.jallcom.2006.02.023

Cite this

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title = "Effect of surface modification on de-alloying of Pd70Ag30 nanoparticles",

abstract = "Heating of surface modified Pd70Ag30 alloy nanoparticle pellets in air was conducted and the effect of surface modification on selective oxidation of Pd and surface segregation of Ag on the surface was examined. For unmodified nanoparticles at 250 °C, free Ag was observed because of preferential oxidation of Pd. Modification with stearic acid reduced the degree of oxidation and the amount of free Ag. With polyethylene glycol, the oxidation of Pd was further suppressed. No free Ag was formed on the pellet surface, instead, more segregation of Ag within the alloy nanoparticles to the surface occurred. The effectiveness of these two surfactants gradually diminished at 350 °C.",

keywords = "PdAg nanoparticles, Polyethylene glycol, Stearic acid, Surface modification",

author = "Wang, {Kuan Wen} and Chung, {Shu Ru} and Jang, {Ling Yun} and Lee, {Jyh Fu} and Perng, {Tsong Pyng}",

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 - Effect of surface modification on de-alloying of Pd70Ag30 nanoparticles

AU - Wang, Kuan Wen

AU - Chung, Shu Ru

AU - Jang, Ling Yun

AU - Lee, Jyh Fu

AU - Perng, Tsong Pyng

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 - 2006/12/21

Y1 - 2006/12/21

N2 - Heating of surface modified Pd70Ag30 alloy nanoparticle pellets in air was conducted and the effect of surface modification on selective oxidation of Pd and surface segregation of Ag on the surface was examined. For unmodified nanoparticles at 250 °C, free Ag was observed because of preferential oxidation of Pd. Modification with stearic acid reduced the degree of oxidation and the amount of free Ag. With polyethylene glycol, the oxidation of Pd was further suppressed. No free Ag was formed on the pellet surface, instead, more segregation of Ag within the alloy nanoparticles to the surface occurred. The effectiveness of these two surfactants gradually diminished at 350 °C.

AB - Heating of surface modified Pd70Ag30 alloy nanoparticle pellets in air was conducted and the effect of surface modification on selective oxidation of Pd and surface segregation of Ag on the surface was examined. For unmodified nanoparticles at 250 °C, free Ag was observed because of preferential oxidation of Pd. Modification with stearic acid reduced the degree of oxidation and the amount of free Ag. With polyethylene glycol, the oxidation of Pd was further suppressed. No free Ag was formed on the pellet surface, instead, more segregation of Ag within the alloy nanoparticles to the surface occurred. The effectiveness of these two surfactants gradually diminished at 350 °C.

KW - PdAg nanoparticles

KW - Polyethylene glycol

KW - Stearic acid

KW - Surface modification

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U2 - 10.1016/j.jallcom.2006.02.023

DO - 10.1016/j.jallcom.2006.02.023

M3 - 期刊論文

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VL - 426

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EP - 344

JO - Journal of Alloys and Compounds

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