Variation of surface composition and sintering of binary Pd70Ag30 nanoparticles

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

doi:10.1016/j.jallcom.2005.06.081

Variation of surface composition and sintering of binary 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

7 Scopus citations

Abstract

The variation of surface composition and sintering of the binary Pd₇₀Ag₃₀ nanoparticles prepared by chemical reduction were studied. The composition of the as-prepared Pd₇₀Ag₃₀ nanoparticles across the diameter is inhomogeneous due to different reduction potentials of Pd and Ag. Upon heating, Ag will migrate to the surface because of its lower surface energy. Surface modification results in variation of surface composition during the sintering process. Stearic acid acts as a grain growth inhibitor. The migration of Ag to the surface is suppressed and the sintering is retarded. Modification by polyethylene glycol leads to more migration of Ag atoms from the core to the surface. This makes the nanoparticles easier to sinter.

Original language	English
Pages (from-to)	62-65
Number of pages	4
Journal	Journal of Alloys and Compounds
Volume	415
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jallcom.2005.06.081
State	Published - 18 May 2006

Keywords

ESCA
Nanoparticles
Pd-Ag
Polyethylene glycol
Sintering
Stearic acid
Surfactant
XANES

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10.1016/j.jallcom.2005.06.081

Cite this

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title = "Variation of surface composition and sintering of binary Pd70Ag30 nanoparticles",

abstract = "The variation of surface composition and sintering of the binary Pd70Ag30 nanoparticles prepared by chemical reduction were studied. The composition of the as-prepared Pd70Ag30 nanoparticles across the diameter is inhomogeneous due to different reduction potentials of Pd and Ag. Upon heating, Ag will migrate to the surface because of its lower surface energy. Surface modification results in variation of surface composition during the sintering process. Stearic acid acts as a grain growth inhibitor. The migration of Ag to the surface is suppressed and the sintering is retarded. Modification by polyethylene glycol leads to more migration of Ag atoms from the core to the surface. This makes the nanoparticles easier to sinter.",

keywords = "ESCA, Nanoparticles, Pd-Ag, Polyethylene glycol, Sintering, Stearic acid, Surfactant, XANES",

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

note = "Funding Information: This work was supported 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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AU - Wang, Kuan Wen

AU - Chung, Shu Ru

AU - Jang, Ling Yun

AU - Lee, Jyh Fu

AU - Perng, Tsong Pyng

N1 - Funding Information: This work was supported 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 - 2006/5/18

Y1 - 2006/5/18

N2 - The variation of surface composition and sintering of the binary Pd70Ag30 nanoparticles prepared by chemical reduction were studied. The composition of the as-prepared Pd70Ag30 nanoparticles across the diameter is inhomogeneous due to different reduction potentials of Pd and Ag. Upon heating, Ag will migrate to the surface because of its lower surface energy. Surface modification results in variation of surface composition during the sintering process. Stearic acid acts as a grain growth inhibitor. The migration of Ag to the surface is suppressed and the sintering is retarded. Modification by polyethylene glycol leads to more migration of Ag atoms from the core to the surface. This makes the nanoparticles easier to sinter.

AB - The variation of surface composition and sintering of the binary Pd70Ag30 nanoparticles prepared by chemical reduction were studied. The composition of the as-prepared Pd70Ag30 nanoparticles across the diameter is inhomogeneous due to different reduction potentials of Pd and Ag. Upon heating, Ag will migrate to the surface because of its lower surface energy. Surface modification results in variation of surface composition during the sintering process. Stearic acid acts as a grain growth inhibitor. The migration of Ag to the surface is suppressed and the sintering is retarded. Modification by polyethylene glycol leads to more migration of Ag atoms from the core to the surface. This makes the nanoparticles easier to sinter.

KW - ESCA

KW - Nanoparticles

KW - Pd-Ag

KW - Polyethylene glycol

KW - Sintering

KW - Stearic acid

KW - Surfactant

KW - XANES

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