Desorption of surfactant and sintering of surface-modified Pd x Ni 1 - x nanoparticles

Kuan Wen Wang, Shu Ru Chung, Wei Hsiu Hung, Tsong P. Perng

研究成果: 雜誌貢獻期刊論文同行評審

6 引文 斯高帕斯(Scopus)

摘要

A series of Pd x Ni 1 - x nanoparticles in a diameter of 6-7 nm were prepared by wet chemical reduction. They were then modified with two surfactants, stearic acid (SA) and polyethylene glycol (PEG). Desorption of the surfactant was studied using a temperature programmed desorption technique, and the sintering behavior of surface-modified Pd x Ni 1 - x nanoparticles was examined. Since surface energy of the nanoparticles depends on the alloy composition, it can be correlated with the desorption temperature of surfactant from the nanoparticle surface. Because Ni has a higher surface energy, the surfactant desorption temperature increases as the Ni content increases. With the same stoichiometry, the desorption temperature of SA is always higher than that of PEG. The SA-modified nanoparticles have higher thermal stability and are less sintered than PEG-modified nanoparticles. The sintering and growth behavior of the nanoparticles can be correlated with variation of surface energy due to different surface modification.

原文???core.languages.en_GB???
頁(從 - 到)8751-8755
頁數5
期刊Applied Surface Science
252
發行號24
DOIs
出版狀態已出版 - 15 10月 2006

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