A Mechanism Study on the Synthesis of Cu/Pd Nanoparticles with Citric Complexing Agent

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• 作者：Sylvia H. Y. Lo ; Tsan-Yao Chen ; Yung-Yun Wang ; Chi-Chao Wan ; Jyh-Fu Lee ; Tsang-Lang Lin
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：September 6, 2007
• 年：2007
• 卷：111
• 期：35
• 页码：12873 - 12876
• 全文大小：196K
• 年卷期：v.111,no.35(September 6, 2007)
• ISSN：1932-7455

文摘

We have previously synthesized Cu/Pd nanoparticles with a citric complexing agent, demonstrating well thesuspension and high catalytic ability of electroless copper deposition. Herein, we report the in situ investigationof the synthesis of Cu/Pd nanoparticles with a citric complexing agent by X-ray absorption near-edge structure(XANES). By characterizing the XANES spectra of Cu and Pd upon the stepwise addition of an alkalinesolution, the reaction mechanism of Cu as well as Pd complexing ions was elucidated. Slow reduction of Pdions and fast reduction of Cu ions induced by zerovalent Pd are found in XANES spectra. A three-stageformation mechanism of Cu/Pd nanoparticles was proposed in which a Pd reduction initial stage, a Cu-dominated reduction middle stage, and a Pd-dominated reduction final stage were indicated. As a result, aPd-rich outer shell formed on the surface of synthesized Cu/Pd particles in the final stage. In summary, theformation mechanism and the Pd-rich outer shell structure of synthesized Cu/Pd nanoparticles were found inthis citric complexing agent synthesis method.