Water-Soluble Pd Nanoparticles Capped with Glutathione: Synthesis, Characterization, and Magnetic Properties

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• 作者：Sachil Sharma ; Bit Kim ; Dongil Lee
• 刊名：Langmuir
• 出版年：2012
• 出版时间：November 13, 2012
• 年：2012
• 卷：28
• 期：45
• 页码：15958-15965
• 全文大小：578K
• 年卷期：v.28,no.45(November 13, 2012)
• ISSN：1520-5827

文摘

The synthesis, characterization, and magnetic properties of water-soluble Pd nanoparticles capped with glutathione are described. The glutathione-capped Pd nanoparticles were synthesized under argon and air atmospheres at room temperature. Whereas the former exhibits a bulklike lattice parameter, the lattice parameter of the latter is found to be considerably greater, indicating anomalous lattice expansion. Comparative structural and compositional studies of these nanoparticles suggest the presence of oxygen in the core lattice when Pd nanoparticles are prepared under an air atmosphere. Both Pd nanoparticles prepared under argon and air show ferromagnetism at 5 K, but the latter exhibits significantly greater coercivity (88 Oe) and magnetization (0.09 emu/g at 50 kOe). The enhanced ferromagnetic properties are explained by the electronic effect of the incorporated oxygen that increases the 4d density of holes at the Pd site and localizes magnetic moments.