Copper Core鈥揚orous Manganese Oxide Shell Nanoparticles

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• 作者：Nachal D. Subramanian ; Juana Moreno ; James J. Spivey ; Challa S.S.R. Kumar
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：August 4, 2011
• 年：2011
• 卷：115
• 期：30
• 页码：14500-14506
• 全文大小：931K
• 年卷期：v.115,no.30(August 4, 2011)
• ISSN：1932-7455

文摘

Core鈥搒hell nanoparticles, especially those with nanoporous oxide shells, exhibit chemical and physical properties that are distinct from those of the bulk materials due to the atomic-level proximity and morphology of the core and shell atoms. Here, we demonstrate a wet-chemical method for the synthesis of Cu core (6.1 nm)鈥損orous Mn₃O₄ shell (3.4 nm thick) nanoparticles. Various characterization techniques, including synchrotron radiation-based small-angle X-ray scattering (SAXS) and X-ray absorption near edge structure (XANES) tools, confirm the core鈥搒hell structure. Both the chemical and physical properties of these Cu-based nanoparticles are influenced by the Mn₃O₄ shell. For example, the magnetic properties of the core鈥搒hell particles are found to be similar to those of Mn₃O₄ nanoparticles reported in the literature. Diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) results demonstrate that these materials are catalytically active for CO adsorption and hydrogenation.