Controlling the Formation of Nanocavities in Kirkendall Nanoobjects through Sequential Thermal Ex Situ Oxidation and In Situ Reduction Reactions

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• 作者：Abdel-Aziz El Mel ; Pierre-Yves Tessier ; Marie Buffiere ; Eric Gautron ; JunJun Ding ; Ke Du ; Chang-Hwan Choi ; Stephanos Konstantinidis ; Rony Snyders ; Carla Bittencourt and Leopoldo Molina-Luna
• 刊名：Small
• 出版年：2016
• 出版时间：June 1, 2016
• 年：2016
• 卷：12
• 期：21
• 页码：2885-2892
• 全文大小：1207K
• ISSN：1613-6829

文摘

Controlling the porosity, the shape, and the morphology of Kirkendall hollow nanostructures is the key factor to tune the properties of these tailor-made nanomaterials which allow in turn broadening their applications. It is shown that by applying a continuous oxidation to copper nanowires following a temperature ramp protocol, one can synthesize cuprous oxide nanotubes containing periodic copper nanoparticles. A further oxidation of such nanoobjects allows obtaining cupric oxide nanotubes with a bamboo-like structure. On the other hand, by applying a sequential oxidation and reduction reactions to copper nanowires, one can synthesize hollow nanoobjects with complex shapes and morphologies that cannot be obtained using the Kirkendall effect alone, such as necklace-like cuprous oxide nanotubes, periodic solid copper nanoparticles or hollow cuprous oxide nanospheres interconnected with single crystal cuprous oxide nanorods, and aligned and periodic hollow nanospheres embedded in a cuprous oxide nanotube. The strategy demonstrated in this study opens new avenues for the engineering of hollow nanostructures with potential applications in gas sensing, catalysis, and energy storage.