Thermal stability of {1 1 0} facet terminated gold nanobelts

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• 作者：Ying Chen^a ; Srdjan Milenkovic^a ; ^c ; Achim Walter Hassel^a ; ^b ; ^{hassel@elchem.de}
• 关键词：Gold nanobelts ; Metal nanowires ; Thermal stability ; Rayleigh instabilities
• 刊名：Applied Surface Science
• 出版年：2012
• 出版时间：15 June, 2012
• 年：2012
• 卷：258
• 期：17
• 页码：6224-6231
• 全文大小：1594 K

文摘

A precise knowledge and understanding of the thermal stability of nanowires is a prerequisite for the reliable implementation of nanowire-based devices. Single crystalline Au nanobelts with {1 1 0} surface either in free standing arrays with identical crystallographic orientation or lying on the substrate were prepared by a combination of directional eutectoid decomposition followed by phase selective etching process. The thermal stability in the temperature range 500-700 ¡ãC of the obtained free standing and lying Au nanobelts were investigated in situ with a scanning electron microscope equipped with a high temperature stage. The results suggested that free standing Au nanobelts undergo morphological evolution in a different way compared with the substrate contacted lying Au nanobelts. The free standing Au nanobelts broke more easily and decayed into a chain of nanospheres following Rayleigh instability after the belt morphology changed into cylindrical wires; whereas the Au nanobelts lying on the substrate decayed into irregular particles. These findings clearly support a surface energy minimization driven mechanism. Only after transformation into a mainly {1 1 1} terminated structure formation of Rayleigh instabilities are observed.