Shape Restoration Effect in Ag鈥揝iO2 Core鈥揝hell Nanowires

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• 作者：Sergei Vlassov ; Boris Polyakov ; Leonid M. Dorogin ; Mikk Vahtrus ; Magnus Mets ; Mikk Antsov ; Rando Saar ; Alexey E. Romanov ; Ants L玫hmus ; R眉nno L玫hmus
• 刊名：Nano Letters
• 出版年：2014
• 出版时间：September 10, 2014
• 年：2014
• 卷：14
• 期：9
• 页码：5201-5205
• 全文大小：241K
• ISSN：1530-6992

文摘

The combination of two different materials in a single composite core鈥搒hell heterostructure can lead to improved or even completely novel properties. In this work we demonstrate the enhancement of the mechanical properties of silver (Ag) nanowires (NW) achieved by coating them with a silica (SiO₂) shell. In situ scanning electron microscope (SEM) nanomechanical tests of Ag鈥揝iO₂ core鈥搒hell nanowires reveal an improved fracture resistance and an electron-beam induced shape restoration effect. In addition, control experiments are conducted separately on uncoated Ag NWs and on empty SiO₂ shells in order to gain deeper insight into the peculiar properties of Ag鈥揝iO₂. Test conditions are simulated using finite-element methods; possible mechanisms responsible for the shape restoration and the enhanced fracture resistance are discussed.

Keywords:

Core鈭抯hell nanowires; mechanical properties; shape restoration; electron beam; scanning electron microscopy