Institute of Physics, University of Tartu, W. Ostwaldi 1, 50411, Tartu, Estonia.
Nanotechnology. 2017 Dec 15;28(50):505707. doi: 10.1088/1361-6528/aa973c.
The proper choice of coating materials and methods in core-shell nanowire (NW) engineering is crucial to assuring improved characteristics or even new functionalities of the resulting composite structures. In this paper, we have reported electron-beam-induced reversible elastic-to-plastic transition in Ag/AlO and Au/AlO NWs prepared by the coating of Ag and Au NWs with AlO by low-temperature atomic layer deposition. The observed phenomenon enabled freezing the bent core-shell NW at any arbitrary curvature below the yield strength of the materials and later restoring its initially straight profile by irradiating the NW with electrons. In addition, we demonstrated that the coating efficiently protects the core material from fracture and plastic yield, allowing it to withstand significantly higher deformations and stresses in comparison to uncoated NW.
在核壳纳米线（NW）工程中，适当选择涂层材料和方法对于确保改进复合材料结构的特性甚至赋予新功能至关重要。在本文中，我们通过低温原子层沉积在 Ag 和 Au NW 上包覆 AlO，报道了在 Ag/AlO 和 Au/AlO NW 中电子束诱导的可逆弹性到塑性的转变。所观察到的现象使得可以将任意曲率的弯曲核壳 NW 在低于材料屈服强度的情况下冻结，并通过电子束辐照将 NW 恢复到最初的直线形状。此外，我们证明了涂层可以有效地保护芯材免受断裂和塑性屈服的影响，从而使其能够承受比未涂层 NW 高得多的变形和应力。
