3 years ago

Enhanced Flexibility and Electron Beam-controlled Shape Recovery in Alumina-Coated Au and Ag Core-Shell Nanowires.

Sven Oras, Jaan Aarik, Mikk Vahtrus, Magnus Mets, Boris Polyakov, Sergei Vlassov, Rünno Lõhmus, Mikk Antsov, Tõnis Arroval, Aivar Tarre
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/Al2O3 and Au/Al2O3 NWs prepared by coating of Ag and Au NWs with Al2O3 by low temperature atomic layer deposition. The observed phenomenon enabled freezing the bent core-shell NW at any arbitral 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 core material from fracture and plastic yield, allowing it to withstand significantly higher deformations and stresses in comparison to uncoated NW.

Publisher URL: http://doi.org/10.1088/1361-6528/aa973c

DOI: 10.1088/1361-6528/aa973c

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