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Their discovery implies that oxidation in low-dimension metallic glass can result in unique properties for applications in sensors, medical devices and other nanodevices.

In-situ microcompression measurements also revealed that the severely oxidized metallic glass nanotubes and nanosheets exhibited a recoverable strain of 10-20%, which was several times more than that of most conventional superelastic metals, such as shape memory alloys and gum metals.

Therefore, Professor Yang and his team investigated oxidation in nanometals, and in sharp contrast to their expectation, they found that severely oxidized metallic glass nanotubes and nanosheets can attain an ultrahigh recoverable elastic strain of up to about 14% at room temperature, which outperforms bulk metallic glasses, metallic glass nanowires, and many other super-elastic metals.

They made metallic glass nanotubes with an average wall thickness of just 20nm, and fabricated nanosheets from different substrates, such as sodium chloride, polyvinyl alcohol and conventional photoresist substrates, with different levels of oxygen concentration.

In both the results, oxides were dispersed within the metallic glass nanotubes and nanosheets, unlike conventional bulk metals, in which a solid oxide layer forms on the surface.