Topological Insulator Bi2Se3 Nanostructures for Transparent Flexible Electrodes

This informal in-lab video shows several different samples of bismuth selenide (Bi2Se3) formed atop thin mica insulator substrates as they are tested for conductivity before and after flexing.

In the first segment, the transparency of the sample is displayed by placing it on a piece of paper showing the Chinese characters for "topological insulator."

In the second segment, the material's conductivity is essentially unchanged when flexed.

In the third segment, some 60 cycles of deep flexing causes only a very small change in the material's conductivity. The researchers also used a mechanical rig (not shown) to bend the material 1,000 times reproducibly, after which the material still showed minimal deterioration in conductivity.

(Video by Hailin Peng, Peking University.)

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