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We describe a catalyst-free vapor-solid synthesis of bismuth selenide(Bi2Se3) nanostructures at ambient pressure with hydrogen as a carrier gas. Thenanostructures were synthesized on glass, silicon and mica substrates and themethod yields a variety of nanostructures: nanowires, nanoribbons,nanoplatelets and nanoflakes. The materials analysis shows high chemical purityin all cases, without sacrificing the crystalline structure of Bi2Se3.Low-temperature measurements of the nanostructures indicate contributions fromthe surface states with a tunable carrier density. Samples synthesized onflexible mica substrates show no significant change in resistance upon bending,indicating robustness of as-grown Bi2Se3 nanostructures and their suitabilityfor device applications.

Substrate-Independent Catalyst-Free Synthesis of High-Purity Bi2Se3 Nanostructures