Bi2Se3, is a 2D layered material that can be chemically tailored through intercalation of zero valent metals. Intercalation can lead to an entire host of temperature and concentration-dependent polytypic phase transitions associated with superlattice formation and order-disorder transitions. I will present the temperature and concentration dependent phase diagrams of zero-valent Cu, Co, and Fe intercalated bismuth selenide using in-situ transmission electron microscopy. Dual-element intercalants of CuCo, CuFe, and CoFe-Bi2Se3 will also be presented. Hexagonal and striped domain formation consistent with two-dimensional ordering of the intercalant and Pokrovksy-Talapov theory is identified. These studies provide a complete picture of the structural behavior of metal intercalated Bi2Se3 and a basis for the systematic development of 2D materials with specific structures (and hence specific properties) for future applications.

Polytypic phase transitions in metal intercalated 2D Bi2Se3 nanoribbons

253rd National Meeting (2017)

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