sp to sp Phase Transformation in Graphene-Like Nanofilms

Authored by: Long Yuan , Zhenyu Li , Jinlong Yang

Graphene Science Handbook

Print publication date:  April  2016
Online publication date:  April  2016

Print ISBN: 9781466591370
eBook ISBN: 9781466591387
Adobe ISBN:

10.1201/b19461-11

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Abstract

Due to its unique electronic structure, graphene has become a widely studied new material. It is desirable to enrich the physics and chemistry of graphene-based materials by electronic structure engineering. An important property-tuning means is introducing an sp2 to sp3 phase transformation. In this chapter, first-principles studies of functionalization induced sp2 to sp3 phase transformations of graphene-like nanofilm are reviewed. Diamondized graphene bilayer and graphene–BN hybrid bilayer have a tunable electronic structure, from magnetic semiconductor to nonmagnetic metal. More interestingly, hydrogenated wurtzite SiC nanofilm is a two-dimensional bipolar magnetic semiconductor material, where its spin polarization can be conveniently controlled by a gate voltage. The tunable electronic and magnetic properties demonstrated here pave new avenues to construct graphene-based electronics and spintronics devices.

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