In this article, another thin film named white graphene is introduced, containing its properties, preparation and potential
applications. White graphene, which has the same structure with graphene but quite different electrical properties, can be
exfoliated from its layered crystal, hexagonal boron nitride. Here two preparation methods of white graphene including
supersonic cleavage and supercritical cleavage are presented. Inspired by the cleavage of graphene oxide, supersonic is
applied to BN and few-layered films are obtained. Compared with supersonic cleavage, supercritical cleavage proves to
be more successful. As supercritical fluid can diffuse into interlayer space of the layered hexagonal boron nitride easily,
once reduce the pressure of the supercritical system fast, supercritical fluid among layers expands and escapes form
interlayer, consequently exfoliating the hexagonal boron nitride into few layered structure. A series of characterization
demonstrate that the monolayer white graphene prepared in the process matches its theoretical thickness 0.333nm and
has lateral sizes at the order of 10μm. Supercritical cleavage proves to be successful and shows many advantages, such as
good production quality and fast production cycle. Furthermore, the band energy of white graphene, which shows quite
different from graphene, is simulated via tight-bonding in theory. The excellent properties will lead to extensive
applications of white graphene. As white graphene has not received enough concern and exploration, it’s potential to
play a significant role in the fields of industry and science.
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