Titanium Oxide Nanosheets: Graphene Analogues with Versatile Functionalities

Lianzhou Wang and Takayoshi Sasaki

Chem. Rev.,   Article ASAP

Titanium oxide (TiO2) has been among the most studied material systems over the past few decades due to its low cost, chemical stability, nontoxicity, and, more importantly, multifunctionalities in catalysis, photocatalysis, electronics, photovoltaic, and biomedical applications.Structurally, TiO2 has a number of polymorphs, of which anatase, rutile, and brookite are the most commonly investigated structures. Recent studies have also revealed some interesting properties in less studied polymorphs; for example, the cubic cotunnite-type phase is the hardest known oxide and metastable monoclinic TiO2 (B)-type phase owes excellent photo- and electrochemical properties.In addition to these well-documented structures titanium oxide can also be derived from the exfoliation of some Ti−O-bearing layered compounds to offer a unique twodimensional (2D) anisotropy, which is the focus of this article.


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