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Abstract 

We have produced a variety of 2D nanosheets by exfoliating layered transition metal oxides into colloidal single layers. Osmotic swelling induced by reaction with aqueous amine solutions to homogeneously prop the interlayer gallery up to a hundred times is a key step for high-yield production of unilamellar nanosheets. The resulting 2D oxide crystals have a molecularly thin morphology, which is similar to graphene. On the other hand, these nanosheets are characterized by their rich varieties in composition and structure, which leads to a range of functionalities. For example, Ti or Nb oxide nano sheets of Ti_1-dO₂^4d- and Ca₂Nb₃O₁₀^- work as wide-gap semiconductors, showing photocatalytic property, while Mn- or W-based oxide nanosheets such as MnO₂^0.4- and Cs₂W₁₁O₃₆^2- show redox activity and chromic property. 

These nanosheets are useful as a building block to be assembled into various nanostructures such as nanocomposites, nanofilms and hydrogels [1,2,5]. Particularly, solution-based processes involving sequential adsorption and Langmuir-Blodgett deposition are powerful to tailor precisely organized nanostructured films. Versatile function design, for example, photochemical energy storage, high-k dielectrics, can be achieved by this approach.

References

[1] R. Ma and T. Sasaki, Adv. Mater. 22, (2010) 5082. 

[2] L. Z. Wang and T. Sasaki, Chem. Rev. ASAP article (DOI: 10.1021/cr400627u).

[3] F. Geng, R. Ma, A. Nakamura, K. Akatsuka, Y. Ebina, Y. Yamauchi, N. Miyamoto, and T. Sasaki, Nat. Commun. 4 (2013) 1632.

[4] F. Geng, R. Ma, Y. Ebina, Y. Yamauchi, N. Miyamoto, and T. Sasaki, J. Am. Chem. Soc. 136 (2014) 5491.

[5] M. Osada and T. Sasaki, Adv. Mater. 24 (2012) 210.

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