はく離ナノシートをビルディングブロックに用いた機能性ナノ構造材料の創製(第60回日本セラミックス協会学術賞受賞研究総説)

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A variety of layered transition metal oxides and layered double hydroxides have been exfoliated into unilamellar nanosheets such as Ti_<0.91>O_2, Ca_2Nb_3O_<10>, MnO_2, and M_<1-x>^<II>Al_x(OH)_2 (M^<II>=Mg, Co, Zn, Ni). The exfoliation was promoted via the high degree of swelling driven by intercalation of quaternary ammonium ions for the layered oxides and solvation with formamide for the hydroxides. Various characterizations revealed very high two-dimensional anisotropy for the nanosheets thus obtained; a thickness of around 1nm vs. a lateral size of submicrometers or larger. These nanosheets can be assembled or organized through various solution-phase processings to produce a range of nanostructured materials. Addition of electrolytes into a colloidal suspension of nanosheets promotes their restacking, yielding a flocculate. The combination of nanosheets and some counterions through this route led to a range of nanocomposites which exhibited fluorescent, photocatalytic, and electrochemical properties. On the other hand, the nanosheets can be deposited layer-by-layer with suitable polyelectrolytes to produce multilayer ultrathin films, in which the nanoarchitecture can be precisely controlled. The multilayer films of Ti_<0.91>O_2 and MnO_2 nanosheets showed photoinduced superhydrophilicity and electrochromic properties, respectively. Furthermore, the films of ferromagnetic titania nanosheets such as Ti_<0.8>Co_<0.2>O_2 and Ti_<0.6>Fe_<0.4>O_2 were found to show very high magneto-optical properties at room temperature.
2007-01-01

はく離ナノシートをビルディングブロックに用いた機能性ナノ構造材料の創製(第60回日本セラミックス協会学術賞受賞研究総説)

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