| Co-Investigator(Kenkyū-buntansha) |
SUGIMOTO Wataru Shinshu University, Department of Fine Materials Engineering, Research Associate, 繊維学部, 助手 (20313843)
KURODA Kazuyuki Waseda University, School of Science and Engineering, Professor, 理工学部, 教授 (90130872)
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| Research Abstract |
Preparation of new protonated layered perivskite
Since the number of layered perovskits is very limited, we found a novel route to prtonated layered perovskites. Aurivillius phases (Bi_2O_2[A_<n-1>B_nO_<3n+1>] ; n=3, A=(Sr, Na), B=Nb ; n=2, A=Sr, B=Ta ; n=2, without A-ions, B=W) were acid-treated at room temperature. Bismuth oxide sheets were selectively leached, and the structures of perovskite-like slabs were retained. For charge compensation, protons were introduced to form protonated layered perovskites with new compositions.
Preparation of inorganic-organic hybrids
Layered perovskite H[LaNb_2O_7] with interlayer surface modifled with alkoxyl groups was prepared. Using n-alkoxyl derivatives as intermediates, H[LaNb_2O_7] can be modified with various alcohols. In a similar fashion, H[LaNb_2O_7] can be modified with silanol-terminated poly(dimetylsiloxane) (HO(SiMe_2O)_mH).
Preparation of intercalation compounds
H_<1.8>[Bi_<0.2>Sr_<0.8>Nb_2O_7] prepared via selective leaching from an Aurivillius phase Bi_2SrTa_2O_9 was allowed to react with n-alkylamines. All the n-alkylamines can form intercalation compounds via an acid-base reaction.
Ptotochromism upon UV irradiation
A methoxyl derivative of H[LaNb_2O_7] turned brue when it was irradiated with UV light. The blue color vanished gradually in air, but it can develop again upon UV irradiation. The electrical resistivity of the colored sample was significantly larger than that of the uncolored sample.
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