Preparation of Layered Perovskite-Organic Composites and their Application to Photo-induced Electroconduction

新型质子化层状钙钛矿的制备由于层状钙钛矿的数量非常有限，我们找到了一种新的质子化层状钙钛矿的方法。Aurivillius相（Bi_2O_2[A_<n-1>B_nO_&lt;3 n +1&gt;] ; n=3，A=（Sr，Na），B=Nb ; n=2，A=Sr，B=Ta ; n=2，不含A离子，B=W）在室温下进行酸处理。铋氧化物片被选择性地浸出，并且类钙钛矿板的结构被保留。为了补偿电荷，引入质子形成了质子化的层状钙钛矿结构，并制备了无机-有机杂化材料。以正烷氧基衍生物为中间体，可以用不同的醇对H[LaNb_2O_7]进行修饰。以类似的方式，H[LaNb_2O_7]可以被硅烷醇封端的聚二甲基硅氧烷（HO（SiMe_2O）_mH）修饰<1.8><0.2><0.8>。在紫外光照射下，H[LaNb_2O_7]的甲氧基衍生物在紫外光照射下呈蓝色。蓝色在空气中逐渐消失，但在紫外线照射下可以再次显现。着色样品的电阻率显著大于未着色样品的电阻率。

Preparation of new protonated layered perivskiteSince 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 hybridsLayered 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 compoundsH_<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 irradiationA 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.