Toward Increasing Micropore Volume between Hybrid Layered Perovskites with Silsesquioxane Interlayers
Toward Increasing Micropore Volume between Hybrid Layered Perovskites with Silsesquioxane Interlayers
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DOI：
10.1021/acs.langmuir.7b04337
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发表时间：
2018-04-10
期刊：
影响因子：
3.9
通讯作者：
Endo, Akira
中科院分区：
文献类型：
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作者：
Kataoka, Sho;Kamimura, Yoshihiro;Endo, Akira
混合有机-无机层状钙钛矿通常是无孔固体。然而，掺入具有立方笼结构的倍半硅氧烷作为夹层材料在钙钛矿层之间产生微孔。在这项研究中，我们增加了层状钙钛矿中的硅倍半氧烷与有机胺的中间层取代的一部分的体积。在所提出的方法中，约20%的倍半硅氧烷中间层可以被替换，而不改变由于倍半硅氧烷的尺寸的层距离。当小胺（例如，乙胺）时，所得混合层状钙钛矿的结晶体积增加多达44%;当大的胺（例如，苯乙胺），它们的体积减少了多达43%。通过改变胺分率，可以在一定范围内调节精馏塔体积。最后，磁矩测量表明，具有混合夹层的层状钙钛矿在低于20 K的温度下表现出铁磁有序，从而表明所获得的钙钛矿保持其作为层状钙钛矿的功能。
Hybrid organic-inorganic layered perovskites are typically nonporous solids. However, the incorporation of silsesquioxanes with a cubic cage structure as interlayer materials creates micropores between the perovskite layers. In this study, we increase in the micropore volume in layered perovskites by replacing a portion of the silsesquioxane interlayers with organic amines. In the proposed method, approximately 20% of the silsesquioxane interlayers can be replaced without changing the layer distance owing to the size of the silsesquioxane. When small amines (e.g., ethylamine) are used in this manner, the micropore volume of the obtained hybrid layered perovskites increases by as much as 44%; when large amines (e.g., phenethylamine) are used, their micropore volume decreases by as much as 43%. Through the variation of amine fraction, the micropore volume can be adjusted in the range. Finally, the magnetic moment measurements reveal that the layered perovskites with mixed interlayers exhibit ferromagnetic ordering at temperature below 20 K, thus indicating that the obtained perovskites maintain their functions as layered perovskites.