Optical Humidity Sensing Using Transparent Hybrid Film Composed of Cationic Magnesium Porphyrin and Clay Mineral
Optical Humidity Sensing Using Transparent Hybrid Film Composed of Cationic Magnesium Porphyrin and Clay Mineral
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DOI：
10.1021/acs.langmuir.7b04006
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发表时间：
2018-03-27
期刊：
影响因子：
3.9
通讯作者：
Takagi, Shinsuke
中科院分区：
文献类型：
--
作者：
Fujimura, Takuya;Shimada, Tetsuya;Takagi, Shinsuke
制备了一种由阳离子镁卟啉和粘土矿物组成的透明杂化薄膜，并研究了其变色行为与相对湿度的关系。通过将卟啉镁插层到粘土薄膜中得到杂化薄膜，将卟啉镁插层到粘土矿物的层间空间中，没有团聚。与镁卟啉水溶液相比，杂化膜的吸收光谱发生了红移，这是因为它的共轭体系随着介孔取代的吡啶基团和卟啉环的共面化而扩展。随着RH的增加，杂化膜的吸收峰逐渐向更短的波长移动，杂化膜的颜色也发生了变化。X-射线衍射仪测量表明，随着相对湿度的增加，粘土的基面空间扩大，说明粘土的层间距因吸附水分而扩大，光谱的漂移是由于卟啉环与介孔取代吡啶基团之间共面化度的变化引起的。
A transparent hybrid film composed of cationic magnesium porphyrin and clay mineral was developed, and its chromic behavior depending on relative humidity (RH) was investigated. The hybrid film was obtained via intercalation of magnesium porphyrin into clay film; magnesium porphyrin was intercalated into the interlayer spaces of the clay mineral without aggregation. The absorption spectra of the hybrid film showed red shifts compared to the aqueous solution of magnesium porphyrin because of the it-conjugated system extension with coplanarization of the meso-substituted pyridinium group and porphyrin ring. The absorption maximum of the hybrid film was gradually shifted to a shorter wavelength, and the color of the hybrid film was changed with increasing RH. The X-ray diffraction measurement suggested that the basal space of clay was expanded with increasing RH, indicating that the interlayer space of clay was expanded by water adsorption, and the spectral shift was induced by the change in coplanarization degree between the porphyrin ring and meso-substituted pyridinium groups.