Optical Humidity Sensing Using Transparent Hybrid Film Composed of Cationic Magnesium Porphyrin and Clay Mineral,Langmuir

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Optical Humidity Sensing Using Transparent Hybrid Film Composed of Cationic Magnesium Porphyrin and Clay Mineral
Langmuir ( IF 3.7 ) Pub Date : 2018-02-27 00:00:00 , DOI: 10.1021/acs.langmuir.7b04006
Takuya Fujimura ₁ , Tetsuya Shimada , Ryo Sasai ₁ , Shinsuke Takagi

Affiliation

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 π-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.

中文翻译：

使用由阳离子镁卟啉和粘土矿物组成的透明混合膜进行光湿感测

研发了一种由阳离子镁卟啉和粘土矿物组成的透明杂化膜，并研究了其相对于相对湿度（RH）的变色行为。杂化膜是通过将卟啉镁插入粘土膜中而获得的。镁卟啉被插入到粘土矿物的层间空间中而没有聚集。与π-卟啉镁水溶液相比，杂化膜的吸收光谱显示出红移，这是因为π-共轭体系的扩展以及介观取代的吡啶鎓基团和卟啉环的共平面化。杂化膜的最大吸收逐渐移至较短的波长，并且杂化膜的颜色随RH的增加而改变。

更新日期：2018-02-27

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