To prepare the transparent solid film of layered double hydroxide, the filtration-film transfer (FFT) method using LDH nanosheet colloidal suspension was investigated. It was found that the homogeneous LDH solid film with enough transparency in the visible light range could be prepared by the FFT method. Moreover, anionic pyrene (Pyr−) molecules could be incorporated into the transparent LDH solid film by immersing in anionic pyrene solution. From both absorption and emission spectra of the transparent Pyr−/LDH solid film, Pyr− incorporated in the LDH solid film formed aggregates and mainly showed the strong excimer emission. Additionally, the luminous response of the transparent Pyr−/LDH solid film was investigated in ethanol-toluene mixed solution with various toluene contents. As results, the ratio of luminescence intensities from static excimer and monomer of incorporated Pyr− molecules depended on the toluene content, and excimer emission decreased with an increase in the toluene content. This luminous response can be caused by an increase of the monomeric Pyr− species, because Pyr− aggregates are broken by adsorption of toluene molecules into the LDH interlayer space. The obtained transparent hybrid film may be useful as a detectable material of toluene in solvent by luminous change.

中文翻译：

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阴离子芘衍生物层状双氢氧化物透明薄膜的制备及其发光甲苯检测能力

为了制备层状双氢氧化物的透明固体膜，研究了使用LDH纳米片胶体悬浮液的过滤膜转移（FFT）方法。发现通过FFT方法可以制备在可见光范围内具有足够透明度的均匀LDH固体薄膜。此外，通过浸入阴离子芘溶液，阴离子芘（Pyr-）分子可以结合到透明的LDH固体薄膜中。从透明的 Pyr-/LDH 固体膜的吸收和发射光谱来看，掺入 LDH 固体膜中的 Pyr-形成聚集体，主要表现出强烈的准分子发射。此外，还研究了透明 Pyr-/LDH 固体薄膜在不同甲苯含量的乙醇-甲苯混合溶液中的发光响应。结果，静态准分子的发光强度与掺入 Pyr− 分子的单体的发光强度比取决于甲苯含量，准分子发射随着甲苯含量的增加而降低。这种发光响应可能是由单体 Pyr− 物种的增加引起的，因为 Pyr− 聚集体通过甲苯分子吸附到 LDH 层间空间而被破坏。获得的透明混合膜可用作溶剂中甲苯通过发光变化的可检测材料。