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采用溶胶-凝胶技术、蒸发诱导自组装法,通过酸/酸二步法控制实验条件,实验中采用表面活性剂十六烷基三甲基溴化氨(CTAB)为模板剂,正硅酸乙酯为硅源、罗丹明B、以及二次去离子水,盐酸为催化剂等原料制备前驱体溶胶。通过简单提拉迅速蒸发溶剂制备介孔薄膜,对介孔薄膜进行了X射线衍射、透射电子显微镜表征,观察了薄膜样品的吸收光谱和荧光光谱。含罗丹明B膜的吸收光谱表明主峰是RhB单体的吸收和微弱吸收的次峰是RhB形成的二聚体的吸收。而在荧光光谱中只有一个发射谱带,这是RhB单体的最低激发能级到基态能级的跃迁.含罗丹明B的纳米复合介孔薄膜中,随着RhB浓度的增大,荧光峰位发生红移,这可以说明激发态分子的偶极矩减小。
The sol-gel technique and evaporation-induced self-assembly method were used to control the experimental conditions by the acid / acid two-step method. The surfactant Cetyltrimethylammonium Bromide (CTAB) Ethyl ester as a silicon source, rhodamine B, and twice deionized water, hydrochloric acid as a catalyst and other raw materials to prepare a precursor sol. The mesoporous thin films were prepared by simply pulling and solvent evaporation. The mesoporous films were characterized by X-ray diffraction and transmission electron microscopy. The absorption and fluorescence spectra of the films were observed. The absorption spectrum of Rhodamine B-containing membranes shows that the main peak is the absorption of the RhB monomer and the sub-absorption of the weak absorption is the absorption of the dimer formed by RhB. While there is only one emission band in the fluorescence spectrum, which is the transition from the lowest excitation level of RhB monomer to the ground state level.With the increase of RhB concentration in the nanocomposite mesoporous membrane containing Rhodamine B, the fluorescence peak The red shifts of the positions indicate the decrease of the dipole moments of the excited state molecules.