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通过在玻璃基底上预先制备一层介孔TiO_2膜作为过渡层用于制备完整的Cu_3(BTC)_2(BTC:1,3,5-苯三甲酸)连续膜。场发射(FESEM)图像显示由此制得的Cu_3(BTC)_2膜在TiO_2/玻璃基底上是致密且连续,膜厚度为200 nm左右。相比之下,Cu_3(BTC)_2晶粒在空白玻璃基底上较难成核并生长,不能形成连续膜,而在无孔TiO_2/玻璃基底上,Cu_3(BTC)_2晶粒与在介孔TiO_2/玻璃基底上一样能够形成典型的八面体Cu_3(BTC)_2但不能形成连续膜。由于介孔TiO_2膜过渡层的存在,Cu_3(BTC)_2晶粒可以与基底结合紧密,经30 min超声波测试后,在介孔TiO_2/玻璃基底上的Cu_3(BTC)_2膜仍然能保持连续且完整形貌,而在空白玻璃基底上的Cu_3(BTC)_2晶粒完全脱落。推断介孔TiO_2的表面性质有利于Cu_3(BTC)_2晶粒的成核,而介孔TiO_2膜的多孔结构可以促进Cu_3(BTC)_2晶粒形成连续的薄膜:介孔TiO_2膜过渡层在Cu_3(BTC)_2膜与玻璃基底间扮演了类似桥梁的重要角色。
A complete Cu_3 (BTC) _2 (BTC: 1,3,5-benzenetricarboxylic acid) continuous film was prepared by preliminarily preparing a mesoporous TiO_2 film as a transition layer on a glass substrate. The field emission (FESEM) images show that the Cu_3 (BTC) _2 films prepared by this method are dense and continuous on the TiO_2 / glass substrate with a film thickness of about 200 nm. In contrast, the Cu_3 (BTC) _2 grains are more difficult to nucleate and grow on the blank glass substrate, and can not form a continuous film. On the non-porous TiO_2 / glass substrate, The typical octahedral Cu_3 (BTC) _2 can be formed on the TiO_2 / glass substrate but can not form a continuous film. Due to the existence of mesoporous TiO_2 film, the Cu_3 (BTC) _2 grains can be tightly bonded with the substrate. After 30 min of ultrasonic testing, the Cu_3 (BTC) _2 film on the mesoporous TiO_2 / glass substrate can still remain continuous Complete morphology, while the Cu_3 (BTC) _2 grains on the blank glass substrate completely fall off. It is inferred that the surface properties of mesoporous TiO_2 are favorable for the nucleation of Cu_3 (BTC) _2 grains, while the porous structure of mesoporous TiO_2 film can promote the continuous thin film formation of Cu_3 (BTC) _2 grains. (BTC) _2 film plays a similar role as a bridge between the glass substrate.