Abstract:
A mesoporous TiO
2 film was pre-prepared on glass substrates as a transition layer between Cu
3(BTC)
2 (BTC: benzene-1,3,5-tricarboxylate) crystal and glass to obtain an intergared Cu
3(BTC)
2 continuous film. FESEM images showed that a dense and continuous Cu
3(BTC)
2 film with film thickness~200 nm was formed on the substrate. Cu
3(BTC)
2 crystals could not nucleate and grow on raw glass. However, it could grow on the nonporous TiO
2/glass substrate as a typical octahedral shaped crystal, although it did not form a continuous film. Cu
3(BTC)
2 crystals could closely attached onto substrates with the existence of mesoporous TiO
2 transition layer. The Cu
3(BTC)
2 film on the TiO
2/glass was continuous and intact after 30 min sonication, while the film on bare glass comes off completely. The results indicate that the surface property of TiO
2 is beneficial to the nucleation and formation of Cu
3(BTC)
2 crystals, and the mesoporous structure of TiO
2 film can accelerate Cu
3(BTC)
2 crystal growth to form a continuous film. The mesoporous TiO
2 transition layer plays a key role in connecting Cu
3(BTC)
2 film with glass substrates.
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