Controllable Architecture of Mesoporous Double-Nanoshell SiO 2 /TiO 2 Hollow Tube Based on Layer by Layer Method

[摘要] Double-shell tubular on-dimensional structure can be fabricated through a layer by layer method, in which the core template was removed to create the tubular shape. In this paper, we report, for the first time, the double nanoshell SiO 2 /TiO 2 hollow tubes prepared through a layer-by-layer deposition method involving the sol-gel process for the SiO 2 and TiO 2 generation. During TEOS and TEOT hydrolysis/condensation for the SiO 2 and TiO 2 shell layer formation, cetyltrimethylammonium bromide (CTAB) is adopted both as the structure-directing template and as the mesopore-channel template distributing around the shell. The obtained double-nanoshell hollow tubes illustrate a large surface area and high pore volume. Also, mesoporous double-nanoshell SiO 2 /TiO 2 hollow tubes have the inner and outer shell thickness of about 80 nm and 120 nm, respectively. Plus, the shell thickness of SiO 2 and TiO 2 is controllable depending on the used concentration of TEOS and TEOT during their sol-gel process. Therefore, the technique for the preparation of SiO 2 /TiO 2 mesoporous double-nanoshell hollow tubes could provide new insights into the construction of mesoporous double-shell and hollow structure for other multicomponent and hierarchical hybrid systems.

[学科分类] 泌尿医学