| 초록 |
Highly ordered inorganic mesoporous thin films have been regarded as quite attractive in potential applications such as separation, catalysis, sensors, and electronic devices. Recently, we and other groups have reported periodic mesoporous organosilicas (PMOs) unique in containing organic functional groups inside the channel wall. The organic modification of the silica framework have several advantages of diverse variation of mechanical, optical and electrical properties. In our previous work, we prepared mesoporous ethanesilica thin films using PEO-PLGA-PEO block copolymers as structure directing agents and BTESE (1,2-bis(triethoxysilyl) ethane (BTESE); bridged organosilicate) as inorganic precursors by spin-coating process. Key experimental parameters in the synthesis of mesoporous organosilica film are found to be the block template/organosilica precursor ratio in the casting solutions and aging time before calcinations to control optimal extent of silica hyrolysis and condensation. Here, mesoporous ethane-bridged silica film was prepared in a one-pot synthesis of sol-gel condensation. We observed that mesoscopic order develops through silica condensation and rearrangement of block template/organosilica composite during calcinations. In particular, the are of hexagonal mesophase can be extended by adjusting the rate of solvent evaporation and rearrangement of silica/polymer composites. |
