Morphology of mesoporous silica grown on organic surfaces: effects of surface functional groups and microstructures

摘要

Through organized surfactant templating, mesoporous silica (MPS) was prepared on two different types of substrates with a hydrophilic or hydrophobic surface. In this study, a Si substrate covered with photochemically-grown surface oxide was served as the hydrophilic surface. The hydrophobic surfaces were prepared by forming an organosilane self-assembled monolayer (SAM) on Si substrates through chemical vapor deposition. Octadecyl-trimetoxysilane or (heptadecafluoro- 1,1 2,2-tetrahydro-decyl) trimethoxysilane was used as a precursor. The morphologies of the deposited MPS on these surfaces were found to be quite different. The MPS formed on the hydrophilic Si substrate consisted of small disk-like features of 2~5 um in diameter, while those on the hydrophobic SAM surfaces were continuous thin films.