MOLECULAR AGGREGATION STATE OF N-OCTADECYLTRICHLOROSILANE MONOLAYER PREPARED AT AN AIR WATER INTERFACE/

Molecular arrangement of polymerized n-octadecyltrichlorosilane (OTS, CH3(CH2)(17)SiCL3) monolayer transferred onto hydrophilic substrate by an upward drawing method was investigated with a transmission electro n microscope (TEM) and an atomic force microscope(AFM). The electron d iffraction (ED) pattern of the OTS monolayer revealed that the OTS mol ecules were regularly arranged in a hexagonal array with a (10) spacin g of ca. 0.42 nm. The high-resolution AFM image of the OTS monolayer i n a scan area of 10 x 10 nm(2) exhibited the individual methyl group o f which packing was a hexagonal array in a similar molecular arrangeme nt concluded on the basis of the ED study. Also, the point defect in t he crystalline OTS monolayer was successfully observed for the first t ime.