Immobilization of alkane molecules on oxide surface with silicone alkoxide

Narita, Ayumi; Baba, Yuji  ; Sekiguchi, Tetsuhiro  ; Shimoyama, Iwao   ; Hirao, Norie; Yaita, Tsuyoshi

Organic thin films have advantages over currently used Si-devises, and they can have new functions that Si-devices don't have. However, there are several problems to be solved such as chemical states of organic-inorganic interfaces and molecular orientations. In this study, we investigated chemical states of the interface between mercapto-propyl-trimetoxy-silane (MPTS) and aluminum oxide using X-ray photoelectron spectroscopy (XPS) and near edge X-ray absorption fine structure (NEXAFS). For the XP spectra, it was elucidated that MPTS molecules and aluminum oxide surface made the chemical bond through silicon alkoxide. Moreover, the NEXAFS spectra at the silicon K-edge show a polarization dependence. From these results, we concluded that MPTS molecules locate perpendicular direction to the aluminum oxide surface.