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Report No.

Immobilization of alkyl chain molecules with phosphonic acid on oxide surface

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

Immobilization of organic molecules on oxide surface has been investigated using phosphonic acid as an anchor. The molecule investigated was decyl-phosphonic acid (DPA). The DPA film was formed by immersing the sapphire substrate in DPA ethanol solution. The results for X-ray photoelectron spectra (XPS) showed that the alkyl chain of the DPA molecules is located at the upper side, while the phosphonic acid is the lower side on the surface. The XPS and near-edge X-ray absorption fine structure (NEXAFS) results indicated that the DPA film became homogeneous monolayer by heating at 250$$^{circ}$$C. It is concluded that the phosphonic acid is an excellent anchor that immobilizes the organic molecules on an oxide surface.



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