Studies on Self-Assembly of Methoxy Polyethylene Oxide Propyl Trimethoxysilane on Silicon Substrate

Abstract:

A novel hydrophilic and self-assemble functional methoxy polyethylene oxide propyl trimethoxysilane was synthesized by hydrosilylation reaction using methoxy polyethylene oxide monoallyl ether and trimethoxysilane. The self-assembled layer of methoxy polyethylene oxide propyl trimethoxysilane was prepared by immersing hydroxylate silicon substrate in silane solution. The structure, morphology and hydrophilicity of self-assembled layer were characterized by means of X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and water contact angle method. The results show that methoxy polyethylene oxide propyl trimethoxysilane can self-assemble on the surface of hydroxylate silicon substrate. At concentration of 0.80 g/100 mL and the self-assembling time of 60 minutes, the self-assembled layer of methoxy polyethylene oxide propyl trimethoxysilane of average molecular weight of 682 shows a brush-like structure with each brush column size of 10~15 nm in diameter and 5~8 nm in height. The correspondence of the columns height with the average length of the silane molecules suggests that the layer obtained is monolayer and the brush columns are constituted by extended PEO molecular chain units in the silane. The distribution of columns is uniform and the root-mean-square（RMS） roughness of self-assembled monolayer is 0.98 nm. Water contact angle of the monolayer is 7.4°. A super-hydrophilic surface is obtained.

• Periodical: Advanced Materials Research (Volumes 557-559)
• Pages: 1916-1920
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.557-559.1916
• Online since: July 2012
• Authors: Wen Shi Ma, Fang Yang, Bang Jun Deng, Hai Yan Sun, Xiao Dan Lin
• Keywords: Brush-Like Structure, Hydrophilic Silane, Root-Mean-Square Roughness, Self-Assembly, Water Contact Angle

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