Rational construction of self-assembly azobenzene derivative monolayers with photoswitchable surface properties

文献类型： 外文期刊

第一作者： Zhang, Yu

作者： Zhang, Yu;Yue, Qin;Deng, Yonghui;Gao, Peng;Trefonas, Peter;Deng, Yonghui

作者机构：

关键词： Self-assembly; Monolayer; Azobenzene; Photoswitch; Surface treatment

期刊名称：CHINESE CHEMICAL LETTERS （ 影响因子：6.779； 五年影响因子：4.558 ）

ISSN： 1001-8417

年卷期： 2018 年 29 卷 11 期

页码：

收录情况： SCI

摘要： Photo-responsive azobenzene (ABZ) derivatives with different end groups (R) as photoswitchable molecules were employed to construct self-assembled monolayers (SAMs) on silicon substrate by using 3-glycidoxypropyltrimethoxysilane (GPTS) as the bridging molecules. The assembly process was optimized by changing various parameters, including the type and concentration of ABZ derivatives, reaction time, etc. The obtained SAMs were fully characterized and evaluated using UV spectroscopy, atomic force microscope (AFM), elllipsometer, static contact angle and X-ray photoelectron spectroscopy (XPS). It is found that the end group property of azobenzene derivatives is critical to the obtained SAMs' photoresponsive properties. Compared with hydrophobic compounds (4-(4'-aminophenylazo) benzoic acid, ABZ-CF3), the hydrophilic compounds (4-(4'-aminophenylazo) benzoic acid, ABZ-COOH) show excellent reversible photoswitching performance with a large contact angle change of 35 degrees under optimized process, and the SAMs are removable by thermal treatment at 240 degrees C in air for only 5 min. (C) 2018 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.

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