Probing a reversible cationic switch on a mixed self-assembled monolayer using Scanning Electrochemical Microscopy
Probing a reversible cationic switch on a mixed self-assembled monolayer using Scanning Electrochemical Microscopy
复制标题
使用扫描电化学显微镜探测混合自组装单层上的可逆阳离子开关
DOI：
10.1021/acs.langmuir.9b01429
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发表时间：
2019
期刊：
影响因子：
3.9
通讯作者：
Huibo Shao
中科院分区：
文献类型：
--
作者：
Ximing Huang;Jingchao Chen;Chunxia Yan;Huibo Shao
Probing a switch on biomimic membrane surfaces would offer some references to the research on permeability of cytomembranes. In this work, a mixed 11-mercaptoundecanoic acid/1-undecanethiol self-assembled monolayer (MUA/UT SAM) was constructed as a model of a biomembrane. In this mixed SAM, the MUA molecules work as functional parts for the switch and the UT molecules work as diluents. The surface coverage, wetting property, and pKaof this mixed SAM all have been well-inspected. The mixed SAM exhibits excellent switchable properties for cations, which is well-monitored by scanning electrochemical microscopy. When the pH of a solution is higher than the pKa, protons would stimulate a shift of dissociation equilibrium of terminal carboxyl groups. The dissociated carboxylate ions would lead to a switch on the state of the SAM. Otherwise, the SAM shows an off state when the pH is lower than the pKa. In addition, the repeatability, applicability, and the mechanism of the switch all have been well-evaluated.
