New Method in Surface Treatment of Nanopipette for Interface between Two Immiscible Electrolyte Solutions (ITIES) Experiment
New Method in Surface Treatment of Nanopipette for Interface between Two Immiscible Electrolyte Solutions (ITIES) Experiment
复制标题
两种不混溶电解质溶液界面纳米移液器表面处理新方法（ITIES）实验
DOI：
10.1149/1945-7111/ac5619
复制
发表时间：
2022
影响因子：
3.9
通讯作者：
Shen, Mei
中科院分区：
文献类型：
--
作者：
Anupriya, Edappalil Satheesan;Shen, Mei
两个不相容的电解质溶液之间的界面是化学传感和研究电子/离子转移反应的强大平台，通常形成于两个不相容的溶液(如油相和水相)的界面之间。微/纳米界面通常形成在硼硅酸盐/石英吸管的顶端，其内表面可以通过一种称为硅烷化的方法使其疏水以填充有机溶剂。纳米/微米尺寸的电极通常通过蒸汽硅烷化方法进行硅烷化，在这种方法中，气相中的硅烷化试剂暴露在纳米管中。微米级的吸管也被直接填充液体硅烷化试剂进行硅烷化，这是一种液体硅烷化方法，但这种方法还没有在纳米级应用。液体硅烷化方法允许选择性地对双通道移液管平台中的单个通道进行硅烷化。在这里，我们发展了纳米级的液体硅烷化方法，并证明了可以实现水/二氯乙烷界面上四丁基铵离子转移的稳定循环伏安。我们还提出了纳米级液体硅烷化的挑战和克服这些挑战的策略。本文提出的液体硅烷化方法为今后发展一通道为纳米ITIES的双通道多功能探头奠定了基础。
Interface between two immiscible electrolyte solutions (ITIES) is a powerful platform for chemical sensing and studying electron/ion transfer reactions and is typically formed between the interface of two immiscible solutions such as an oil phase and an aqueous phase. Micro/nano ITIES interface are generally formed at the tip of a borosilicate/quartz pipette, inner surface of which can be rendered hydrophobic to be filled with an organic solvent by a method called silanization. Nano/micrometer-sized electrodes are typically silanized by vapor silanization methods in which silanizing agent in vapor phase is exposed to nanopipettes. Micrometer-sized pipettes have been also silanized by directly filling liquid silanization agent, one type of liquid silanization methods, but this method has not been used at the nanoscale. Liquid silanization method allows to selectively silanize a single channel in a dual-channel pipette platform. Here, we developed the liquid silanization method for nanoscale ITIES and demonstrated that a stable cyclic voltammogram for tetrabutylammonium ion transfer across water/dichloroethane interface can be accomplished. We also presented challenges for liquid silanization at the nanoscale and strategies to overcome them. The liquid silanization methods presented here lay the foundation for future development of dual channel multi-functional probe where one channel is nanoITIES.