Electrostatic Ion Enrichment in an Ultrathin-Layer Cell with a Critical Dimension between 5 and 20 nm.
Electrostatic Ion Enrichment in an Ultrathin-Layer Cell with a Critical Dimension between 5 and 20 nm.
复制标题
临界尺寸在 5 至 20 nm 之间的超薄层电池中的静电离子富集。
DOI：
10.1021/acs.analchem.6b02916
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发表时间：
2017
影响因子：
7.4
通讯作者：
Zhang,Bo
中科院分区：
文献类型：
--
作者：
Lu,Jin;Zhang,Bo
静电相互作用在许多分析应用中起着至关重要的作用，包括利用纳米孔进行分子传感和输运研究以及带电物种的分离。在这里，我们报告了在5-20 nm薄的电化学池中的静电离子富集量的伏安定量。采用一种简单的光刻微/纳米加工工艺来制备临界尺寸(即单元厚度)为5 nm的超薄层单元(UTLC)。UTLC的伏安响应主要由细胞壁上的电荷与氧化还原物种之间的静电相互作用所主导。我们发现，超小的细胞尺寸产生了100-300倍的阳离子氧化还原物种的浓缩。此外，还发现了一种有趣的表面吸附效应。
Electrostatic interactions play an essential role in many analytical applications including molecular sensing and transport studies using nanopores and separation of charged species. Here, we report the voltammetric quantification of electrostatic ion enrichment in a 5–20 nm thin electrochemical cell. A simple lithographic micro/nanofabrication process was used to create ultrathin-layer cells (UTLCs) with a critical dimension (i.e., cell thickness) as small as 5 nm. The voltammetric response of a UTLC was found to be largely dominated by the electrostatic interaction between charges on the cell walls and the redox species. We show that the ultrasmall cell dimension yielded a 100–300-fold enrichment for cationic redox species. An interesting surface adsorption effect was also demonstrated.