Voltage-Controlled Interfacial Layering in an Ionic Liquid on SrTiO3

被引：29

作者：

Petach, Trevor A. ^{[1
]}

Mehta, Apurva ^{[2
]}

Marks, Ronald ^{[2
]}

Johnson, Bart ^{[2
]}

Toney, Michael F. ^{[2
]}

Goldhaber-Gordon, David ^{[1
]}

机构：

[1] Stanford Univ, Dept Phys, Palo Alto, CA 94305 USA

[2] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

来源：

ACS NANO | 2016年 / 10卷 / 04期

基金：

美国国家科学基金会;

关键词：

ionic liquid; electric double layer; X-ray reflectivity; electrolyte gating; SrTiO3; ELECTRODEPOSITION; AU(111); SURFACE;

D O I：

10.1021/acsnano.6b00645

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

One prominent structural feature of ionic liquids near surfaces is formation of alternating layers of anions and cations. However, how this layering responds to an applied potential is poorly understood. We focus on the structure of 1-b utyl-1-methylpyrrolidinium tris (pentafluoroethyl) trifluoro phosphate (BMPY-FAP) near the surface of a strontium titanate (SrTiO3) electric double-layer transistor. Using X-ray reflectivity, we show that at positive bias the individual layers in the ionic liquid double layer thicken and the layering persists further away from the interface. We model the reflectivity using a modified distorted crystal model with alternating cation and anion layers, which allows us to extract the charge density and the potential near the surface. We find that the charge density is strongly oscillatory with and without applied potential and that with an applied gate bias of 4.5 V the first two layers become significantly more cation rich than at zero bias, accumulating about 2.5 X 10(13) cm(-2) excess charge density.

引用

收藏

页码：4565 / 4569

页数：5

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