期刊
ACS NANO
卷 10, 期 4, 页码 4565-4569出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.6b00645
关键词
ionic liquid; electric double layer; X-ray reflectivity; electrolyte gating; SrTiO3
类别
资金
- Department of Defense (DoD) through the National Defense Science and Engineering Graduate Fellowship (NDSEG) Program
- Stanford Graduate Fellowship (SGF)
- National Science Foundation [ECCS-1542152]
- Department of Energy, Laboratory Directed Research and Development [DE-AC02-76F00515]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-76SF00515]
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.
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