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Ionic Conductivity in Ionic Liquid Nano Thin Films
ACS Nano ( IF 15.8 ) Pub Date : 2018-09-10 00:00:00 , DOI: 10.1021/acsnano.8b06386 Shingo Maruyama 1 , Ida Bagus Hendra Prastiawan 2 , Kaho Toyabe 1 , Yuji Higuchi 2 , Tomoyuki Koganezawa 3 , Momoji Kubo 2 , Yuji Matsumoto 1
ACS Nano ( IF 15.8 ) Pub Date : 2018-09-10 00:00:00 , DOI: 10.1021/acsnano.8b06386 Shingo Maruyama 1 , Ida Bagus Hendra Prastiawan 2 , Kaho Toyabe 1 , Yuji Higuchi 2 , Tomoyuki Koganezawa 3 , Momoji Kubo 2 , Yuji Matsumoto 1
Affiliation
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Thin film approaches are powerful methods for gaining a nanoscale understanding of interfacial ionic liquids (ILs) in the vicinity of solids. These approaches are used to directly elucidate the interfacial contributions to the physical properties of ILs as nanoscale thin films have significant proportions of the surface or interface region with respect to their total volume. Here, we report the growth of a uniform [emim][TFSA] thin film ionic liquid on a chemically modified, well-wettable sapphire, thereby allowing the in situ measurement of its ionic conductivity on the nanoscale. We observed the thickness-dependent behavior of the ionic conductivity, which gradually decreased especially when the thickness was less than 10 nm, and found it to be quantitatively analyzed well by using an empirical two-layer model. The molecular dynamics (MD) simulations show that the thickness-dependent ionic conductivity originates from the solid-like structuring of the IL near the substrate, reproducing a thickness-dependent ionic conductivity. The MD simulation results suggest that the thickness of the low conductivity region determined in the two-layer model should roughly correspond to the thickness of the solid-like structuring of the IL near the substrate.
中文翻译：
离子液体纳米薄膜中的离子电导率
薄膜方法是获得纳米级了解固体附近界面离子液体（IL）的有力方法。这些方法用于直接阐明对IL物理特性的界面贡献，因为纳米级薄膜相对于其总体积而言，其表面或界面区域的比例很大。在这里，我们报告了在化学改性，可湿润的蓝宝石上均匀[emim] [TFSA]薄膜离子液体的生长，从而可以原位在纳米级上测量其离子电导率。我们观察到离子电导率随厚度变化的行为，尤其是当厚度小于10 nm时，离子电导率逐渐下降，并发现使用经验两层模型可以很好地对其进行定量分析。分子动力学（MD）模拟表明，厚度相关的离子电导率源自基底附近IL的固体结构，从而再现了厚度相关的离子电导率。MD仿真结果表明，在两层模型中确定的低电导率区域的厚度应大致对应于基板附近的IL的固体结构的厚度。
更新日期：2018-09-10
中文翻译：
离子液体纳米薄膜中的离子电导率
薄膜方法是获得纳米级了解固体附近界面离子液体（IL）的有力方法。这些方法用于直接阐明对IL物理特性的界面贡献，因为纳米级薄膜相对于其总体积而言，其表面或界面区域的比例很大。在这里，我们报告了在化学改性，可湿润的蓝宝石上均匀[emim] [TFSA]薄膜离子液体的生长，从而可以原位在纳米级上测量其离子电导率。我们观察到离子电导率随厚度变化的行为，尤其是当厚度小于10 nm时，离子电导率逐渐下降，并发现使用经验两层模型可以很好地对其进行定量分析。分子动力学（MD）模拟表明，厚度相关的离子电导率源自基底附近IL的固体结构，从而再现了厚度相关的离子电导率。MD仿真结果表明，在两层模型中确定的低电导率区域的厚度应大致对应于基板附近的IL的固体结构的厚度。
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