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Electrical behaviour of ionic liquid confined in nanochannels
Microfluidics and Nanofluidics ( IF 2.8 ) Pub Date : 2021-08-21 , DOI: 10.1007/s10404-021-02481-4
Sangeeta Negi 1
Affiliation  

The confinement of ionic liquid inside the nanochannels and its transportation through it under applied potential is being reported. The nanochannels in SiON/Si structure have been created by swift heavy ion bombardment of Au26+ ionś beam at a fluence of 108 ions/cm2 having 350 MeV energy. After chemical etching, these channels (~ 50 to 80 nm diameter) have been filled by ionic liquid (IL) to see their behaviour under applied electrical bias. Due to the high self-diffusion coefficient and low viscosity (compared to other ionic liquids), EMImTFSI has been chosen for the said purpose. The effect of temperature (35–50 °C) and concentration of ionic liquid (undiluted and 50%, 60% and 75% diluted) on IL-SiON/Si structures has been studied. Dissociation of the ionic liquid by the applied voltage and charge extraction/injection through ion channels results in diode-like current–voltage behaviour. Ion current rectification presented in this paper depends on ionś concentration and the temperature of the ionic liquid. It also depends on the applied voltage at a given temperature. It has been found that the ion current rectification ratio decreases with dilution of the ionic liquid. For the system with 75% diluted IL, SiON/Si system has the same behaviour as the one without IL. Since the temperature affects the mobility of ions hence, it also affects the current–voltage behaviour of the system.



中文翻译:

限制在纳米通道中的离子液体的电学行为

正在报道纳米通道内离子液体的限制及其在施加电位下通过它的传输。SiON/Si 结构中的纳米通道是由 Au 26+离子束以 10 8离子/cm 2的通量快速重离子轰击产生的具有 350 MeV 的能量。化学蚀刻后,这些通道(直径约 50 至 80 nm)已被离子液体 (IL) 填充,以查看它们在施加的电偏压下的行为。由于高自扩散系数和低粘度(与其他离子液体相比),EMImTFSI 已被选择用于上述目的。已经研究了温度(35-50°C)和离子液体浓度(未稀释和 50%、60% 和 75% 稀释)对 IL-SiON/Si 结构的影响。通过施加电压和电荷提取/注入通过离子通道解离离子液体导致类似二极管的电流-电压行为。本文中提出的离子电流整流取决于离子浓度和离子液体的温度。它还取决于在给定温度下施加的电压。已经发现离子电流整流比随着离子液体的稀释而降低。对于稀释 75% IL 的系统,SiON/Si 系统与没有 IL 的系统具有相同的行为。由于温度会影响离子的迁移率,因此它也会影响系统的电流-电压行为。

更新日期:2021-08-23
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