Ion Transport in Mesoporous Silica SBA-16 Thin Films with 3D Cubic Structures
Ion Transport in Mesoporous Silica SBA-16 Thin Films with 3D Cubic Structures
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DOI：
10.1021/la204477h
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发表时间：
2012-02-21
期刊：
影响因子：
3.9
通讯作者：
Endo, Akira
中科院分区：
文献类型：
--
作者：
Daiguji, Hirofumi;Hwang, Junho;Endo, Akira
采用浸渍提拉法在硅衬底上制备了具有高度有序三维立方结构的介孔二氧化硅SBA-16薄膜。在这些薄膜中填充KCl水溶液后，通过施加直流电场测量了流过介孔的离子电流。在低离子浓度下，测得的I-V曲线是非线性的，电流随电压呈指数增长。随着离子浓度的增加，I-V曲线趋于线性。I-V曲线的非线性行为可以合理地归因于纳米孔中产生的电势垒。
Mesoporous silica SBA-16 thin films with highly ordered 3D cubic structures were synthesized on a Si substrate via the dip-coating method. After these films were filled with KCl aqueous solutions, the ionic current passing through the mesopores was measured by applying dc electric fields. At low ion concentrations, the measured I-V curves were nonlinear and the current increased exponentially with respect to voltage. As the ion concentration increased, the I-V curve approached linear behavior. The nonlinear behavior of I-V curves can be reasonably attributed to the electric potential barrier created in nanopores.