| CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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Rectification of Ion Current Determined by the Nanopore Geometry: Experiments and Modelling |
| Da-Ming Zhou1†, Yun-Sheng Deng1†, Cui-Feng Ying1,2, Yue-Chuan Zhang1,3, Yan-Xiao Feng1, Qi-Meng Huang1, Li-Yuan Liang1, De-Qiang Wang1** |
1Chongqing Key Laboratory of Multi-scale Manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chongqing 400714
2Key Laboratory of Weak-Light Nonlinear Photonics (Ministry of Education), School of Physics, Nankai University, Tianjin 300071
3University of Electronic Science and Technology of China, Chengdu 611731
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| Cite this article: |
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Da-Ming Zhou, Yun-Sheng Deng, Cui-Feng Ying et al 2016 Chin. Phys. Lett. 33 108501 |
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Abstract We provide a way to precisely control the geometry of a SiN$_x$ nanopore by adjusting the applied electric pulse. The pore is generated by applying the current pulse across a SiN$_x$ membrane, which is immersed in potassium chloride solution. We can generate single conical and cylindrical pores with different electric pulses. A theoretical model based on the Poisson and Nernst–Planck equations is employed to simulate the ion transport properties in the channel. In turn, we can analyze pore geometries by fitting the experimental current-voltage ($I$–$V$) curves. For the conical pores with a pore size of 0.5–2 nm in diameter, the slope angles are around $-2.5^{\circ}$ to $-10^{\circ}$. Moreover, the pore orifice can be enlarged slightly by additional repeating pulses. The conic pore lumen becomes close to a cylindrical channel, resulting in a symmetry $I$–$V$ transport under positive and negative biases. A qualitative understanding of these effects will help us to prepare useful solid-nanopores as demanded.
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Received: 13 June 2016
Published: 27 October 2016
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| PACS: |
85.35.-p
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(Nanoelectronic devices)
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66.10.-x
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(Diffusion and ionic conduction in liquids)
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81.16.-c
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(Methods of micro- and nanofabrication and processing)
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02.60.-x
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(Numerical approximation and analysis)
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| Fund: Supported by the National Natural Science Foundation of China under Grant Nos 61471336, 51503207 and 61504146, and the Joint-Scholar of West Light Foundation of Chinese Academy of Sciences. |
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