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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 0.5-2nm in diameter,the slope angles are around-2.5° to-10°.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.
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 ° to-10 ° .Moreover, the pore orifice can be enlarged slightly by additional repeating pulses. The conic pore lumen became close to a cylindrical channel, resulting in a symmetry IV transport under positive and negative biases. A qualitative understanding of these effects will help us to prepare useful solid-nanopores as demanded.