Origin Of Nonequilibrium 1/Fnoise In Solid-State Nanopores
NANOSCALE(2020)
摘要
Nanopore devices are applied in many fields such as molecular sensing and DNA sequencing, and the detection precision is primarily determined by 1/fnoise. The mechanism of 1/fnoise in nanopores is still not clearly understood, especially the nonequilibrium 1/fnoise in rectifying nanopores. Hereby, we propose that 1/fnoise in solid-state nanopores originates from the electrolyte ion trapping-detrapping process occurring on the inner surface of the nanopores, which can nonlinearly affect the ion number inside the rectifying nanopores due to the specific ion enrichment/depletion effect. Our model can not only quantitatively explain the nonlinear dependence of 1/fnoise on the applied voltage,i.e., the nonequilibrium 1/fnoise, for current rectifying nanopores, but also provide a unified explanation on the influence of the electrolyte concentration, pH value, and geometry of the nanopores. From our model, we observe a new flattening phenomenon of 1/fnoise in conical nanopores, and this is further confirmed by our experimental results. Our research can be helpful in understanding and reducing 1/fnoise in other nanopore devices, especially where the enrichment or depletion of ions exists.
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关键词
noise,solid-state
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