Exploring 1/f noise behavior of ion current in a single channel of conically shaped pipette filled with electrolyte solution

摘要

To address a fundamental question on the origin of 1/f noise of ion current observed in various artificial nanopore systems is considered to be a big challenge. Several experimental parameters such as pH, electrolyte concentration and bias voltage have been examined in order to insight into its mechanism [1-2]. These parameters have shown large effect on noise level. Among noise level, ion current, frequency and number of charged carrier, they follow a Hooge rule for most nanopores. So far, two possible mechanisms of 1/f noise have been proposed. It is supposed to be either related to different surface charge states or fluctuation of ion current depending on the different types of nanopores. To have a better understanding about origin and characters of 1/f noise, a new nanopore system is necessary to be tested.