Ion Current Rectification and Long-Range Interference in Conical Silicon Micropores.

ABSTRACT: Fluidic devices exhibiting ion current rectification (ICR), or ionic diodes, are of broad interest for applications including desalination, energy harvesting, and sensing, among others. For such applications a large conductance is desirable, which can be achieved by simultaneously using thin membranes and wide pores. In this paper we demonstrate ICR in micrometer sized conical channels in a thin silicon membrane with pore diameters comparable to the membrane thickness but both much larger than the electrolyte screening length. We show that for these pores the entrance resistance is key not only to Ohmic conductance around 0 V but also for understanding ICR, both of which we measure experimentally and capture within a single analytic theoretical framework. The only fit parameter in this the

SUBMITTER: Aarts M 

PROVIDER: S-EPMC9782324 | biostudies-literature | 2022 Dec

REPOSITORIES: biostudies-literature