IONIC CURRENT RECTIFICATION THROUGH pH-REGULATEDNANOPORES

[摘要] This research article reports the pH dependent ionic current rectification (charge transport)in track-etched cylindrical nanopores of polycarbonate (PC). For preparation of cylindricalnanopores, irradiated PC foil was chemically etched with 6M NaOH solution on both sidesin electrochemical cell. The behavior of ionic transportation was recorded with steppingvoltage at different ionic concentrations and the pH of electrolytic solution undersymmetric and asymmetric condition in an electrolytic cell. The results revealed that bulkconcentration and pH of electrolytic solution significantly influence the ionic conductance.Under highly asymmetric pH condition, the nanopores behaves like solid state p-n junctiondiode and rectification through the nanopores was observed. The functional carboxylicgroup (-COOH) and movable ions of electrolytic solution inside the nanopores wall arefound responsible for ionic current transportation (ICT) but for ionic current rectification(ICR), asymmetric combination of pH of potassium halides electrolyte in electrolytic cellwas responsible.

[学科分类] 生物技术

[关键词] Nanopores;Polycarbonate;ICR;pH-regulator