Open AccessPink Noise of Ionic Conductance through Single Artificial Nanopore Revisted
Author(s) -
Christophe Tasserit,
Alexandros Koutsioubas,
D. Lairez,
G. Zalczer,
Marie-Claude Clochard
Publication year - 2010
Publication title -
hal (le centre pour la communication scientifique directe)
Language(s) - English
DOI - 10.1103/physrevlettt.105.260602
Subject(s) - nanopore , conductance , noise (video) , ionic bonding , materials science , physics , nanotechnology , computer science , artificial intelligence , condensed matter physics , ion , image (mathematics) , quantum mechanics
International audienceWe report voltage-clamp measurements through single conical nanopore obtained by chemical etching of a single ion track in polyimide film. Special attention is paid to the pink noise of the ionic current (i.e., 1=f noise) measured with different filling liquids. The relative pink-noise amplitude is almost independent of concentration and pH for KCl solutions, but varies strongly using ionic liquids. In particular, we show that depending on the ionic liquid, the transport of charge carriers is strongly facilitated (low noise and higher conductivity than in the bulk) or jammed. These results show that the origin of the pink noise can be ascribed neither to fluctuations of the pore geometry nor to the pore wall charges, but rather to a cooperative effect on ions motion in confined geometry