Effect of concentration gradient on ionic current rectification in polyethyleneimine modified glass nano-pipettes.
Ion current rectification dependent on the concentration gradient of KCl solutions was systematically investigated in polyethyleneimine modified glass nano-pipettes with inner diameter of 105 nm. Peak shape dependence of the rectification factor on outer KCl solution concentration was observed when inner KCl solution with concentration from 1 mM to 500 mM was used. The peak shape dependence was also observed when the concentrations of the inner and outer KCl solutions were identically controlled. The peak shape in the ion current rectification could be explained by the ion conductance changes through the conical nano-pipette, which result from modulation of ion concentration.
1] Division of Quantum Phases and Devices, Department of Physics, Konkuk University, Seoul 143-701, Republic of Korea [2].
Xiao Long
XL
Deng
1] Division of Quantum Phases and Devices, Department of Physics, Konkuk University, Seoul 143-701, Republic of Korea [2].
Tomohide
T
Takami
Division of Quantum Phases and Devices, Department of Physics, Konkuk University, Seoul 143-701, Republic of Korea.
Jong Wan
JW
Son
Division of Quantum Phases and Devices, Department of Physics, Konkuk University, Seoul 143-701, Republic of Korea.
Eun Ji
EJ
Kang
Division of Quantum Phases and Devices, Department of Physics, Konkuk University, Seoul 143-701, Republic of Korea.
Tomoji
T
Kawai
Division of Quantum Phases and Devices, Department of Physics, Konkuk University, Seoul 143-701, Republic of Korea.
Bae Ho
BH
Park
D004553:Electric Conductivity; D005898:Glass / Q000737:chemistry; D007477:Ions / Q000737:chemistry*; D058608:Nanopores; D049329:Nanostructures; D009994:Osmolar Concentration; D011094:Polyethyleneimine / Q000737:chemistry; D011189:Potassium Chloride / Q000737:chemistry*; D013499:Surface Properties
D007477:Ions; D011189:Potassium Chloride; D011094:Polyethyleneimine