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·190·
IMP &HIRFL Annual
Report 2015
3-83Influence of Electrolyte Concentration on the Rectification
of Single Conical Nanopores
Wei Junzhe,Du Guanghua,Guo Jinlong,Liu Wenjing,Chen Hao and Wu Ruqun
A fundamental understanding of the rectification effect in the nanopores and the ion transport near charged surfaces on the nanometer length scale can push towards high performance energy storage devices [1].Typically,nanopores are constructed within polymers,glass,or silica,and have internal and external surfaces that are electri-cally charged.In an electrolyte,the charged surfaces attract counter ions from solution,resulting in the creation of an electric double layer (EDL)that screens the surface charge over a distance that is dependent primarily on the electrolyte concentration,but also the temperature [2].To the conical nanopores in polymers,when the thickness of the EDL is comparable to that of the tip of the conical nanopore,the EDL will influence the ion
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transport and lead to non-linear I −V behavior.
伤心的意思齐梁故里Fig.1(color online)(a)Single conical nanopore preparation process schematics.(b)Etching device schematic.
In this study,we prepared of single conical nanopores in polyethylene terephthalate (PET)films using single Kr ion hit and chemical etching.The films were irradiated with single Kr ions at the HIRFL microbeam,then the single latent ion track was chemical etched from one side with sodium hydroxid
e solution and a stopping so-lution (1mol/L HCOOH and 1mol/L KCl)that neutralizes the etchant on the other side at 60◦C (Fig.1),in a home-made etching cell.The transmembrane ionic current during the etching process was recorded by a Keithley 6482picoammeter/voltage source.To study the ion conduction of this single conical nanopore in KCl solution,the current-voltage (I −V )characteristic was measured in the same conductivity cell with Ag/AgCl electrodes.A scan-
Fig.2Rectification coefficient γmeasured at 2V,
γ=|I （U -）/(U +)|.ning voltage varied from -2to +2V was applied on
the ba of the pore while the tip was connected to the
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ground.The measurements were performed at room
temperature.
We studied the influence of electrolyte concentration
on the current rectification.The concentration of KCl
solution ranged from 0.0001to 1mol/L,and the mea-
sured results are shown in Fig.2.Although the current
amplitude incread monotonously with KCl concentra-
tion,the rectification coefficient γreached its maximum
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梦见杀狗是什么预兆with a KCl concentration of about 5mmol/L.This rec-
tification behavior is similar to the previous reports [3],
and the mechanism and modeling will be further inves-tigated.
References
[1]Rukshan T.Perera,P.Johnson,Martin A.Edwards,Henry S.White,Journal of Physical Chemistry C,119(2015)24299.
[2]K.Olejniczak,O.L.Orelovich,P.Y.Apel,Nucl.Instr.and Meth.B,365(2015)646.
[3] B.Schiedt,K.Healy,A.P.Morrison,et al.,Nucl.Instr.and Meth.B,236(2005)109.补气补血的食物
