关键词：
纳米通道;单壁碳纳米管;离子电流;纳米农业检测传感器
摘 要：
[目的]对纳米通道中离子电流调制机制的理解,是发展纳米农业检测传感器的关键。[方法]采用分子动力学模拟的方法,研究受限纳米通道中单壁碳纳米管的荷电量对离子电流阻塞的影响。[结果]仿真结果表明:电中性的单壁碳纳米管进入通道中时产生的阻塞电流始终小于基准电流。在碳纳米管带电荷且荷电量增加的情况下,当溶液浓度较低时,阻塞电流大于基准电流;当溶液浓度较高时,阻塞电流小于基准电流,出现电流交叉现象。[结论]单壁碳纳米管过孔时其体积占位对电渗流的影响以及其本身荷电量对纳米通道中离子浓度的影响相互竞争,共同决定着纳米通道中的离子电流。
译 名：
Mechanism of the impact of single-walled carbon nanotubes on ionic current in a nano-channel
作 者：
JI Changying;PEI Xu;GE Yanyan;College of Engineering,Nanjing Agricultural University;
单 位：
JI Changying%PEI Xu%GE Yanyan%College of Engineering,Nanjing Agricultural University
关键词：
nano-channel;;single-walled carbon nanotubes;;ionic current;;nano agricultural detection sensor
摘 要：
[Objectives]Understanding the mechanism of ionic current modulation in nano-channels is the key to the development of nano agricultural detection sensors. [Methods]Molecular dynamics simulation was used to study the impact of charge density of single-walled carbon nanotubes on the ionic current blockades in a confined nano-channel. [Results]The simulation results indicated that when an electrically neutral single-walled carbon nanotubes entered the nano-channel,the blockade current was always less than the reference current. With increasing charge number on the carbon nanotube,and at lower solution concentrations,the blockade current was greater than the reference current. When the solution concentration was high,the blockade current was less than the reference current,and the phenomenon of current crossover occurred. [Conclusions]The effect of the volume occupied by the singlewalled carbon nanotubes on electroosmosis and the effect of their own charge on the ion concentration in the nano-channel compete with each other,and together determine the ionic current in the nano-channel.
