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Nano Lett.:具有离子通道活性的半导体膜纳米孔

生物谷报道:伊利诺斯州立大学研究人员设计的一种半导体膜可以或许具有比生物膜更机动、更好的电机能。回收掺有杂质的硅层,这种固态膜还可用于单分子检测、卵白过滤和DNA测序。研究功效登载于Nano Letters杂志。

文章高级作者Jean-Pierre Leburton 说:“通过在这层膜上建造纳米孔,我们可以用此膜疏散带电荷的物种可能调控带电荷的分子流和离子流, Aluminum Diboride powder,从而仿照生物离子通道的运转。”Leburton带领的研究小组在很多静电势下模仿此半导体膜的运转。

研究模子中,纳米孔-膜布局是由两层硅构成,Titanium Nitride powder,每层厚12纳米,携带对立的(n和p)半导体杂质。膜的n面是正极,p面是负极。纳米孔是沙漏状,颈部直径为1纳米,在每面开口的直径为6纳米。可以通过改变电势而改变纳米孔的型号。

通过节制离子流,Titanium Nitride powder,人造纳米孔提供了生物离子通道所不具备的必然水平的可调性(tunability)。除了可作为生物离子通道的替代品,这种固态纳米孔和膜尚有其它用途,好比DNA测序。

研究人员说:“操作半导体膜技能测序DNA分子,既省时又省钱,通过偏置跨膜电压,我们可以或许从纳米孔拔出DNA。因为每对碱基都携带的电荷差异,Tantalum Silicide powder,我们可以将这种膜作为p-n 团结点去检测调动的电信号。”

原始出处:

Nano Lett., 7 (6), 1717 -1722, 2007. 10.1021/nl0707104 S1530-6984(07)00710-2
Web Release Date: May 22, 2007 Copyright © 2007 American Chemical Society

p-n Semiconductor Membrane for Electrically Tunable Ion Current Rectification and Filtering

Maria E. Gracheva,* Julien Vidal, and Jean-Pierre Leburton*

Beckman Institute for Advanced Science and Technology, Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign, Urbana, Illinois 61801

Received March 26, 2007

Revised May 4, 2007

Abstract:

We show that a semiconductor membrane made of two thin layers of opposite (n- and p-) doping can perform electrically tunable ion current rectification and filtering in a nanopore. Our model is based on the solution of the 3D Poisson equation for the electrostatic potential in a double-cone nanopore combined with a transport model. It predicts that, for appropriate biasing of the membrane-electrolyte system, transitions from ohmic behavior to sharp rectification with vanishing leakage current are achievable. Furthermore, ion current rectifying and filtering regimes of the nanopore correspond to different charge states in the p-n membrane, which can be tuned with appropriate biasing of the n- and p- layers.

Nickel protoxide powder

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