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Surface Conductance Induced Dielectrophoresis of Semiconducting Single-Walled Carbon Nanotubes

Krupke, Ralph and Hennrich, Frank and Kappes, Manfred M. and Löhneysen, Hilbert von (2004):
Surface Conductance Induced Dielectrophoresis of Semiconducting Single-Walled Carbon Nanotubes.
In: Nano Letters, 4 (8), pp. 1395-1399, ISSN 1530-6984,
[Online-Edition: http://dx.doi.org/10.1021/nl0493794],
[Article]

Abstract

Dielectrophoresis on surfactant-stabilized single-walled carbon nanotube (SWNT) suspensions has been demonstrated to separate metallic from semiconducting tubes by their different electric field-induced polarizabilities. Here we report that the interaction between SWNTs and the surfactant induces a nanotube surface conductance which gives rise to a unique electric field frequency dependence of the nanotube dielectrophoresis. We observe a surfactant concentration dependent crossover frequency enabling separation of metallic from semiconducting SWNTs at high frequency and deposition of metallic and semiconducting SWNTs at low frequency − both being important aspects for building nanotube-based electronics. Moreover, the data demonstrate that the theoretical description of dielectrophoretic forces is valid beyond the dimensions of cells or viruses.

Item Type: Article
Erschienen: 2004
Creators: Krupke, Ralph and Hennrich, Frank and Kappes, Manfred M. and Löhneysen, Hilbert von
Title: Surface Conductance Induced Dielectrophoresis of Semiconducting Single-Walled Carbon Nanotubes
Language: English
Abstract:

Dielectrophoresis on surfactant-stabilized single-walled carbon nanotube (SWNT) suspensions has been demonstrated to separate metallic from semiconducting tubes by their different electric field-induced polarizabilities. Here we report that the interaction between SWNTs and the surfactant induces a nanotube surface conductance which gives rise to a unique electric field frequency dependence of the nanotube dielectrophoresis. We observe a surfactant concentration dependent crossover frequency enabling separation of metallic from semiconducting SWNTs at high frequency and deposition of metallic and semiconducting SWNTs at low frequency − both being important aspects for building nanotube-based electronics. Moreover, the data demonstrate that the theoretical description of dielectrophoretic forces is valid beyond the dimensions of cells or viruses.

Journal or Publication Title: Nano Letters
Volume: 4
Number: 8
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Fachgebiet Molekulare Nanostrukturen
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 08 Nov 2011 13:33
Official URL: http://dx.doi.org/10.1021/nl0493794
Identification Number: doi:10.1021/nl0493794
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