Title

Semiconducting Enriched Carbon Nanotube Aligned Arrays of Tunable Density and Their Electrical Transport Properties

Authors

Authors

B. K. Sarker; S. Shekhar;S. I. Khondaker

Comments

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Abbreviated Journal Title

ACS Nano

Keywords

semiconducting carbon nanotube; aligned array; solution-processed; dielectrophoresis; transistors; CHEMICAL-VAPOR-DEPOSITION; THIN-FILM TRANSISTORS; DIELECTROPHORESIS; ELECTRONICS; ELECTROKINETICS; PERFORMANCE; FABRICATION; NANOWIRES; SUBSTRATE; NETWORKS; Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience &; Nanotechnology; Materials Science, Multidisciplinary

Abstract

We demonstrate assembly of solution-processed semiconducting enriched (99%) single-walled carbon nanotubes (s-SWNTs) In an array with varying linear density via ac dielectrophoresis (DEP) and investigate detailed electronic transport properties of the fabricated. devices. We show that (I) the quality of the alignment varies with frequency of the applied voltage and that (ii) by varying the frequency and concentration of the solution, we control the linear density of the s-SWNTs In the array from 1/mu m to 25/mu m. The DEP assembled s-SWNT devices provide the opportunity to Investigate the transport property of the arrays. In the direct transport regime. Room temperature electron transport measurements of the, fabricated, devices show that with increasing nanotube density the device mobility increases while the current on-off ratio decreases dramatically. For the dense. array, the device current density was 16 mu A/mu m, on-conductance was, 390 mu S, and sheet resistance was 30 k Omega/square. These values are the best reported so far for any semiconducting nanotube array.

Journal Title

Acs Nano

Volume

5

Issue/Number

8

Publication Date

1-1-2011

Document Type

Article

Language

English

First Page

6297

Last Page

6305

WOS Identifier

WOS:000294085400027

ISSN

1936-0851

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