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Park, Noejung
Computational Physics & Electronic Structure Lab
Research Interests
  • Electronic structure calculation, computational physics, computational material science

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The effect of metal cluster coatings on carbon nanotubes

Cited 40 times inthomson ciCited 39 times inthomson ci
Title
The effect of metal cluster coatings on carbon nanotubes
Author
Kim, BKPark, NoejungNa, PSSo, HMKim, JJKim, HKong, KJChang, HRyu, BHChoi, YMLee, JO
Keywords
FIELD-EFFECT TRANSISTORS; CHEMICAL SENSORS; LOGIC GATES; ADSORPTION; NANOWIRES; AMMONIA; DEVICES
Issue Date
2006-01
Publisher
IOP PUBLISHING LTD
Citation
NANOTECHNOLOGY, v.17, no.2, pp.496 - 500
Abstract
The electrical transport and chemical sensing properties of single-walled carbon nanotube field effect transistors (SWNT-FETs) coated with metal clusters have been investigated. The source-drain current passing through an SWNT-FET coated with Pd nanoparticles showed no change over a range of gate voltages. Nevertheless, the magnitude of the current was still sensitive towards NO 2, NH3 and H2 exposure. The Pd nanoparticles coating on the nanotube generated hole carriers, which either became diluted upon NH3 or H2 adsorption, or enhanced upon NO2 adsorption. Unlike the ohmic behaviour demonstrated by SWNT-FETs coated with Pd nanoparticles, the transfer characteristics of SWNT-FETs coated with Al nanoparticles revealed Schottky barrier formations at the metal-nanotube contacts. Here, the conductance through the nanotube decreased, while the device sensitivity towards NO2 and NH3 gases improved greatly. We suggest that coating SWNT-FETs with metal nanoparticles could be exploited for the development of highly sensitive nanotube-based molecular sensors.
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DOI
10.1088/0957-4484/17/2/025
ISSN
0957-4484
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PHY_Journal Papers
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