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The effect of metal cluster coatings on carbon nanotubes
- Source :
- Nanotechnology. 17:496-500
- Publication Year :
- 2005
- Publisher :
- IOP Publishing, 2005.
-
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 NO2, 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.
- Subjects :
- Nanotube
Materials science
Mechanical Engineering
Schottky barrier
Nanoparticle
Bioengineering
Nanotechnology
General Chemistry
Carbon nanotube
engineering.material
Carbon nanotube field-effect transistor
law.invention
Carbon nanotube quantum dot
Adsorption
Coating
Mechanics of Materials
law
engineering
General Materials Science
Electrical and Electronic Engineering
Subjects
Details
- ISSN :
- 13616528 and 09574484
- Volume :
- 17
- Database :
- OpenAIRE
- Journal :
- Nanotechnology
- Accession number :
- edsair.doi...........f9e9c304c874695c49dd901135fa0cab