Effects of ionic surfactant adsorption on single-walled carbon nanotube thin film devices in aqueous solutions.

Journal Article (Letter)

Field-effect transistors were fabricated using high-density single-walled carbon nanotube (SWNT) thin films directly grown on suitable substrates. Such approach eliminated the variations of device behaviors in individual SWNT devices by utilizing a large number of SWNTs in each device. We have found that the behaviors of such devices are closely related to the surface charge densities around SWNTs in aqueous solutions. Adsorption of ionic surfactants on the surface could significantly modulate the device characteristics, which could be detected by measuring the conductance of the devices. The devices could be tuned to be sensitive to either anionic or cationic surfactants by tailoring the surface properties of SiO(2) substrates around SWNTs. This effect could be potentially used to design chemical and biological sensors.

Full Text

Duke Authors

Cited Authors

  • Fu, Q; Liu, J

Published Date

  • February 2005

Published In

Volume / Issue

  • 21 / 4

Start / End Page

  • 1162 - 1165

PubMed ID

  • 15697254

Electronic International Standard Serial Number (EISSN)

  • 1520-5827

International Standard Serial Number (ISSN)

  • 0743-7463

Digital Object Identifier (DOI)

  • 10.1021/la047561e


  • eng