Gas sensing mechanism of gold nanoparticles decorated single-walled carbon nanotubes

Journal Article

Metal nanoparticles decorated single-walled carbon nanotubes (SWNTs) can lead to considerable enhancement in sensing performance towards different gas analytes, however the sensing mechanism was not clearly elucidated. The detailed sensing mechanism of hybrid gold-SWNT nanostructures toward hydrogen sulfide was investigated using field effect transistor (FET) transfer characteristics. At low H2S concentrations (≤100ppbV), FET transfer characteristics show that the gold nanoparticles at the surface of SWNTs acted as nano-Schottky barriers to predominately modulate transconductance upon exposure to unfunctionalized SWNTs on gold electrodes which showed little or no response upon exposure. Although the sensitivity of Au/SWNT toward H2S was strongly dependent upon the size and number of gold nanoparticles, the sensing mechanism was independent of it. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Full Text

Duke Authors

Cited Authors

  • Mubeen, S; Lim, JH; Srirangarajan, A; Mulchandani, A; Deshusses, MA; Myung, NV

Published Date

  • November 1, 2011

Published In

Volume / Issue

  • 23 / 11

Start / End Page

  • 2687 - 2692

Electronic International Standard Serial Number (EISSN)

  • 1521-4109

International Standard Serial Number (ISSN)

  • 1040-0397

Digital Object Identifier (DOI)

  • 10.1002/elan.201100299

Citation Source

  • Scopus