Sensitive detection of H2S using gold nanoparticle decorated single-walled carbon nanotubes.

Published

Journal Article

Herein, we demonstrate that highly sensitive conductometric gas nanosensors for H(2)S can be synthesized by electrodepositing gold nanoparticles on single-walled carbon nanotube (SWNT) networks. Adjusting the electrodeposition conditions allowed for tuning of the size and number of gold nanoparticles deposited. The best H(2)S sensing performance was obtained with discrete gold nanodeposits rather than continuous nanowires. The gas nanosensors could sense H(2)S in air at room temperature with a 3 ppb limit of detection. The sensors were reversible, and increasing the bias voltage reduced the sensor recovery time, probably by local Joule heating. The sensing mechanism is believed to be based on the modulation of the conduction path across the nanotubes emanating from the modulation of electron exchange between the gold and carbon nanotube defect sites when exposed to H(2)S.

Full Text

Duke Authors

Cited Authors

  • Mubeen, S; Zhang, T; Chartuprayoon, N; Rheem, Y; Mulchandani, A; Myung, NV; Deshusses, MA

Published Date

  • January 2010

Published In

Volume / Issue

  • 82 / 1

Start / End Page

  • 250 - 257

PubMed ID

  • 19968250

Pubmed Central ID

  • 19968250

Electronic International Standard Serial Number (EISSN)

  • 1520-6882

International Standard Serial Number (ISSN)

  • 0003-2700

Digital Object Identifier (DOI)

  • 10.1021/ac901871d

Language

  • eng