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Gas Sensing Mechanism of Gold Nanoparticles Decorated Single‐Walled Carbon Nanotubes
Author(s) -
Mubeen Syed,
Lim JaeHong,
Srirangarajan Aarti,
Mulchandani Ashok,
Deshusses Marc A.,
Myung Nosang V.
Publication year - 2011
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201100299
Subject(s) - carbon nanotube , colloidal gold , materials science , nanotechnology , nanoparticle , nanostructure , electrode , hydrogen sulfide , adsorption , field effect transistor , transistor , chemistry , organic chemistry , sulfur , metallurgy , physics , quantum mechanics , voltage
Abstract 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 H 2 S concentrations (≤100 ppb V ), 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 H 2 S was strongly dependent upon the size and number of gold nanoparticles, the sensing mechanism was independent of it.