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Hybrid ZnO/SWNT Nanostructures Based Gas Sensor
Author(s) -
Hernández Sandra C.,
Kakoullis James,
Lim Jae Hong,
Mubeen Syed,
Hangarter Carlos M.,
Mulchandani Ashok,
Myung Nosang V.
Publication year - 2012
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.201200135
Subject(s) - crystallinity , detection limit , materials science , carbon nanotube , selectivity , nanoparticle , nanostructure , zinc , nanotechnology , chemical engineering , microstructure , chemistry , chromatography , organic chemistry , composite material , metallurgy , engineering , catalysis
Zinc oxide (ZnO) nanoparticles decorated single walled carbon nanotubes (SWNTs) were electrochemically synthesized where the deposition conditions were systematically explored to tailor the size, density, and microstructure of the ZnO nanoparticles and correlated to the gas sensing performance. Room temperature conductometric detection of various analytes including CO, CO 2 , NO 2 , NH 3 , SO 2 , H 2 S with ZnO/SWNT hybrid nanostructures demonstrated uncharacteristic selectivity towards H 2 S with little to no response for the other analytes examined. Optimal ZnO/SWNTs gas sensor devices showed a significantly increased in H 2 S sensitivity over unfunctionalized SWNT networks (i.e. 4.96 % per ppm V vs. 0.225 % ppm V ) with a lower detection limit in the ppb range. Additionally, the H 2 S sensing performance was greatly improved by enhancing the crystallinity of ZnO nanoparticles.