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Multi-wall carbon nanotube networks as potential resistive gas sensors for organic vapor detection

SYSNO ASEP	0359583
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Multi-wall carbon nanotube networks as potential resistive gas sensors for organic vapor detection
Author(s)	Slobodian, P. (CZ) Říha, Pavel (UH-J)_{SAI, ORCID, RID} Lengálová, A. (CZ) Svoboda, P. (CZ) Sáha, P. (CZ)
Source Title	Carbon. - : Elsevier - ISSN 0008-6223 Roč. 49, č. 7 (2011), s. 2499-2507
Number of pages	9 s.
Language	eng - English
Country	US - United States
Keywords	carbon nanotube network ; KMnO₄ oxidation ; electrical resistance ; organic vapor detection ; adsorption/desorption cycles
Subject RIV	JB - Sensors, Measurment, Regulation
CEZ	AV0Z20600510 - UH-J (2005-2011)
UT WOS	000289663100037
EID SCOPUS	79952985886
DOI	10.1016/j.carbon.2011.02.020
Annotation	The sensitivity of multi-wall carbon nanotube (MWCNT) networks of randomly entangled pure nanotubes and those oxidized with acidic KMnO₄ to various organic solvent vapors (iso-pentane, diethyl ether, acetone and methanol) has been investigated by resistance measurements. The solvents had different polarities given by Hansen solubility parameters and different volume fractions of saturated vapors defined by the vapor pressure. The results show that the network electrical resistance increases when exposed to organic solvent vapors, and a reversible reaction is observed when the network is removed from the vapors. The reaction with KMnO₄ increases oxygen content on the nanotube surface and causes lower porosity of MWCNT network as well as higher electrical resistance, which improves the network selectivity to polar solvents. The investigated MWCNT networks could be potentially used as sensing elements for sensitive and selective organic vapor switches.
Workplace	Institute of Hydrodynamics
Contact	Soňa Hnilicová, hnilicova@ih.cas.cz, Tel.: 233 109 003
Year of Publishing	2012

Number of the records: 1