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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 33, Number 4
BKCSDE 33(4)
April 20, 2012 

The Interaction of CO to the Co(salen) Complex in to PEDOT:PSS Film and Sensor Application
Raheleh Memarzadeh, Farhad Panahi, Sirus Javadpour,* Ali Khalafi-Nezhad, Hui-Bog Noh, Yoon-Bo Shim*
Chemical sensor, PEDOT:PSS, Co(salen), Carbon monoxide
The interaction between carbon monoxide (CO) and a cobalt-salen complex (Co(salen)) was studied and applied to detect CO. The metal complex doped PEDOT:PSS film exhibited good sensitivity to CO and differentiate CO from other gases. The response of the composite to CO was reversible (RSD < 5%) change in resistance upon removal of CO gas from the test chamber. The effects of adding Co(salen) in the probe film on the response of the sensor were investigated using AFM, XPS, and FT-IR spectroscopy. The sensitivity of the sensor increased as the Co(salen) concentration enhanced as it increased from 0.0 to 1.5 wt. %, where the highest sensitivity (%ΔR/Ro) of −25.0 ± 0.05% was achieved with 1.0 wt. % Co(salen). The sensor containing probe exhibited a linear response (R2 = 0.983) in the range of 0.5 to 10.0% CO (v/v) N2, and the detection limit was 1.74% CO (v/v) in N2.
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