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April 16-17, 2018 Las Vegas, Nevada, USA
2
nd
Edition of
Graphene & Semiconductors | Diamond Graphite & Carbon Materials Conference
6
th
Edition of
Smart Materials & Structures Conference
&
Journal of Material Sciences and Engineering| ISSN: 2169-0022 | GDCSM-2018 | Volume: 7
Methanol sensing material based on conductive polyindole
Katesara Phasuksom
1
, Walaiporn Prissanaroon-Ouajai
2
and
Anuvat Sirivat
1
1
Chulalongkorn University, Bangkok
2
King Mongkut’s University of Technology North Bangkok, Bangkok
P
olyindole (PIn) was applied as methanol sensing material in this work. The electrical conductivity change of PIn was monitored
at room temperature. The electrical responses of PIn under various vapors from non-polar, low polar, and high polar solvents
were also investigated; the highest relative responses of conductivity were observed when exposed to vapors from high polar solvents,
especially methanol possessing the highest dielectric constant and hydrogen bonding interaction compared to other vapors inducing
the highest interaction to PIn. The discrimination analysis of sensor was evaluated by the principal component analysis (PCA), it was
demonstrated that the sensor possessed the good discrimination efficiency towards high polar vapors. Moreover, the sensor response
depended on the doping mole ratio, the dPIn/FeCl
3
with the doping mole ratio of 10:1 provided the highest relative response of
conductivity of 57.83 at the low concentration of 11.36 ppm, which nitrogen was used as a base gas. The sensitivity to methanol vapor
obtained from the calibration curve in the methanol concentration range of 1.14-11.36 ppm was 5.27 ppm
-1
with the correlation
coefficient (R2) of 0.9965, and the theoritical limit of detection was as low as 0.048 ppm. The sensor based on the dPIn/FeCl
3
10:1
reported here is a good candidate for use as a methanol sensing material.
pkatesara.p@outlook.comJ Material Sci Eng 2018, Volume: 7
DOI: 10.4172/2169-0022-C3-098