TY - JOUR
T1 - Application of m-CNTs/NaClO4/Ppy to a fast response, room working temperature ethanol sensor
AU - Wu, Ren Jang
AU - Huang, Yu Ching
AU - Yu, Ming Ru
AU - Lin, Tzu Hsuan
AU - Hung, Shih-Lin
PY - 2008/8/28
Y1 - 2008/8/28
N2 - A new blended material, m-CNTs/NaClO4/Ppy, was developed as a gas sensor to detect ethanol concentrations at room temperature. The sensing material polypyrrole (Ppy) was synthesized in situ by UV-photo-polymerization. The multiwall carbon nanotubes (m-CNTs) added enhanced the short-term repeatability of the Ppy-sensing material. The relative resistance variation (Rethanol/Rair) of m-CNTs/NaClO4/Ppy was 1.193 when exposed to ethanol of 30,000 ppm. The sensor response and recovery times (both 20 s) were very short to this concentration. An unstable baseline of the sensor was explained by theoretical calculation of molecular dynamics made for ethanol adsorption on polypyrrole, which revealed formation of a new bond, N-H⋯O. Adsorption energy decreased with increasing the number of ethanol molecules adsorbed and was 0.8 kcal/mol at eight adsorbed molecules. Sensor responses of three different Ppy samples were measured to ethanol concentrations of 18,000-40,000 ppm.
AB - A new blended material, m-CNTs/NaClO4/Ppy, was developed as a gas sensor to detect ethanol concentrations at room temperature. The sensing material polypyrrole (Ppy) was synthesized in situ by UV-photo-polymerization. The multiwall carbon nanotubes (m-CNTs) added enhanced the short-term repeatability of the Ppy-sensing material. The relative resistance variation (Rethanol/Rair) of m-CNTs/NaClO4/Ppy was 1.193 when exposed to ethanol of 30,000 ppm. The sensor response and recovery times (both 20 s) were very short to this concentration. An unstable baseline of the sensor was explained by theoretical calculation of molecular dynamics made for ethanol adsorption on polypyrrole, which revealed formation of a new bond, N-H⋯O. Adsorption energy decreased with increasing the number of ethanol molecules adsorbed and was 0.8 kcal/mol at eight adsorbed molecules. Sensor responses of three different Ppy samples were measured to ethanol concentrations of 18,000-40,000 ppm.
KW - Ethanol sensor
KW - Multiwall carbon nanotubes (m-CNTs)
KW - Polypyrrole
KW - UV-photo polymerization
UR - http://www.scopus.com/inward/record.url?scp=49749121167&partnerID=8YFLogxK
U2 - 10.1016/j.snb.2008.04.033
DO - 10.1016/j.snb.2008.04.033
M3 - Article
AN - SCOPUS:49749121167
SN - 0925-4005
VL - 134
SP - 213
EP - 218
JO - Sensors and Actuators, B: Chemical
JF - Sensors and Actuators, B: Chemical
IS - 1
ER -