Muhammad Rashid1, Tae-Sun Jun2, and Yong Shin Kim1,2,*
1Department of Applied Chemistry, Hanyang University, Ansan 426-791, South Korea
2Department of Bionano Engineering, Hanyang University, Ansan 426-791, South Korea
A Pt nanoparticle-decorated multiwall carbon nanotube (Pt-MWNT) electrode was
prepared on Nafion by a hot-pressing at relatively low temperature. This electrode exhibited
an intricate entangled, nanoporous structure as a result of gathering highly anisotropic Pt-
MWNTs. Individual Pt nanoparticles were confirmed to have a polycrystalline face-centered
cubic structure with an average crystal size of around 3.5 nm. From the cyclic voltammograms
for hydrogen redox reactions, the Pt-MWNT electrode was found to have a similar electrochemical
behavior to polycrystalline Pt, and a specific electrochemical surface area of
2170 cm2mg?1. Upon exposure to hydrogen analyte, the Pt-MWNT/Nafion electrode demonstrated
a very high sensitivity of 3.60 μA ppm?1 and an excellent linear response over the concentration
range of 100-1000 ppm. Moreover, this electrode was also evaluated in terms of
response and recovery times, reproducibility, and long-term stability. Obtained results revealed
good sensing performance in hydrogen detection.
Keyword : Hydrogen sensor; Electrochemical gas sensor; Pt-MWNT electrode; Hot-pressing