Title :
A room temperature polyaniline nanofiber hydrogen gas sensor
Author :
Sadek, A.Z. ; Trinchi, A. ; Wlodarski, W. ; Kalantar-zadeh, K. ; Galatsis, K. ; Baker, C. ; Kaner, R.B.
Author_Institution :
Sch. of Electr. & Comput. Eng., RMIT Univ., Melbourne, ACT
fDate :
Oct. 30 2005-Nov. 3 2005
Abstract :
Electro-conductive polyaniline (PANI) nanofiber based surface acoustic wave (SAW) gas sensors have been investigated with hydrogen (H 2) gas. A template-free, rapidly mixed method was employed to synthesize polyaniline nanofibers using chemical oxidative polymerization of aniline. The nanofibers were deposited onto a layered ZnO/64deg YX LiNbO3 SAW transducer for gas sensing applications. The novel sensor was exposed to various concentrations of H2 gas at room temperature. The sensor response, defined as the relative variation in operating frequency of oscillation due to the introduction of the gas, was 3.04 kHz towards a 1% H2 concentration. A relatively fast response time of 8 sec and a recovery time of 60 sec with good repeatability were observed at room temperature. Due to room temperature operation, the novel gas sensor is promising for environmental and industrial applications
Keywords :
gas sensors; hydrogen; polymer films; polymerisation; surface acoustic wave sensors; surface acoustic wave transducers; 3.04 kHz; 60 s; 8 s; SAW transducer; ZnO-LiNbO3; chemical oxidative polymerization; hydrogen gas sensor; polyaniline nanofibers; Acoustic waves; Chemical sensors; Frequency; Gas detectors; Hydrogen; Polymers; Surface acoustic waves; Temperature sensors; Transducers; Zinc oxide;
Conference_Titel :
Sensors, 2005 IEEE
Conference_Location :
Irvine, CA
Print_ISBN :
0-7803-9056-3
DOI :
10.1109/ICSENS.2005.1597672
