Title :
Gas sensing properties of WO3-doped ZnO nanoparticles synthesized by flame spray pyrolysis
Author :
Siriwong, Chawarat ; Wetchakun, Katcharin ; Wisitsoraat, Anurat ; Phanichphant, Sukon
Author_Institution :
Nanosci. & Nanotechnol. Program, Chiang Mai Univ., Chiang Mai, Thailand
Abstract :
The flame-made (5/5) pure ZnO and WO3-doped ZnO nanoparticles containing 0.25, 0.50, and 0.75 mol% of WO3 were successfully synthesized by flame spray pyrolysis (FSP). These materials were studied for NO2, CO and H2 gas sensing at different gas concentrations and operating temperatures ranging from 300-400°C in dry air. The crystalline phase, morphology and size of the nanoparticles were characterized by XRD, BET, TEM, SEM and EDS in order to correlate physical properties with gas sensing performance. The gas-sensing results showed that WO3 doping significantly enhanced NO2 gas-sensing performance of ZnO nanoparticles. In addition, 0.5 mol% is found to be an optimal WO3 concentration which gives the highest sensitivity towards NO2.
Keywords :
II-VI semiconductors; X-ray chemical analysis; X-ray diffraction; carbon compounds; flames; gas sensors; hydrogen; nanoparticles; nanosensors; nitrogen compounds; pyrolysis; scanning electron microscopy; semiconductor doping; transmission electron microscopy; tungsten compounds; wide band gap semiconductors; zinc compounds; BET; CO; EDS; H2; NO2; SEM; TEM; XRD; ZnO:WO3; crystalline phase; doping; flame spray pyrolysis; gas concentrations; gas sensing; morphology; nanoparticles; sensitivity; size; temperature 300 degC to 400 degC; Crystalline materials; Crystallization; Fires; Morphology; Nanoparticles; Temperature distribution; Temperature sensors; Thermal spraying; X-ray scattering; Zinc oxide;
Conference_Titel :
Sensors, 2009 IEEE
Conference_Location :
Christchurch
Print_ISBN :
978-1-4244-4548-6
Electronic_ISBN :
1930-0395
DOI :
10.1109/ICSENS.2009.5398220
