TY - JOUR
T1 - Thick-film gas sensors based on vanadium-titanium oxide powders prepared by sol-gel synthesis
AU - Carotta, Maria Cristina
AU - Ferroni, Matteo
AU - Gherardi, Sandro
AU - Guidi, Vincenzo
AU - Malagù, Cesare
AU - Martinelli, Giuliano
AU - Sacerdoti, Michele
AU - Di Vona, Maria Luisa
AU - Licoccia, Silvia
AU - Traversa, Enrico
PY - 2004/1/1
Y1 - 2004/1/1
N2 - Two titania powders modified by 10 at.% of vanadium were prepared by two different sol-gel routes. The powders fired at 650 °C had the rutile structure. These powders were used to produce prototype thick-film sensors. Four series of thick-film samples were fabricated by screen-printing, fired for 1 h at 650 and 850 °C. The morphology and gas-sensing properties were examined and compared with those of pure and Ta-added titania films, previously studied by the authors. Ta addition inhibited the anatase-to-rutile phase transformation during heating and was also effective in keeping the TiO2 grain size in the nanometre range. On the contrary, V addition facilitated the anatase-to-rutile phase transformation. Thick films obtained from the two powders had similar conductance behaviour vs. temperature. The gas response of the films was affected by both the grain size and firing temperature.
AB - Two titania powders modified by 10 at.% of vanadium were prepared by two different sol-gel routes. The powders fired at 650 °C had the rutile structure. These powders were used to produce prototype thick-film sensors. Four series of thick-film samples were fabricated by screen-printing, fired for 1 h at 650 and 850 °C. The morphology and gas-sensing properties were examined and compared with those of pure and Ta-added titania films, previously studied by the authors. Ta addition inhibited the anatase-to-rutile phase transformation during heating and was also effective in keeping the TiO2 grain size in the nanometre range. On the contrary, V addition facilitated the anatase-to-rutile phase transformation. Thick films obtained from the two powders had similar conductance behaviour vs. temperature. The gas response of the films was affected by both the grain size and firing temperature.
KW - Electrical properties
KW - Gas sensors
KW - Grain size
KW - Sol-gel processes
KW - TiO
UR - http://www.scopus.com/inward/record.url?scp=0942280292&partnerID=8YFLogxK
U2 - 10.1016/S0955-2219(03)00418-7
DO - 10.1016/S0955-2219(03)00418-7
M3 - Article
AN - SCOPUS:0942280292
VL - 24
SP - 1409
EP - 1413
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
SN - 0955-2219
IS - 6
ER -