TY - JOUR
T1 - Preparation of high surface area titania (TiO2) films and powders using particulate sol-gel route aided by polymeric fugitive agents
AU - Mohammadi, M. R.
AU - Cordero-Cabrera, M. C.
AU - Fray, D. J.
AU - Ghorbani, M.
PY - 2006/12/14
Y1 - 2006/12/14
N2 - High specific surface area (SSA) nanocrystalline powders and dip-coated TiO2 films have been prepared by particulate sol-gel route aided with polymeric fugitive agents (PFA), namely trehalose dihydrate (THD), polyethylene glycol (PEG6000) and hydroxypropyl cellulose (HPC). Powders obtained without PFA, heat-treated at 160 °C show a SSA of 181 m2/g, a value that could be increased up to 271 and 223 m2/g for samples heat-treated at 300 °C when PEG6000 and HPC were used, respectively, whereas SSA of 201 m2/g were achieved by using THD and subsequence heat-treating at 500 °C. Such surface area is one of the highest reported in the literature under these conditions. Crystallite sizes vary from 1 nm for as-produced powders up to 4 nm for powders heat-treated at 600 °C. It was found that crystallite size, microstructure, specific surface area and phase transformation are strongly dependent upon the PFA/TiO2 ratio and annealing temperature. Films produced under optimised conditions showed excellent microstructural properties for gas sensing applications.
AB - High specific surface area (SSA) nanocrystalline powders and dip-coated TiO2 films have been prepared by particulate sol-gel route aided with polymeric fugitive agents (PFA), namely trehalose dihydrate (THD), polyethylene glycol (PEG6000) and hydroxypropyl cellulose (HPC). Powders obtained without PFA, heat-treated at 160 °C show a SSA of 181 m2/g, a value that could be increased up to 271 and 223 m2/g for samples heat-treated at 300 °C when PEG6000 and HPC were used, respectively, whereas SSA of 201 m2/g were achieved by using THD and subsequence heat-treating at 500 °C. Such surface area is one of the highest reported in the literature under these conditions. Crystallite sizes vary from 1 nm for as-produced powders up to 4 nm for powders heat-treated at 600 °C. It was found that crystallite size, microstructure, specific surface area and phase transformation are strongly dependent upon the PFA/TiO2 ratio and annealing temperature. Films produced under optimised conditions showed excellent microstructural properties for gas sensing applications.
KW - Films
KW - Gas sensors
KW - Sol-gel processes
KW - Specific surface area
KW - TiO
UR - http://www.scopus.com/inward/record.url?scp=33749245142&partnerID=8YFLogxK
U2 - 10.1016/j.snb.2006.01.046
DO - 10.1016/j.snb.2006.01.046
M3 - Article
AN - SCOPUS:33749245142
VL - 120
SP - 86
EP - 95
JO - Sensors and Actuators B: Chemical
JF - Sensors and Actuators B: Chemical
SN - 0925-4005
IS - 1
ER -