title: Surface-area-controlled synthesis of porous TiO2thin films for gas-sensing applications.
abstract: Surface-area-controlled porous TiO2thin films were prepared via a simple sol-gel chemical route, and their gas-sensing properties were thoroughly investigated in the presence of typical oxidizing NO2gas. The surface area of TiO2thin films was controlled by developing porous TiO2networked by means of controlling the TiO2-to-TTIP (titanium isopropoxide, C12H28O4Ti) molar ratio, where TiO2nanoparticles of size ∼20 nm were used. The sensor's response was found to depend on the surface area of the TiO2thin films. The porous TiO2thin-film sensor with greater surface area was more sensitive than those of TiO2thin films with lesser surface area. The improved sensing ability was ascribed to the porous network formed within the thin films by TiO2sol. Our results show that surface area is a key parameter for obtaining superior gas-sensing performance; this provides important guidelines for preparing and using porous thin films for gas-sensing applications.
authors.affiliation: Surface R&D Group, Korea Institute of Industrial Technology (KITECH), 156, Gaetbeol-ro, Yeonsu-gu, Incheon 21999, Korea.
authors.forename: Jae Young
authors.initials: JY
authors.lastname: Park
authors.forename: Ho-Hyoung
authors.initials: HH
authors.lastname: Kim
authors.forename: Dolly
authors.initials: D
authors.lastname: Rana
authors.forename: Deepika
authors.initials: D
authors.lastname: Jamwal
authors.forename: Akash
authors.initials: A
authors.lastname: Katoch