Low and high temperature TiO2 oxygen sensors

Highly hydrogen-sensitive SnO2 nanoscale-particle films with platinum electrodes

“…H 2 molecules adsorbed on the Pt or the Pd electrode surface are believed to break into hydrogen atoms which migrate into the metal bulk or even to the metal-oxide (n-type) contact, reducing the work function of the metal and therefore lowering the Schottky barrier height (SBH) at the metal/oxide interface. This effect has been studied and applied to develop hydrogen sensors based on Pd (or Pt)/SiO 2 MOS structures [47], as well as those based on Pd (or Pt)/TiO 2 (or SnO 2 ) Schottky diodes [48][49][50][51][52][53][54]. Although fabrication of Pd (or Pt)/TiO 2 Schottky devices and their sensing properties to reactive gases were thoroughly investigated during the last two decades [49][50][51]53,54], gas-sensing studies on Pt/SnO 2 diodes were much less frequently reported than the former.…”

Effects of Nb doping on the TiO2 anatase-to-rutile phase transition

“…[1][2][3][4] Its stability at temperatures up to 700°C makes TiO 2 a suitable gas sensor material for harsh environments, such as the flue ducts of cars. [5][6][7] TiO 2 can crystallize in different structures, rutile being the stable one.…”

Synthesis of thermally stable, high surface area anatase–alumina mixed oxides

“…The increased surface area of 105 m 2 rg is attributed to the contribution from the modified gel. Addition of 20 mol% alumina in the form of boehmite further increases the specific surface area of the mixture of oxides to as high as 318 m 2 rg with a pore volume of 0.3242 cm 3 rg. This large enhancement in surface area is not only due to the contribution from the alumina component Ž…”