Low and high temperature TiO2 oxygen sensors

Kirner, U.; Schierbaum, K.D.; Göpel, Wolfgang; Leibold, B.; Nicoloso, N.; Weppner, W.; Fischer, Dieter; Chu, W. F.

doi:10.1016/0925-4005(90)80181-x

Cited by 152 publications

(51 citation statements)

References 12 publications

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“…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.…”

Section: Introductionmentioning

confidence: 99%

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

Chen

Singh

2010

Sensors and Actuators B: Chemical

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Section: Introductionmentioning

confidence: 99%

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

Chen

Singh

2010

Sensors and Actuators B: Chemical

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“…[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.…”

Section: Introductionmentioning

confidence: 99%

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

Arbiol

Cerdá

Dezanneau

et al. 2002

Journal of Applied Physics

308

184

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We study the influence of Nb doping on the TiO 2 anatase-to-rutile phase transition, using combined transmission electron microscopy, Raman spectroscopy, x-ray diffraction and selected area electron diffraction analysis. This approach enabled anatase-to-rutile phase transition hindering to be clearly observed for low Nb-doped TiO 2 samples. Moreover, there was clear grain growth inhibition in the samples containing Nb. The use of high resolution transmission electron microscopy with our samples provides an innovative perspective compared with previous research on this issue. Our analysis shows that niobium is segregated from the anatase structure before and during the phase transformation, leading to the formation of NbO nanoclusters on the surface of the TiO 2 rutile nanoparticles.

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“…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…”

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confidence: 99%

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

et al. 2000

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Mixed oxides containing anatase and 5-20 mol% alumina have been synthesized from a precursor sol containing acetic Ž . acid modified titanium isopropoxide and boehmite AlOOH . The resultant oxides retain considerable anatase phase at 10008C and have specific surface area many times higher than that of pure titania. A composite precursor containing titania-20 mol% alumina after calcination at 4508C, has a specific surface area as high as 318 m 2 rg compared to a value of 100 m 2 rg for pure titania prepared under identical conditions. The uniform dispersion of the nanoparticles of alumina in the titania gel matrix causes reduction in the anataseranatase contact points and thus results in a decrease of nucleation sites leading to increase in thermal stability of anatase phase. The high surface area and porosity could arise from the highly branched acetate polymeric gel. The sintered density of compacts derived from mixed oxides is also brought down considerably compared to pure titania counter parts. q

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Low and high temperature TiO2 oxygen sensors

Cited by 152 publications

References 12 publications

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

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

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

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

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