Sensitization of TiO2/SnO2 nanocomposites for gas detection

Nanostructured TiO2-based gas sensors with enhanced sensitivity to reducing gases

“…However, due to their small dimensionality and good dispersion on TiO 2 substrates, a large number of active sites are created and depletion layer thickness decreases. Our previously proposed sensing mechanism [7] for this semiconductor coupled system remains in good correlation with the obtained results.…”

“…In sensor technology this n-type semiconductor is frequently considered as a promising material for gas detection applications [6]. It has excellent sensitivity and selectivity for many different gases such as H 2 [7], NO 2 [8], NO x [9], CO [10], NH 3 [11], H 2 S [12], and VOCs (i.e., methanol, ethanol, propanol [13], and acetone [14]). The influence of effective surface area on the gas sensing properties of TiO 2 thin films is also frequently observed and investigated [15].…”

“…This synergetic system modifies the electronic structure by improving electron migration from titanium dioxide to tin dioxide and promotes oxygen molecule adsorption at the surface [34]. The as-formed heterojunction (n–n type) affects the response due to the formation of the accumulation/depletion layer and increases the potential barrier at the semiconductor/gas interface [7,35]. What is even more interesting is that titanium dioxide in the form of nanoflowers, both unmodified and sensitized by SnO 2 nanoparticles can exhibit different electrical properties under various gaseous conditions.…”

Nanocrystalline TiO2/SnO2 heterostructures for gas sensing

“…Our previous experience with this system [1,4,6–7 13] indicates that four classes of materials can be obtained:…”

Structural, textural, surface chemistry and sensing properties of mesoporous Pr, Zn modified SnO 2 –TiO 2 powder composites

“…oxides) is one way to obtain new materials with improved properties in comparison with their separate components. For example, in the last years there have been reported many papers related to the combination of ZnO, TiO 2 and SnO 2 [1,2] aiming to obtain materials with tailored structural, optical, electrical and sensoristic [2][3][4][5] or photocatalytic properties [1,6]. This is due to the high applicative potential of the metallic oxides in various fields as optics, electronics, or even biological domain [7].…”