Catalytically Active Filters Deposited by SILD Method for Inhibiting Sensitivity to Ozone of SnO₂-Based Conductometric Gas Sensors

Abstract

Research has shown that successive ionic layer deposition (SILD) technology can be used for improvement operating characteristics of solid state conductometric gas sensors. This technology gives possibility to deposit nanolayers of noble metals such as Pd, Ag, SnO 2 -Au nanocomposites, and oxides of transition metals such as Cu, Fe, Mn, Co, which can play the role of catalytically active filters for ozone.

Ozone Sensing by In2O3 Films Modified with Rh: Dimension Effect

“…On the other hand, at a larger degree of coverage it behaves as a poisoner or a catalytically active filter that prevents the interaction of ozone with In 2 O 3 . Previously, we observed this effect after surface modification of the SnO 2 surface with silver and palladium [ 44 ]. The effect of surface modification with rhodium on the gas-sensing characteristics of In 2 O 3 films depends on the initial properties of the film used.…”

“…On the other hand, at a larger degree of coverage it behaves as a poisoner or a catalytically active filter that prevents the interaction of ozone with In 2 O 3 . Previously, we observed this effect after surface modification of the SnO 2 surface with silver and palladium [ 44 ].…”

Selectivity in trace gas sensing: recent developments, challenges, and future perspectives

“…334–337 (iii) Target specific physical properties : The selectivity can be improved by exploiting the catalyst interactions, 338–340 surface acidity and basicity, 141,341,342 removal of conversion products 343–345 and higher sensitivity of target analyte by a specific filter. 346–348 (iv) Filter configuration : Catalytic filters are fabricated as overlayer configurations on the top of sensing materials so that the sensor efficiency (delayed response) is somehow conceded. An additional inert layer of Al 2 O 3 or SiO 2 may solve the problem.…”

Efficiency of new ozone filters for NO2 sensing and air depollution

“…A filter based on AC (Maxsorb) to selectively destroy ozone rather than nitrogen dioxide via a precise control of the temperature, was suggested by Berry et al [19]. Other materials combining AC with oxide materials, noble-metal-supported catalysts, and various transition-metal oxides showed an enhanced ability of O 3 decomposition [20][21][22]. Ferrihydrite (2LFh) with accessible mesopores was also used by Mathew et al who found 2LFh to be the most efficient candidate for O 3 removal as compared to other materials such as ␥Fe 2 O 3 , Fe/ZSM-5 or commercial manganese dioxide (MnO 2 ) [23].…”