Efficiency of new ozone filters for NO$_2$ sensing and air depollution

M. Othman (1) , C. Théron (2) , Marc Bendahan (1) , L. Caillat (2) , C. Rivron (2) , S. Bernardini (1) , G. Le Chevallier (2) , E. Chevallier (3) , M.-P. Som (3) , Khalifa Aguir (1) , T.-H. Tran-Thi (2)

1 IM2NP - Institut des Matériaux, de Microélectronique et des Nanosciences de Provence
2 LEDNA - Laboratoire Edifices Nanométriques
3 ETHERA

Specific filters can be used up-stream with metal oxide (MOX) gas sensors to trap ozone and allow the selective detection of NO2. These filtering media are based on nanoporous matrices doped with indigo-carmine that reacts selectively with O$_3$. The nanoporous materials, produced via the sol-gel process using functionalized silicon alkoxides as precursors, are tailored for the trapping of O$_3$. Depending on the nature of the filter, it is possible to entirely trap O$_3$ and allow NO$_2$ to partially pass over a certain range of concentration. For air depollution purpose, selected filters that efficiently trap both O$_3$ and NO$_2$ were exposed to harsh conditions under high concentrations of O$_3$ (350–475 ppb) and humidity (RH: 72%, T = 21 °C). Their trapping efficiency and lifetime are determined and compared with those of activated carbon.

Domaines: Matériaux

M. Othman, C. Théron, Marc Bendahan, L. Caillat, C. Rivron, et al.. Efficiency of new ozone filters for NO$_2$ sensing and air depollution. Sensors and Actuators B: Chemical, 2018, 265, pp.591-599. ⟨10.1016/j.snb.2018.03.019⟩. ⟨cea-01730619⟩