Selective Ammonia Gas Sensor based on SnO₂-APTES Modification

Mohamad Hijazi (1, 2, 3) , Mathilde Rieu (1, 2, 3) , Valérie Stambouli (4) , Guy Tournier (1, 2, 3) , Jean-Paul Viricelle (1, 2, 3) , Christophe Pijolat (1, 2, 3)

1 LGF-ENSMSE - Laboratoire Georges Friedel
2 SPIN-ENSMSE - Centre Sciences des Processus Industriels et Naturels
3 PRESSIC-ENSMSE - Procédés et REactivité des Systèmes Solide-gaz, Instrumentation et Capteurs
4 LMGP - Laboratoire des matériaux et du génie physique

In the present work, SnO₂ sensors were produced by thick film fabrication. In order to deal with well-known lack of selectivity of SnO₂ sensors, functionalization was performed. Silanization by 3-aminopropyltriethoxysilane (APTES) in liquid phase was used as an intermediate step, followed by functionalization with molecules bearing acyl chloride with different end functional groups molecules, for example ester group. Modified sensors with APTES and ester end functional group were successfully characterized by attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR). The SnO₂ sensor modified with ester end group was found to be sensitive and selective to ammonia gas at 100°C. Working at low temperature is also one of the advantages of these sensors as well as the selectivity with respect to other gases like acetone.

Mots clés: selectivity; NH₃; acetone; gas sensors; APTES; surface functionalization; SnO₂

Domaines: Chimie analytique; Génie des procédés

Mohamad Hijazi, Mathilde Rieu, Valérie Stambouli, Guy Tournier, Jean-Paul Viricelle, et al.. Selective Ammonia Gas Sensor based on SnO₂-APTES Modification. 30th anniversary Eurosensors Conference (EUROSENSORS 2016), Hungarian Academy of Sciences; Akadémiai Kiadó / AKCongress, Sep 2016, Budapest, Hungary. pp.280-283, ⟨10.1016/j.proeng.2016.11.193⟩. ⟨hal-01436032⟩