Sensitive and selective ammonia gas sensor based on molecularly modified SnO₂

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

1 LGF-ENSMSE - Laboratoire Georges Friedel
2 SPIN-ENSMSE - Centre Sciences des Processus Industriels et Naturels
3 PTSI-ENSMSE - Département Procédés de Transformations des Solides et Instrumentation
4 LMGP - Laboratoire des matériaux et du génie physique

The development of selective and cheap metal oxide gas sensor at ambient temperature is still a challenging idea. In this study, SnO₂ surface functionalization was performed in order to obtain sensitive and selective gas sensor operated at ambient temperature. 3-aminopropyltriethoxysilane (APTES) was used as an intermediate step, followed by functionalization with molecules having acyl chloride with different end functional groups molecules such as alkyl, acid and ester groups. Acid and ester modified sensors are sensitive to ammonia between 0.2 and 10 ppm at room temperature. However, ester modified SnO₂ is more selective than acid modified sensor regarding ethanol and carbon monoxide gases.

Mots clés: SnO₂; molecular modification; APTES; gas sensor; sensitivity; selectivity; ambient temperature; ammonia

Domaines: Génie des procédés

Mohamad Hijazi, Valérie Stambouli, Mathilde Rieu, Guy Tournier, Christophe Pijolat, et al.. Sensitive and selective ammonia gas sensor based on molecularly modified SnO₂. EUROSENSORS 2017, CMC2; École des Mines de Saint-Étienne, Sep 2017, Paris, France. pp.399, ⟨10.3390/proceedings1040399⟩. ⟨hal-01597467⟩