Synergistic Effect of Nanocrystalline SnO2 Sensitization by Bimetallic Au and Pd Modification via Ingle Step Flame Spray Pyrolysis Technique

Proceedings

Alina Krotova¹  Valeriy Krivetskiy¹  Konstantin Zamanskiy² 

[1] Department of Chemistry, M.V. Lomonosov Moscow State University, Leninskie Gory 1/3, Moscow 119234, Russia;Faculty of Materials Sciences, M.V. Lomonosov Moscow State University, Leninskie Gory 1/3, Moscow 119234, Russia;

关键词: metal oxide;    semiconductor;    gas sensor;    sensitization;    bimetal;    flame spray pyrolysis;   

DOI  :  10.3390/proceedings2019014046

来源: DOAJ

【 摘 要 】

Convenient and scalable single step flame spray pyrolysis (FSP) synthesis of bimetal AuPd sensitized nanocrystalline SnO₂ for gas sensor application is reported. The materials chemical composition, structure and morphology has been studied by XRD, XPS, HAADFSTEM, BET, ICP-MS techniques as well as thermo-programmed reduction with hydrogen (TPR-H₂). Superior gas sensor response of bimetal modified SnO₂ towards wide concentration range of reducing (CO, CH₄, C₃H₈, H₂S, NH₃) and oxidizing (NO₂) gases compared to pure and monometallic modified SnO₂ is reported. The observed enhanced gas sensor performance is concluded to arise from combination of facilitated oxygen molecule spillover on gold particles and electronic effect of Fermi level control by reoxidizing Pd-PdO clusters, homogeneously distributed over SnO₂ particles surface.

【 授权许可】

Unknown