Selectivity of Catalytically Modified Tin Dioxide to CO and NH3 Gas Mixtures

Chemosensors

Artem Marikutsa¹  Marina Rumyantseva²  Alexander Gaskov² 

[1] Chemistry Department, Moscow State University, Vorobyevy gory 1-3, Moscow 119991, Russia;

关键词: gas mixture analysis;    selectivity;    gas sensors;    nanocrystalline tin dioxide;    surface modification;    carbon monoxide;    ammonia;   

DOI  :  10.3390/chemosensors3040241

来源: mdpi

【 摘 要 】

This paper is aimed at selectivity investigation of gas sensors, based on chemically modified nanocrystalline tin dioxide in the detection of CO and ammonia mixtures in air. Sol-gel prepared tin dioxide was modified by palladium and ruthenium oxides clusters via an impregnation technique. Sensing behavior to CO, NH₃ and their mixtures in air was studied by in situ resistance measurements. Using the appropriate match of operating temperatures, it was shown that the reducing gases mixed in a ppm-level with air could be discriminated by the noble metal oxide-modified SnO₂. Introducing palladium oxide provided high CO-sensitivity at 25–50 °C. Tin dioxide modified by ruthenium oxide demonstrated increased sensor signals to ammonia at 150–200 °C, and selectivity to NH₃ in presence of higher CO concentrations.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.