, Volume 26, Issue 1-3, pp 483-488

New SnO2 Nano-Clusters Obtained by Sol-Gel Route, Structural Characterization and Their Gas Sensing Applications

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SnO2 is a well known and widely studied sensor material for the detection of CO and flammable gases like H2. Here we discuss the use of porous networks of SnO2 nanoparticles for an optical detection of the reducing gas CO. Nano-sized SnO2 clusters were prepared by the sol-gel method using an organically modified Sn precursor. After thermal treatment at 550°C the mean diameters of the primary SnO2 nanoparticles constructing the network were estimated to ∼25 nm and ∼15 nm, respectively, for particles obtained in acid and basic catalysis. The reversible redox behavior of SnO2 nano-clusters in reducing and oxidizing atmospheres (CO, O2) was studied optically by in-situ DR-UV/VIS spectroscopy.