Fe 2 O 3 :SnO 2 Nanostructured System as Semiconductor Gas Sensor Material

In the present work, we report a detailed study based on transmission electron microscopy of the microstructure and composition of the Fe 2 O 3 : SnO 2 nanometrical binary system obtained by sol-gel. We studied a set of samples based in a pure Fe 2 O 3 material where we added SnO 2 from 0 to 50% Sn-Fe nominal content. The structure of our composites will change from pure a-Fe2O 3 to the well-known cassiterite SnO 2 structure for high Sn content. Distortions on the structural parameters will be attributed to the presence Sn 4+ ions on the α-Fe 2 O 3 structure and Fe 3+ ions on the SnO 2 cassiterite structure.