P1.8.5 Cobalt Ferrite, a New Gas Sensing Material

Ch. Leroux, V. Madigou, M. Bendahan, N. Mliki & L. Ajroudi
The electrical response of cobalt ferrites CoxFe3-xO4 nanopowders with various cobalt amounts were tested in presence of reducing gases (NH3). The morphology, shape and chemical composition of the powders were fully characterized by transmission electron microscopy. For high cobalt amount, the response is typical of a p-type semi conductor, as for x=1, one observes n-type semi conductor response. For x=1.8, fast response and good reversibility was evidenced, with detection even at 10 ppm NH3, well...