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Abstract
The orthorhombic LaFeO3thin films grown by pulsed laser deposition on silicon showed nano-structuration of their surface and preferential crystallographic exposed facets, depending on the deposition temperature. The LaFeO3film deposited at 850 °C has two types of grain termination, flat or tip-like, corresponding to two different growth directions, respectively [110] and [200]. However, due to the shape of the termination, the two types of grains expose the same {110} facets. The prepared lanthanum iron oxide films are iron deficient and consequently contains oxygen vacancies, the exact chemical formula being LaFe0.82O3-δ.
Highlights
Air quality has grown to be a major health issue
While there is no particular shape for the regions with grains bunches, the flat regions are usually elongated with a form factor of 0.7 and 0.6 respectively for LaFeO3-750 and of contrast pointing to a significant surface roughness (Figs. 1c and 1g)
Low magnification images indicate a certain long-distance structuring that could be a residual ordering of the nanostructures observed at lower temperatures, though this fact should be confirmed by further analyses
Summary
Air quality has grown to be a major health issue. actions, through legislations, have been taken to limit the pollutants present in the air, such as CO, NOx, SO2, etc. The tendency seems to be the insertion of always more sensitive gas sensors to monitor the level of pollutants at any moment and anywhere This is true for the car industry that have to innovate in a search of cost-effective sensors with high sensitivity, high accuracy and resistant to the heat and the chemical compounds found in the exhaust system. Because they are chemically stable with temperature, perovskite oxides with general stoichiometry ABO3 (A and B being cations of different valences and sizes) are good candidates for that purpose. It is believed that this large ionic radius will have for consequence to lower the B-O bond strength and, in return, helps the catalytic process [11]
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