Abstract
Abstract We report the co-deposition, in a single step, of metal nanoparticles and tungsten oxide nanoneedles by aerosol assisted chemical vapor deposition. The method leads to the growth of tungsten oxide nanoneedles decorated with copper, gold or platinum metal nanoparticles, respectively. SEM, TEM and EDX analysis have been used to investigate the morphology and composition of the different nanostructures grown on Al2O3 substrates. Gas sensors employing the different nanostructures have been fabricated and a preliminary characterization of their sensing properties to carbon monoxide and hydrogen is shown. Our nanomaterials behave as n-type semiconductors and, those decorated with metal nanoparticles show high stability, high reproducibility, high response and rapid detection of the gases studied at moderate operating temperatures (i.e., 250 or 300 °C).
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