| Summary: | Joule heating of niobium (Nb) metal wires by running a high electric current density through them has been used to grow Nb<sub>2</sub>O<sub>5</sub> nanowires. The formation of a micrometric oxide layer on the Nb wires has also been observed. The size and density of the nanowires are related to the current values applied, as well as the thickness of the oxide layer formed. Characterization of both nanowires and oxide layer has been performed using X-ray diffraction, scanning electron microscopy, energy dispersive X-ray microanalysis, and micro-Raman spectroscopy. It has been observed that this method allows the growth of Nb<sub>2</sub>O<sub>5</sub> nanowires in times as short as tens of seconds.
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