Substoichiometric hot-wire WOx films deposited in reducing environment

► Substoichiometric tungsten oxide films by heating W filaments in H2 (hwWOx x < 3). ► hwWOx films exhibit metallic optical and electrical properties. ► hwWOx films are amorphous and composed by particles with dimensions of 5 nm. ► hwWOx films crystallize easily above 420 K.