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Micron-sized tubes of tungsten oxide have been grown in a catalyst-free reaction by heating tungsten wires in a humid argon flow. They were systematically characterized with different kinds of surface analysis means. The tubes were 1–5μm in diameter and ∼10μm in length. Depending on the fabrication conditions, they were composed of either monoclinic W 18 O 49 or hexagonal tungsten...
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