Hierarchical heteronanostructures of W nanothorns on WO3 nanowhiskers, as shown in the figure, was fabricated with a simple two-step thermal-evaporation process. A high density of W nanothorns form a heteronanostructure with thick WO3 nanowhiskers. A chemical transport–condensation model based on a vapor–solid mechanism is proposed for the formation of the W/WO3 hierarchical structures.
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Baek et al. (2006) studied this question.
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