A Novel Heteronanostructure System: Hierarchical W Nanothorn Arrays on WO3 Nanowhiskers


  • This work was supported by grant No. R01–2002-000-00279-0 (2002) from the Korea Science and Engineering Foundation, the Korean Research Foundation Grant funded by the Korean Government (MOEHRD) (KRF-2005-005-J13101), and grant No. RTI04-01-04 from the Regional Technology Innovation Program of the Ministry of Commerce, Industry and Energy (MOCIE).


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Hierarchical heteronanostructures of W nanothorns on WO3nanowhiskers, 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.