Large-area, quasialigned nanotips of tungsten oxide have been grown by a two-step high-temperature, catalyst-free, physical evaporation deposition process. The tungsten oxide nanotips are single crystalline with growth direction of . The tungsten oxide nanotips exhibit excellent field-emission properties with a low threshold field (for an emission current density of 10 mA cm2) ∼4.37 MVm and uniform emission from the entire arrays, as well as high time stability. These results make tungsten oxide nanotip arrays a competitive candidate for field-emission displays.
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S. Z. Deng, NSX, and Jun Chen are thankful for the financial support of the project from the National Natural Science Foundation of China, the Ministry of Science and Technology of China, the Education Ministry of China, the Department of Education and Department of Science and Technology of Guangdong Province, and the Department of Science and Technology of Guangzhou City. Z. L. Wang is thankful for the support from the NSF, the NASA Vehicle Systems, the Department of Defense Research and Engineering (DDR&E), and the Defense Advanced Research Projects Agency (Award No. N66001-04-1-8903).
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