Abstract
In this study, we have developed an innovative processing technique to synthesize oxide microneedles with nanotips by in situ vapor deposition. Single-crystal needles of tungsten oxide W18O49, with their root diameter of ∼1μm and tip diameter of several nanometers, are successfully fabricated by this low-cost technique. Because of their sharp tips and excellent field emission property, the synthesized microneedles have the great potential to be used as tips for many micro- and nanodevices. Furthermore, this technique provides a basis to produce other oxide microneedles for functional and structural use.
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