Field emission from V2O5•nH2O nanorod Arrays

Hydrated vanadium pentoxide (V2O5 center dot nH(2)O) nanorod arrays with diameters of similar to 200 nm and lengths of more than 5 mu m have been synthesized via template-based physical wetting of V2O5 sols. The V2O5 center dot nH(2)O nanorod arrays were characterized by scanning electron microscopy, X-ray diffraction, and high-resolution transmission electron microscopy. Field-emission (FE) measurements on the V2O5 center dot nH(2)O nanorod arrays show low turn on voltages of 6-8 V/mu m and linear Fowler-Nordheim behaviors. The morphologies and natures of the V2O5 center dot nH(2)O samples are assumed to cause such good FE performances.