Synthesis and field emission properties of large-area arrays of tungsten oxide pencil-like nanostructure

In this study, large-area W₁₈O₄₉ pencil-like nanostructure arrays can be grown on silicon substrate by multi-step thermal evaporation process is demonstrated. A side view scanning electron micrograph of a typical W₁₈O₄₉ pencil-like nanostructure arrays (a) and the enlarged SEM image (b) of a nanotip, as well as their typical SAEDS spectrum (c) and typical XRD spectrum (d) is shown. The samples of W₁₈O₄₉ pencil-like nanostructure arrays exhibit very good field emission characteristics. The array of low density has a better field emission characteristic and this indicates that lowering the density may decrease the field screening effect.