Fabrication of <1 1 0> oriented tungsten nano-tips by field-assisted water etching

Jo Onoda, Seigi Mizuno

    Research output: Contribution to journalArticle

    10 Citations (Scopus)

    Abstract

    We report the field-assisted H 2 O etching that enabled us to fabricate nano-tips from polycrystalline <1 1 0> oriented tungsten wires at room temperature. We optimized the sharpening procedure in order to obtain field emissions (FEs) with high collimation. The typical tip apex was composed of a large base and a nano-protrusion with a radius of curvature less than 3.5 . The narrowest opening angle (full width at half maximum) of the FE was 4.3° at 150 pA. We prepared two types of tips using two different applied bias voltages during the H 2 O etching. The electron microscope images and the analysis of Fowler-Nordheim (FN) plots revealed that the sizes of the individual bases depended on the fixed bias voltages during the H 2 O etching and affected their FE properties. In addition, we could confirm that the FE current from the nano-tip was more stable than that of the normal tip.

    Original languageEnglish
    Pages (from-to)8427-8432
    Number of pages6
    JournalApplied Surface Science
    Volume257
    Issue number20
    DOIs
    Publication statusPublished - Aug 1 2011

    All Science Journal Classification (ASJC) codes

    • Chemistry(all)
    • Condensed Matter Physics
    • Physics and Astronomy(all)
    • Surfaces and Interfaces
    • Surfaces, Coatings and Films

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