Enhanced field ionization/desorption on branched silicon nanowires: Applications in gas ionization detection

R. Banan-Sadeghian, M. Saif Islam

    研究成果: Conference contribution

    1 被引用数 (Scopus)

    抄録

    We demonstrate anomalous gaseous field ionization and field desorption on branching intrinsic silicon nanowires grown by a two-step VLS technique. Field ionization and desorption I-V curves of argon, nitrogen, helium, and ammonia, were recorded individually within a wide pressure range (10-7 to 10 Torr). Field ionization initiated at sub volt was followed by field desorption at about 7 - 38 V (applied field of ∼ 7×102 to 3.8×103 V/cm). Such voltages are three orders of magnitude smaller than the applied voltages required to generate field ionization on sharp metallic tips having the same tip curvature. The measured I-V curves were pressure dependent. Low voltage filed ionization and desorption phenomena were attributed to the combination effects of geometrical field enhancement on the apex of nanoscale silicon branches, field penetration, increased tunneling critical distance, band gap widening due to quantum confinement, and the surface states formed by the catalyst. The results presented herein suggest that gold terminated branching silicon nanowires could be strong candidates in building low power gas ionization sensors useful in highly selective detection of gases with low adsorption energies.

    本文言語English
    ホスト出版物のタイトルMicro- and Nanotechnology Sensors, Systems, and Applications II
    DOI
    出版ステータスPublished - 2010 12 1
    イベントMicro- and Nanotechnology Sensors, Systems, and Applications II - Orlando, FL, United States
    継続期間: 2010 4 52010 4 9

    出版物シリーズ

    名前Proceedings of SPIE - The International Society for Optical Engineering
    7679
    ISSN(印刷版)0277-786X

    Other

    OtherMicro- and Nanotechnology Sensors, Systems, and Applications II
    国/地域United States
    CityOrlando, FL
    Period10/4/510/4/9

    ASJC Scopus subject areas

    • 電子材料、光学材料、および磁性材料
    • 凝縮系物理学
    • コンピュータ サイエンスの応用
    • 応用数学
    • 電子工学および電気工学

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