A novel miniature gas ionization sensor based on freestanding gold nanowires

Ramin Banan Sadeghian, Mojtaba Kahrizi

    研究成果: Article査読

    72 被引用数 (Scopus)

    抄録

    Freestanding gold nanowires (AuNW) were incorporated to fabricate a miniaturized gas ionization sensor. The device exhibited improved sensitivity in sub-Torr pressure (P) regime compared to similar devices reported earlier, since the room temperature breakdown voltage (Vb) was further reduced in low gas pressures or concentrations (N). Also excellent selectivity was achieved for pressures up to 10 Torr, while Vb remained almost unaffected by pressure. In the Vb-P characteristic below 1 Torr, Vb was less when the AuNWs was configured as cathode, and it started to decline until a Paschen-like (Vb)min was observed at very low pressures (0.3 < P < 0.5 Torr). The reduction of breakdown voltage in this case, was attributed to the creation of an abnormally large amount of secondary electrons at the nanowire tips due to the increase in Townsend's secondary ionization factor (ω/α) at very high reduced fields (E/N). The pre-breakdown I-V characteristic of the device, obtained at extreme low pressures showed polarity dependency. The field enhancement factor (β) of the AuNW array was estimated by operating the device in the ohmic discharge region. The average aspect-ratio of the nanowires, which was extracted from the I-V characteristic, showed good agreement with SEM observations.

    本文言語English
    ページ(範囲)248-255
    ページ数8
    ジャーナルSensors and Actuators, A: Physical
    137
    2
    DOI
    出版ステータスPublished - 2007 7月 4

    ASJC Scopus subject areas

    • 電子材料、光学材料、および磁性材料
    • 器械工学
    • 凝縮系物理学
    • 表面、皮膜および薄膜
    • 金属および合金
    • 電子工学および電気工学

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