A low voltage gas ionization sensor based on sparse gold nanorods

Ramin Banan Sadeghian, Mojtaba Kahrizi

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    13 Citations (Scopus)

    Abstract

    We report fabrication and characterization of a gas ionization sensor using a sparse array of vertically aligned gold nanorods (AuNR). Our device displayed improved sensitivity compared to the carbon nanotube (CNT) film counterpart, since the room temperature breakdown voltages (Vb) of the tested gases were further reduced. With AuNRs configured as the cathode, Vb was unaffected by gas pressure within a wide range (10-5 < P < 0.1 torr), suggesting that the breakdown process does not follow Townsend's criterion. At higher and lower pressures, Vb increased. The field-emission (FE) and field-ionization (FI) properties of the AuNRs were also studied, and the latter showed measurable pressure dependency in a certain voltage range. The lowering of Vb as well as enhanced FE and FI actions, were attributed to the high field-amplification factor of atomically sharp features on AuNR tips covered by a thin alumina scale.

    Original languageEnglish
    Title of host publicationThe 6th IEEE Conference on SENSORS, IEEE SENSORS 2007
    Pages648-651
    Number of pages4
    DOIs
    Publication statusPublished - 2007 Dec 1
    Event6th IEEE Conference on SENSORS, IEEE SENSORS 2007 - Atlanta, GA, United States
    Duration: 2007 Oct 282007 Oct 31

    Publication series

    NameProceedings of IEEE Sensors

    Other

    Other6th IEEE Conference on SENSORS, IEEE SENSORS 2007
    CountryUnited States
    CityAtlanta, GA
    Period07/10/2807/10/31

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering

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