A single ZnO tetrapod-based sensor

    Authors

    O. Lupan; L. Chow;G. Y. Chai

    Comments

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    Abbreviated Journal Title

    Sens. Actuator B-Chem.

    Keywords

    Fabrication; ZnO nancrod; ZnO tetrapod; UV sensor; Gas sensor; Zinc; oxide; FIELD-EFFECT TRANSISTORS; ZINC-OXIDE; NANOWIRES; FABRICATION; NANOBELTS; NANOTUBES; TRANSPORT; NANORODS; GROWTH; Chemistry, Analytical; Electrochemistry; Instruments & Instrumentation

    Abstract

    Transferable ZnO tetrapods were grown by an aqueous solution method. An individual ZnO tetrapod-based sensor was fabricated by in situ lift-out technique and its ultraviolet (UV) and gas sensing properties were investigated. This single tetrapod-based device responds to the UV light rapidly and showed a recovery time of about 23 s. The sensitivity of a single ZnO tetrapod sensor to oxygen concentration was also investigated. We found that when UV illumination is switched off, the oxygen chemisorption process will dominate and assists photoconductivity relaxation. Thus relaxation dynamics is strongly affected by the ambient 02 partial pressure as described. We also studied the response of ZnO tetrapod-based sensor in various gas environments, such as 100 ppm H(2), CO, i-butane, CH(4), CO(2), and SO(2) at room temperature. It is noted that ZnO tetrapod sensor is much more sensitive to H(2), i-butane and CO. It is demonstrated that a ZnO tetrapod exposed to both UV light and hydrogen can provide a unique integrated multiterminal architecture for novel electronic device configurations. (C) 2009 Elsevier B.V. All rights reserved.

    Journal Title

    Sensors and Actuators B-Chemical

    Volume

    141

    Issue/Number

    2

    Publication Date

    1-1-2009

    Document Type

    Article

    Language

    English

    First Page

    511

    Last Page

    517

    WOS Identifier

    WOS:000270343000025

    ISSN

    0925-4005

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