Integration of individual TiO2 nanotube on the chip: Nanodevice for hydrogen sensing

    Authors

    M. Enachi; O. Lupan; T. Braniste; A. Sarua; L. Chow; Y. K. Mishra; D. Gedamu; R. Adelung;I. Tiginyanu

    Comments

    Authors: contact us about adding a copy of your work at STARS@ucf.edu

    Abbreviated Journal Title

    Phys. Status Solidi-Rapid Res. Lett.

    Keywords

    TiO2; nanotubes; hydrogen; gas sensors; anatase; rutile; GAS SENSORS; TEMPERATURE; ANATASE; ANODIZATION; ARRAYS; FILMS; Materials Science, Multidisciplinary; Physics, Applied; Physics, ; Condensed Matter

    Abstract

    Titania (TiO2) exists in several phases possessing different physical properties. In view of this fact, we report on three types of hydrogen sensors based on individual TiO2 nanotubes (NTs) with three different structures consisting of amorphous, anatase or anatase/rutile mixed phases. Different phases of the NTs were produced by controlling the temperature of post-anodization thermal treatment. Integration of individual TiO2 nanotubes on the chip was performed by employing metal deposition function in the focused ion beam (FIB/SEM) instrument. Gas response was studied for devices made from an as-grown individual nanotube with an amorphous structure, as well as from thermally annealed individual nanotubes exhibiting anatase crystalline phase or anatase/rutile heterogeneous structure. Based on electrical measurements using two Pt complex contacts deposited on a single TiO2 nanotube, we show that an individual NT with an anatase/rutile crystal structure annealed at 650 degrees C has a higher gas response to hydrogen at room temperature than samples annealed at 450 degrees C and as-grown. The obtained results demonstrate that the structural properties of the TiO2 NTs make them a viable new gas sensing nanomaterial at room temperature. (C) 2015 WILEY-VCH Verlag GmbH &Co. KGaA, Weinheim

    Journal Title

    Physica Status Solidi-Rapid Research Letters

    Volume

    9

    Issue/Number

    3

    Publication Date

    1-1-2015

    Document Type

    Article

    Language

    English

    First Page

    171

    Last Page

    174

    WOS Identifier

    WOS:000351674600004

    ISSN

    1862-6254

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