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    Wafer-scale few-layer graphene growth on Cu/Ni films for gas sensing applications

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    1-s2.0-S0925400519316570-main.pdf
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    2.348Mb
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    PDF
    Description:
    Accepted manuscript
    Embargo End Date:
    2021-11-27
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    Type
    Article
    Authors
    Deokar, Geetanjali cc
    Casanova-Cháfer, Juan cc
    Rajput, Nitul S.
    Aubry, Cyril
    Llobet, Eduard cc
    Jouiad, Mustapha
    Da Costa, Pedro M. F. J. cc
    KAUST Department
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    KAUST Grant Number
    BAS/1/1346-01-01
    Date
    2019-11-27
    Online Publication Date
    2019-11-27
    Print Publication Date
    2020-02
    Embargo End Date
    2021-11-27
    Permanent link to this record
    http://hdl.handle.net/10754/660592
    
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    Abstract
    Pristine, few-layer graphene (FLG)/Si nanopillar assemblies are introduced as gas sensitive chemiresistors showing unprecedented sensitivity towards NO2 when operated at room temperature (25 °C) and in humid air. To achieve this, we first developed wafer-scale (∼50 cm2) FLG growth using sub-micrometer thick films of thermally evaporated Cu/Ni on a SiO2/Si substrate. The Ni film was deposited and annealed to induce the formation of a Cu-rich binary alloy. This alloy formation limited the inter-diffusion of Cu and SiO2, a phenomenon known to take place during the CVD growth of graphene on Cu/SiO2/Si. The as-grown high structural quality FLG was transferred, using a conventional wet chemical method, to lithographically patterned arrays of Si nanopillars (non-flat substrate). Testing of the FLG/Si assembly revealed a NO2 sensitivity that outperforms what is reported in the literature for pristine graphene. Overall, our growth and device fabrication work-flow demonstrate a way to design graphene-based gas sensing systems without incurring inconvenient processing steps such as metal foil etching, surface functionalization or particle loading.
    Citation
    Deokar, G., Casanova-Cháfer, J., Rajput, N. S., Aubry, C., Llobet, E., Jouiad, M., & Costa, P. M. F. J. (2020). Wafer-scale few-layer graphene growth on Cu/Ni films for gas sensing applications. Sensors and Actuators B: Chemical, 305, 127458. doi:10.1016/j.snb.2019.127458
    Sponsors
    This work was funded by the Masdar Institute (contract EX2016-000026) and KAUST (BAS/1/1346-01-01). We are thankful to Dr. Sozaraj Rasappa (Tampere University, Finland) for the patterned Si nanopillar substrate. GD is thankful to Leslie George (Khalifa University, Abu Dhabi) for technical support. E.L. is supported by the Catalan Institution for research and Advanced Studies via the 2018 ICREA Academia Award, by MINECO and FEDER under grant no. TEC2015- 71663R and by AGAUR under grant no. 2017 SGR 418.
    Publisher
    Elsevier BV
    Journal
    Sensors and Actuators, B: Chemical
    DOI
    10.1016/j.snb.2019.127458
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S0925400519316570
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.snb.2019.127458
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program

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