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The Role of Hierarchical Morphologies in the Superior Gas Sensing Performance of CuO-Based Chemiresistors

Authors

  • Diogo P. Volanti,

    1. Departamento de Físico-Química, Instituto de Química, Universidade Estadual Paulista (UNESP), Araraquara, SP, 14800-900, Brazil
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  • Anderson A. Felix,

    Corresponding author
    1. Departamento de Físico-Química, Instituto de Química, Universidade Estadual Paulista (UNESP), Araraquara, SP, 14800-900, Brazil
    2. Department of Materials Science and Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA, 02139, USA
    • Departamento de Físico-Química, Instituto de Química, Universidade Estadual Paulista (UNESP), Araraquara, SP, 14800-900, Brazil
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  • Marcelo O. Orlandi,

    1. Departamento de Físico-Química, Instituto de Química, Universidade Estadual Paulista (UNESP), Araraquara, SP, 14800-900, Brazil
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  • George Whitfield,

    1. Department of Materials Science and Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA, 02139, USA
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  • Dae-Jin Yang,

    1. Department of Materials Science and Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA, 02139, USA
    Current affiliation:
    1. Materials Research Laboratory, Samsung Advanced Institute of Technology, Samsung Electronics Corporation, Yongin-Si, Gyeonggi-Do 446-712, Republic of Korea
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  • Elson Longo,

    1. Departamento de Físico-Química, Instituto de Química, Universidade Estadual Paulista (UNESP), Araraquara, SP, 14800-900, Brazil
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  • Harry L. Tuller,

    Corresponding author
    1. Department of Materials Science and Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA, 02139, USA
    • Department of Materials Science and Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA, 02139, USA.
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  • José A. Varela

    1. Departamento de Físico-Química, Instituto de Química, Universidade Estadual Paulista (UNESP), Araraquara, SP, 14800-900, Brazil
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Abstract

The development of gas sensors with innovative designs and advanced functional materials has attracted considerable scientific interest given their potential for addressing important technological challenges. This work presents new insight towards the development of high-performance p-type semiconductor gas sensors. Gas sensor test devices, based on copper (II) oxide (CuO) with innovative and unique designs (urchin-like, fiber-like, and nanorods), are prepared by a microwave-assisted synthesis method. The crystalline composition, surface area, porosity, and morphological characteristics are studied by X-ray powder diffraction, nitrogen adsorption isotherms, field-emission scanning electron microscopy and high-resolution transmission electron microscopy. Gas sensor measurements, performed simultaneously on multiple samples, show that morphology can have a substantial influence on gas sensor performance. An assembly of urchin-like structures is found to be most effective for hydrogen detection in the range of parts-per-million at 200 °C with 300-fold larger response than the previously best reported values for semiconducting CuO hydrogen gas sensors. These results show that morphology plays an important role in the gas sensing performance of CuO and can be effectively applied in the further development of gas sensors based on p-type semiconductors.

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