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    Improvement of capacitive humidity sensors using tris(8-hydroxyquinoline) gallium (Gaq3) nanofibers as a dielectric layer

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    Date
    2020
    Author
    ur Rehman, Khalil
    Aziz, Fakhra
    Ahmad, Zubair
    Alamgir, Khalid
    Asif, Muhammad
    Tahir, Muhammad
    Sulaiman, Khaulah
    Bashir, Shahid
    Raza, Ehsan
    Muhammadsharif, Fahmi F.
    Bhadra, Jolly
    Al-Thani, Noora J.
    ...show more authors ...show less authors
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    Abstract
    In this research work, we improved the sensing response of the organic-based co-planar humidity sensors using tris(8-hydroxyquinoline) gallium (Gaq3) nanofibers as a dielectric material. The humidity sensor was fabricated by a drop-casting solution in the gap between pre-deposited silver (Ag) electrodes to form Ag/Gaq3/Ag-based capacitive-type humidity sensor. The morphology of the Gaq3 films has been investigated by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). At room temperature, the capacitive response of the sensor is evaluated in the range of 0 to 95%RH at 120 Hz & 1 kHz. Notably, at 1 kHz frequency, the sensor shows fast response, good sensitivity, and low hysteresis. The response & recovery times were found to be 6 s each, which are way smaller than those reported in the literature. Such features demonstrate that Gaq3 nanofibers are an up-and-coming candidate for making very sensitive and fast humidity sensors.
    DOI/handle
    http://dx.doi.org/10.1007/s10854-020-04683-y
    http://hdl.handle.net/10576/56560
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    • Center for Advanced Materials Research [‎1518‎ items ]
    • Research of Qatar University Young Scientists Center [‎213‎ items ]

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