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Browsing MS/MPhil by Author "Bushra Naveed"

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    Experimental study of graphene oxide−TPPNi nanocomposite based thin film for humidity sensing application
    (UMT, Lahore, 2021) Bushra Naveed
    Herein this study, we provide improved sensing characteristics, of 5,10,15,20-tetra Phenyl Porphyrinato Nickel (II) (TPPNi) based control humidity sensor. The current experimental study demonstrates that combining TPPNi with graphene oxide (GO) nano-sheets considerably enhances its humidity sensing capability. TPPNi has been synthesized via low temperature & green microwave-assisted synthesis process, whereas, GO has been prepared from graphite powder utilizing Hummer’s method. The structural examination of GO has been performed via FTIR analysis, indicating the successful oxidation of graphite by the presence of oxygenated functional groups. The FESEM surface topographical analysis signifies that GO nanosheets are uniformly distributed and well-attached on TPPNi micropyramidal structures; thereby serving as nanofillers providing a large amount of adsorption/anchoring sites for relative humidity (%RH). The humidity sensing device has been fabricated in a surface-type geometry (Al/TPPNi-GO/Al) and has been electrically characterized at four discrete test frequencies of the AC applied voltage (Vrms ~ 1V): 500 Hz, 1, 10 and 100 kHz. The proposed TPPNi-GO nanocomposite-based device has a capacitive sensitivity of 243.57 pF / %RH @ 500 Hz, which is about 1.67 times higher in comparison with the control TPPNi-based device. The capacitive sensor also has a shorter response time (18 s) and faster recovery time (8 s), accompanied by a wider dynamic range (40 94% RH), as compared to the control device. It is theorized that the superior sensing performance may be linked to the effective diffusion kinetics of water vapours owing to the synergistic enhancement in surface morphology (on the nanoscale), realized by TPPNi-GO nanocomposite.