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    Systematic exploration of electrospun polyvinylidene fluoride (PVDF)/multi-walled carbon nanotubes' (MWCNTs) composite nanofibres for humidity sensing application

    Year: 2021

    Journal: J. Taibah Univ. Sci., Volume 15, JAN 1, page 257–266

    Authors: Abutaleb, Ahmed; Hussain, Shahir; Imran, Mohd

    Organizations: Ministry of Education in Saudi Arabia [ISP20-23]

    Keywords: Electrospinning; MWCNTs; PVDF; nanofibres; humidity; sensors

    In this paper, the electrospinning technique was used to obtain multi-walled carbon nanotubes (MWCNTs) supported on electrospun polyvinylidene fluoride (PVDF) nanofibres (NFs) (PVDF/MWCNTs), a composite-based mat of NFs. The surface morphology of the PVDF/MWCNTs NFs was analysed by a field effect scanning electron microscope. The thickness of the NFs mat varies with the time and concentration of MWCNTs. The contact angle (CA) measurement shows that 2.5 wt% of MWCNTs in NF mat shows 61 degrees CA which suggests the hydrophilic nature of the prepared NF mat. Fourier transform infrared and Raman spectroscopy revealed the implantation of MWCNTs in PVDF matrix and side wall attachment with polymer chain. X-ray diffraction and FTIR studies show that as the MWCNT content increases, the alpha-phase in PVDF decreases, indicating that MWCNT has a strong effect on phase transformation. Consequently, the NFs show an almost linear capacitive response. They showed that the high-capacitive changes in PVDF/MWCNTs' NFs are achieved at 2.5 wt% MWCNTs' addition at different humidity levels. The sensitivity of the PVDF/MWCNTs' (2.5 wt%) NF mat-based capacitive sensor exhibits high sensitivity similar to 0.71 pF/%RH. Hence, PVDF/MWCNTs' NFs perform attention-grabbing properties for the humidity sensing application.
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