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    Towards fractional-order capacitors with broad tunable constant phase angles: Multi-walled carbon nanotube-polymer composite as a case study

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    Agambayev+et+al_2018_J._Phys._D__Appl._Phys._10.1088_1361-6463_aaa4de.pdf
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    Type
    Article
    Authors
    Agambayev, Agamyrat
    Rajab, Karam Hani
    Hassan, Ali H.
    Farhat, Mohamed
    Bagci, Hakan cc
    Salama, Khaled N. cc
    KAUST Department
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Electrical Engineering Program
    SABIC - Corporate Research and Innovation Center (CRI) at KAUST
    KAUST Grant Number
    RGC/3/2385-01
    Date
    2018-01-22
    Online Publication Date
    2018-01-22
    Print Publication Date
    2018-02-14
    Permanent link to this record
    http://hdl.handle.net/10754/626887
    
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    Abstract
    In this study, multi-walled carbon nanotube (MWCNT) filled Polyevinelidenefluoride-trifluoroethylene-chlorofluoroethylene (PVDF-TrFE-CFE) composites are used to realize fractional-order capacitors (FOCs). A solution-mixing and drop-casting approach is used to fabricate the composite. Due to the high aspect ratio of MWCNTs, percolation regime starts at a small weight percentage (wt%), 1.00 % .The distributed MWCNTs inside the polymer act as an electrical network of micro-capacitors and micro-resistors, which, in effect, behaves like a FOC. The resulting FOCs' constant phase angle (CPA) can be tuned from to by changing the wt% of the MWCNTs. This is the largest dynamic range reported so far at the frequency range from 150 kHz to 2 MHz for an FOC. Furthermore, the CPA and pseudo-capacitance are shown to be practically stable (with less than 1% variation) when the applied voltage is, changed between 500 µV and 5V. For a fixed value of CPA, the pseudo-capacitance can be tuned by changing the thickness of the composite, which can be done in a straightforward manner via the solution-mixing and drop-casting fabrication approach. Finally, it is shown that the frequency of a Hartley oscillator built using an FOC is almost 15 times higher than that of a Hartley oscillator built using a conventional capacitor.
    Citation
    Agambayev A, Rajab KH, Hassan AH, Farhat M, Bagci H, et al. (2018) Towards fractional-order capacitors with broad tunable constant phase angles: multi-walled carbon nanotube-polymer composite as a case study. Journal of Physics D: Applied Physics 51: 065602. Available: http://dx.doi.org/10.1088/1361-6463/aaa4de.
    Sponsors
    The authors would like to thank the King Abdullah University of Science and Technology (KAUST) and Saudi Basic Industries Corporation (SABIC) for funding this work under Grant No. RGC/3/2385-01.
    Publisher
    IOP Publishing
    Journal
    Journal of Physics D: Applied Physics
    DOI
    10.1088/1361-6463/aaa4de
    Additional Links
    http://iopscience.iop.org/article/10.1088/1361-6463/aaa4de
    ae974a485f413a2113503eed53cd6c53
    10.1088/1361-6463/aaa4de
    Scopus Count
    Collections
    Articles; Electrical and Computer Engineering Program; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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