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dc.contributor.advisorBagci, Hakan
dc.contributor.authorAgambayev, Agamyrat
dc.date.accessioned2019-02-28T11:47:48Z
dc.date.available2020-02-29T00:00:00Z
dc.date.issued2019-02
dc.identifier.citationAgambayev, A. (2019). Design, fabrication and application of fractional-order capacitors. KAUST Research Repository. https://doi.org/10.25781/KAUST-TX484
dc.identifier.doi10.25781/KAUST-TX484
dc.identifier.urihttp://hdl.handle.net/10754/631276
dc.description.abstractThe fractional–order capacitors add an additional degree of freedom over conventional capacitors in circuit design and facilitate circuit configurations that would be impractical or impossible to implement with conventional capacitors. We propose a generic strategy for fractional-order capacitor fabrication that integrates layers of conductive, semiconductor and ferroelectric polymer materials to create a composite with significantly improved constant phase angle, constant phase zone, and phase angle variation performance. Our approach involves a combination of dissolving the polymer powders, mixing distinct phases and making a film and capacitor of it. The resulting stack consisting of ferroelectric polymer-based composites shows constant phase angle over a broad range of frequencies. To prove the viability of this method, we have successfully fabricated fractional-order capacitors with the following: nanoparticles such as multiwall carbon nanotube (MWCNT), Molybdenum sulfide (MoS2) inserted ferroelectric polymers and PVDF based ferroelectric polymer blends. They show better performance in terms of fabrication cost and dynamic range of constant phase angle compared to fractional order capacitor from graphene percolated polymer composites. These results can be explained by a universal percolation model, where the combination of electron transport in fillers and the dielectric relaxation time distribution of the permanent dipoles of ferroelectric polymers increase the constant phase angle level and constant phase zone of fractional-order capacitors. This approach opens up a new avenue in fabricating fractional capacitors involving a variety of heterostructures combining the different fillers and different matrixes.
dc.language.isoen
dc.subjectFractional-order Capacity
dc.subjectNanocomposite
dc.subjectConstant phase element
dc.subjectBilayer Polymer
dc.subjectPVDF
dc.titleDesign, fabrication and application of fractional-order capacitors
dc.typeDissertation
dc.contributor.departmentComputer, Electrical and Mathematical Science and Engineering (CEMSE) Division
dc.rights.embargodate2020-02-29
thesis.degree.grantorKing Abdullah University of Science and Technology
dc.contributor.committeememberSalama, Khaled N.
dc.contributor.committeememberBaran, Derya
dc.contributor.committeememberBiswas,Karabi
thesis.degree.disciplineElectrical Engineering
thesis.degree.nameDoctor of Philosophy
dc.rights.accessrightsAt the time of archiving, the student author of this dissertation opted to temporarily restrict access to it. The full text of this dissertation became available to the public after the expiration of the embargo on 2020-02-29.
refterms.dateFOA2020-02-29T00:00:00Z
kaust.request.doiyes


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