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dc.contributor.authorZhu, Xiaoxien
dc.contributor.authorNg, Leonard WTen
dc.contributor.authorHu, Guohuaen
dc.contributor.authorWu, Tien-Chunen
dc.contributor.authorUm, Doo-Seungen
dc.contributor.authorMacadam, Nasiruddinen
dc.contributor.authorHasan, Tawfiqueen
dc.date.accessioned2020-04-16T23:30:46Z
dc.date.available2020-04-16T23:30:46Z
dc.date.issued2020-08en
dc.identifier.issn1616-301X
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/304446
dc.description.abstractSolution-processable thin-film dielectrics represent an important material family for large-area fully-printed electronics. Yet, in recent years, it has seen only limited development, and has mostly remained confined to pure polymers. Although it is possible to achieve excellent printability, these polymers have low (∼2-5) dielectric constants (εr). There have been recent attempts to use solution-processed two-dimensional (2D) hexagonal boron nitride (h-BN) as an alternative. However, the deposited h-BN flakes create porous thin-films, compromising their mechanical integrity, substrate adhesion and susceptibility to moisture. We address these challenges by developing a ‘one-pot’ formulation of polyurethane (PU)-based inks with h-BN nano-fillers. Our approach enables coating of pinhole-free, flexible PU+h-BN dielectric thin- films. We optimise the h-BN dispersion concentration with respect to exfoliation yield, optical transparency and thin-film uniformity. We achieve a maximum εr∼7.57, a two-fold increase over pure PU, with only 0.7 vol% h-BN in the dielectric thin-film. A high optical transparency of ∼78.0% (∼0.65% variation) is measured across a 25 cm2 area for a μm thick dielectric. The dielectric property of the composite is also consistent, with a measured areal capacitance variation of < 8% across 64 printed capacitors. Our formulation represents an optically transparent, flexible thin-film, with enhanced dielectric constant for printed electronics.
dc.description.sponsorshipEPSRC funding acknowledged (EP/L016087/1)
dc.format.mediumPrint-Electronicen
dc.languageengen
dc.publisherWiley-Blackwell
dc.rightsAll rights reserved
dc.titleHexagonal Boron Nitride-Enhanced Optically Transparent Polymer Dielectric Inks for Printable Electronics.en
dc.typeArticle
prism.issueIdentifier31en
prism.publicationDate2020en
prism.publicationNameAdvanced functional materialsen
prism.startingPage2002339
prism.volume30en
dc.identifier.doi10.17863/CAM.51526
dcterms.dateAccepted2020-04-15en
rioxxterms.versionofrecord10.1002/adfm.202002339en
rioxxterms.versionAM
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2020-08en
dc.contributor.orcidHu, Guohua [0000-0001-9296-1236]
dc.contributor.orcidWu, Tien-Chun [0000-0002-6185-3256]
dc.contributor.orcidHasan, Tawfique [0000-0002-6250-7582]
dc.identifier.eissn1616-3028
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idEPSRC (EP/L016087/1)
cam.orpheus.successTue Jun 16 10:39:25 BST 2020 - Embargo updated*
cam.orpheus.counter8*
rioxxterms.freetoread.startdate2023-04-16


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