Broadband luminescent ferroelectric biocompatible Er:(Na,K)NbO3 nanofibers
2016 (English)In: Journal of The American Ceramic Society, ISSN 0002-7820, E-ISSN 1551-2916Article in journal (Refereed) Published
Dense homogeneous fabric composed from continuous bead-free erbium-doped sodium potassium niobate (Er:NKN) 100 lm long and 100-200 nm in diameter nanofibers was sintered by sol-gel calcination assisted electrospinning technique. X-ray diffraction revealed preferential cube-on-cube -directional growth of fibers containing predominantly monoclinic Na0.35K0.65NbO3-type phase and significantly less of tetragonal NbO2, cubic Er2O3, and monoclinic ErNbO4 phases. Er doping with the concentration of 2 at.% provides readily detectable room-temperature broad-band photoluminescence (PL) centered at kPL = 0.55 and 0.98 lm being pumped, respectively, with 532 and 785 nm lasers. Impedance spectroscopy and static electrical tests revealed ferroelectric properties, electric field induced resistance switching and strong rectification effect in nanoporous sandwich Au/Er: NKN/Pt capacitive cell. Memristor-type current-voltage (I-V) characteristics originate from the electrochemical migration of oxygen vacancies at the n-type NKN oxide/high work function Pt cathode junction interface.
Place, publisher, year, edition, pages
electrical properties, electrospinning, ferroelectricity/ferroelectric materials, fibers, photoluminescence
IdentifiersURN: urn:nbn:se:kth:diva-199050DOI: 10.1111/jace.14675OAI: oai:DiVA.org:kth-199050DiVA: diva2:1059832
QC 201612272016-12-232016-12-232016-12-27Bibliographically approved