title: An ultra sensitive fluorescent nanosensor for detection of ionic copper.
abstract: A stable and ultra sensitive nano-scale fluorescent chemo-sensor for trace amounts of Cu(2+) was proposed. The Cu(2+) selective fluoroionophore 2-{[(2-aminophenyl)imino]methyl}-4,6-di-tert-butylphenol (DMK-7) was encapsulated in polymeric ethyl cellulose. The sensing membranes were fabricated in form of nanofibers and thin films. When embedded in polymers, the exploited DMK-7 dye exhibited enhanced photophysical characteristics in absorbance, Stoke's shift, fluorescence quantum yield, and short and long-term photostability with respect to the solution phase. Sensing abilities of the nanofibers and thin films were tested by steady state and time resolved fluorescence spectroscopy. To our knowledge, this is the first attempt using the DMK-7-doped electrospun nanofibrous materials for copper sensing. The offered sensor displayed a sensitive response with a detection limit of 3.3×10(-13) M for Cu(2+) ions over a wide concentration range of 5.0×10(-12)-5.0×10(-5). Additionally, exhibited high selectivity over convenient cations; Na(+), K(+), Ca(2+), Mg(2+), NH4(+) and Ag(+), Al(3+), Ba(2+), Co(2+), Cr(3+), Fe(3+), Fe(2+), Hg(2+), Li(+), Mn(2+), Ni(2+), Pb(2+), Sn(2+) and Zn(2+).
authors.affiliation: Giresun University, Faculty of Engineering, Department of Food Engineering, 28200 Giresun, Turkey; University of Dokuz Eylul, The Graduate School of Natural and Applied Sciences, Department of Chemistry, 35160 Izmir, Turkey.
authors.forename: Sibel
authors.initials: S
authors.lastname: Kacmaz
authors.affiliation: University of Dokuz Eylul, Faculty of Sciences, Department of Chemistry, 35160 Izmir, Turkey; University of Dokuz Eylul, Center for Fabrication and Application of Electronic Materials (EMUM), 35160 Izmir, Turkey.
authors.forename: Kadriye
authors.initials: K
authors.lastname: Ertekin
authors.affiliation: University of Ege, Faculty of Sciences, Department of Chemistry, 35100 Izmir, Turkey.
authors.forename: Deniz
authors.initials: D
authors.lastname: Mercan
authors.affiliation: University of Dokuz Eylul, Faculty of Sciences, Department of Chemistry, 35160 Izmir, Turkey.
authors.forename: Ozlem
authors.initials: O
authors.lastname: Oter
authors.affiliation: University of Ege, Faculty of Sciences, Department of Chemistry, 35100 Izmir, Turkey.
authors.forename: Engin
authors.initials: E
authors.lastname: Cetinkaya
authors.affiliation: University of Dokuz Eylul, Faculty of Engineering, Department of Metallurgical and Materials Engineering, 35160 Izmir, Turkey; University of Dokuz Eylul, Center for Fabrication and Application of Electronic Materials (EMUM), 35160 Izmir, Turkey.
authors.forename: Erdal
authors.initials: E
authors.lastname: Celik
mesh_terms: D002138:Calibration; D002482:Cellulose / Q000031:analogs & derivatives / Q000737:chemistry; D003300:Copper / Q000032:analysis*; D005456:Fluorescent Dyes / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007477:Ions / Q000032:analysis; D007700:Kinetics; D057139:Nanofibers / Q000737:chemistry* / Q000648:ultrastructure; D011789:Quantum Theory; D012997:Solvents; D013050:Spectrometry, Fluorescence / Q000295:instrumentation*
chemical_list: D005456:Fluorescent Dyes; D007477:Ions; D012997:Solvents; D003300:Copper; C013517:ethyl cellulose; D002482:Cellulose
keywords: Copper; Cu (II); Electrospinning; Fluorescent probes; Nano-scale sensor; Optical sensors