Dependence of Gd-doped ZnO surfaces fluorescent properties on dopant concentration

Substrates containing zinc oxide and different amounts of gadolinium on the surface of the zinc oxide nano particles for biosensorics were obtained for the first time by the standard sol-gel technique. This is a new material has not yet been extensively studied. In this paper, we present the results of the photoluminescent response of the zinc oxide surface when it is modified by various amounts of gadolinium during the classical sol-gel method of the surface obtaining. Aspects of creating a modified surface of zinc oxide are highlighted. The used concentrations of gadolinium vary from 1 to 33% caused both quenching and ignition of photoluminescence at the wavelength of 356 nm upon excitation into the absorption band of protein 280 nm. The photoluminescence intensity of zinc oxide without doping is 40 relative value units, the addition of 8% Gd increases the photoluminescence by 7 times (280 r.u.), the addition of 31% Gd decreases the photoluminescence by 40 times compared to undoped zinc oxide. The resulting possibility of increased luminescence when the doping of the films with gadolinium willing, apparently, to increase the ratio “signal/background”, and therefore increase the sensitivity of the biosensor with fluorescent registration. © 2018 TANGER Ltd. All Rights Reserved.