title: Luminescence of colloidal ZnO nanoparticles synthesized in alcohols and biological application of ZnO passivated by MgO.
abstract: This report presents the results of spectroscopic measurements of colloidal ZnO nanoparticles synthesized in various alcohols. Luminescence of colloidal ZnO was monitored under different reaction conditions to elucidate the mechanism of the visible emission. We performed the process in different alcohols, temperatures and reaction times for two different reactants: water and NaOH. Based on the presented and previously published results it is apparent that the luminescence of the nanoparticles is influenced by several competing phenomena: the formation of new nucleation centers, the growth of the nanoparticles and surface passivation. Superimposed on the above effects is a size dependent luminescence alteration resulting from the quantum confinement. The study contributes to our understanding of the origin of ZnO nanoparticles' green emission which is important in a rational design of fluorescent probes for nontoxic biological applications. The ZnO nanoparticles were coated with a magnesium oxide layer and introduced into a HeLa cancer cell.
authors.affiliation: Institute of Physics, Polish Academy of Sciences, Warsaw, Poland. sikorab@ifpan.edu.pl
authors.forename: Bożena
authors.initials: B
authors.lastname: Sikora
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Fronc
authors.forename: Izabela
authors.initials: I
authors.lastname: Kamińska
authors.forename: Kamil
authors.initials: K
authors.lastname: Koper
authors.forename: Piotr
authors.initials: P
authors.lastname: Stępień
authors.forename: Danek
authors.initials: D
authors.lastname: Elbaum
mesh_terms: D000438:Alcohols / Q000737:chemistry*; D003102:Colloids / Q000138:chemical synthesis*; D003287:Contrast Media / Q000138:chemical synthesis; D006367:HeLa Cells; D006801:Humans; D008163:Luminescent Measurements / Q000379:methods*; D008277:Magnesium Oxide / Q000737:chemistry*; D008422:Materials Testing; D008856:Microscopy, Fluorescence / Q000379:methods*; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D012972:Sodium Hydroxide / Q000737:chemistry; D013696:Temperature; D014867:Water / Q000737:chemistry; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D000438:Alcohols; D003102:Colloids; D003287:Contrast Media; D014867:Water; D008277:Magnesium Oxide; D012972:Sodium Hydroxide; D015034:Zinc Oxide