title: Hydrothermal synthesis and humidity sensing property of ZnO nanostructures and ZnO-In(OH)3 nanocomposites.
abstract: Prism- and raspberry-like ZnO nanoparticles and ZnO-In(OH)(3) nanocomposites were prepared by template free hydrothermal method. XRD investigations and microscopic studies showed that pill-like In(OH)(3) particles with body-centered cubic crystal structure formed on the surface of ZnO nanoparticles resulting in increased specific surface area. TEM-EDX mapping images demonstrated that not only nanocomposite formation took place in the course of the synthesis, but zinc ions were also built into the crystal lattice of the In(OH)(3). However, only undoped In(OH)(3) was found on the surface of the pill-like particle aggregates by XPS analyses. The raspberry- and prism-like ZnO particles exhibit strong visible emission with a maximum at 585 and 595 nm, respectively, whose intensity significantly increase due to nanocomposite formation. Photoelectric investigations revealed that photocurrent intensity decreased with increasing indium ion concentration during UV light excitation, which was explained by increase in visible fluorescence emission. QCM measurements showed that morphology of ZnO and concentration of In(OH)(3) had an influence on the water vapor sensing properties.
authors.affiliation: University of Bremen, Faculty of Production Engineering, Bremen, Germany. edit.pal@uni-bremen.de
authors.forename: Edit
authors.initials: E
authors.lastname: Pál
authors.forename: Viktória
authors.initials: V
authors.lastname: Hornok
authors.forename: Robert
authors.initials: R
authors.lastname: Kun
authors.forename: Albert
authors.initials: A
authors.lastname: Oszkó
authors.forename: Torben
authors.initials: T
authors.lastname: Seemann
authors.forename: Imre
authors.initials: I
authors.lastname: Dékány
authors.forename: Matthias
authors.initials: M
authors.lastname: Busse