Manufacture of ZnO microtubes decorated with nanowires and nanosticks and characterization by PAC spectroscopy

by Prof. Artur W Carbonari (Instituto de Pesquisas Energéticas e Nucleares, IPEN, São Paulo, SP, Brazil)

Wednesday 20 Jan 2016, 14:30 → 15:30 Europe/Zurich

26 1 022 (CERN)

Coaxial core/shell structured ZnO microwires and ZnO microtubes with nanosticks in the inner and nanowires on the outer surface were prepared as a novel hierarchical micro/nanoarchitecture with great potential for technological applications. The Zn/ZnO coaxial core-shell microwires consisted of a metallic core (Zn) and a ZnO semiconducting shell comprised by a thin oxide layer covered with a high density of nanowires showed magnetoresistance effect. Microtubes decorated with nanowires on the external surface are obtained. In an intermediate stage, a hierarchical morphology comprised of discrete nanosticks in the inner surface of the microtube has been found. Hyperfine interaction measurements disclosed the presence of confined metallic Zn regions at the interface between linked ZnO grains forming a chain and a ZnO thicker layer.