Properties Of Doped Zinc Oxide Research Articles

Structural and antibacterial properties of doped zinc oxide and their composites with hydroxyapatite

ZnO nanoparticles (NPs) doped by Mn2+ and Cu2+ ions at various doping levels and their hydroxyapatite (HA) composites are prepared by a facile hydrothermal and sol-gel method. The resultant doped ZnO NPs are of wurtzite crystal structure and nanorod morphology. The doping of transition metals in ZnO lattice structure offers feasible means to prepare effective antibacterial agent. The antibacterial property against gram-negative bacteria (E. coli) and gram-positive bacteria (S. aureus) shows that both Mn and Cu-doped ZnO NPs are more sensitive to S. aureus and revealed improved antimicrobial activity relative to pristine ZnO. 5% Mn and 10% Cu-doped ZnO NPs exhibited the best antibacterial property. Moreover, the composites by loading 10 wt% Mn-doped ZnO and 10 wt% Cu-doped ZnO on HA exhibit significant antibacterial activity. The CCK-8 experiments show that ZnO/HA composites are noncytotoxic and can promote osteosarcoma cell growth.

Optical Properties of Gallium-Doped Zinc Oxide—A Low-Loss Plasmonic Material: First-Principles Theory and Experiment

Heavily doped transparent conducting oxides are believed to be promising alternatives to noble metals in low-loss plasmonic applications in the technologically important near-infrared range of light. Scientists now report a timely study of the optical properties of doped zinc oxide, assessing its performance in plasmonic devices and establishing a hitherto unrealized connection from doping to crystal structure and optical properties.

Peculiar effects of microwave sintering on ZnO based varistors properties

Non-ohmic properties of doped zinc oxide are widely used in varistors applications. It is well established that final properties of the component are strongly correlated with reactivity of the added phases during sintering process and with final microstructure. In this paper, the specific effects of the hybrid single-mode microwave sintering process on the microstructure and electrical properties of a ZnO-based composition are investigated. Nano-sized ZnO-based powder with a proper amount of Bi 2O 3, Sb 2O 3, CoO and MnO is synthesized by a liquid route and is sintered within a short time (less than 10 min) in a conventional (CV) or by an hybrid single-mode microwave (MW) furnaces. Distinct differences can be seen in the density, reaction kinetics and dopant diffusivity: higher kinetics of MW leads to denser pellet, faster reaction among dopants and faster diffusion of cobalt and manganese into ZnO grains although grain sizes are almost identical between CV and MW. These differences in terms of chemistry and microstructure lead to sharp contrasts in electrical properties.