Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 12: Nanostructures at Surfaces II: Designer Structures and Surfaces

O 12.3: Vortrag

Montag, 1. April 2019, 15:45–16:00, H15

Low temperature chemical vapor deposition of ZnO nanowire arrays for field emission applications — •Carina Hedrich, Stefanie Haugg, Robert H. Blick, and Robert Zierold — Center for Hybrid Nanostructures (CHyN), Universität Hamburg, Luruper Chaussee 149, 22607 Hamburg, Germany

In the last years, ZnO nanostructures of many different morphologies have been fabricated by various physical and chemical methods and several applications have been realized. Arrays of one-dimensional ZnO nanostructures are promising candidates for electron field emission devices due to their high aspect ratio and low work function of the material. To tailor the synthesis of ZnO nanowires, the influence of the growth parameters on the properties of the nanostructures have to be known. Here, we report about a comprehensive morphology study of ZnO nanowire arrays grown by low temperature (500 -650 °C) chemical vapor deposition as a function of the process parameters. The vapor transport growth was conducted by utilizing zinc acetylacetonate hydrate and oxygen as precursors. The electron field emission characteristics of optimized ZnO nanowire array devices are investigated, by measuring the electron tunnel current as a function of the applied voltage, using a home-made electron field emission setup. Analysis of the field emission data reveal the potential of our nanostructures for tailor-made electron field emission devices. In the future, such ZnO nanowire arrays on silicon nitride membranes might pave the way for advanced detector technologies used in time-of-flight mass spectrometry of proteins with much higher mass resolution than nowadays accessible.

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