Costas Andreea, Florica Camelia, Preda Nicoleta, Apostol Nicoleta, Kuncser Andrei, Nitescu Andrei, Enculescu Ionut
National Institute of Materials Physics, Multifunctional Materials and Structures Laboratory, Functional Nanostructures Group, 405A Atomistilor Street, 077125, Magurele, Ilfov, Romania.
Sci Rep. 2019 Apr 3;9(1):5553. doi: 10.1038/s41598-019-42060-w.
ZnO-CuO core-shell radial heterojunction nanowire arrays were fabricated by a straightforward approach which combine two simple, cost effective and large-scale preparation methods: (i) thermal oxidation in air of a zinc foil for obtaining ZnO nanowire arrays and (ii) radio frequency magnetron sputtering for covering the surface of the ZnO nanowires with a CuO thin film. The structural, compositional, morphological and optical properties of the high aspect ratio ZnO-CuO core-shell nanowire arrays were investigated. Individual ZnO-CuO core-shell nanowires were contacted with Pt electrodes by means of electron beam lithography technique, diode behaviour being demonstrated. Further it was found that these n-p radial heterojunction diodes based on single ZnO-CuO nanowires exhibit a change in the current under UV light illumination and therefore behaving as photodetectors.
通过一种直接的方法制备了ZnO-CuO核壳径向异质结纳米线阵列，该方法结合了两种简单、经济高效且可大规模制备的方法：（i）在空气中对锌箔进行热氧化以获得ZnO纳米线阵列，以及（ii）射频磁控溅射用CuO薄膜覆盖ZnO纳米线的表面。研究了高纵横比ZnO-CuO核壳纳米线阵列的结构、成分、形态和光学性质。通过电子束光刻技术使单个ZnO-CuO核壳纳米线与Pt电极接触，证明了二极管行为。进一步发现，这些基于单个ZnO-CuO纳米线的n-p径向异质结二极管在紫外光照射下电流会发生变化，因此表现为光电探测器。
