Diameter-dependent radial and tangential elastic moduli of ZnO nanowires
Diameter-dependent radial and tangential elastic moduli of ZnO nanowires
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DOI：
10.1021/nl071986e
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发表时间：
2007-12-01
期刊：
影响因子：
10.8
通讯作者：
Cook, R. F.
中科院分区：
文献类型：
--
作者：
Stan, G.;Ciobanu, C. V.;Cook, R. F.
我们展示了如何使用接触共振原子力显微镜(CR-AFM)来精确测定直径小于150 nm的[0001]氧化锌纳米线的径向弹性系数。使用一个真实的针尖-纳米线接触几何结构，我们从CR-AFM数据中得到径向压痕模数，从摩擦型测量中得到切向剪切模数。当线材直径减小到80 nm以下时，这两个模数都有明显的增加。弹性性能的尺寸依赖关系可以用核壳模型来解释，该模型解释了块状核心和弹性更坚硬的表面层。
We show how contact resonance atomic force microscopy (CR-AFM) can be used to accurately determine the radial elastic moduli of [0001] ZnO nanowires with diameters smaller than 150 nm. Using a realistic tip-nanowire contact geometry, we find the radial indentation modulus from CR-AFM data and the tangential shear modulus from friction-type measurements. Both moduli show a pronounced increase when the wire diameter is reduced below 80 nm. The size dependence of the elastic properties can be explained by a core-shell model that accounts for a bulk-like core and an elastically stiffer surface layer.