Xiao Yao, Wang Chengyuan, Feng Yuantian
Zienkiewicz Centre for Computational Engineering, College of Engineering, Swansea University, Bay Campus, Fabian Way, Swansea, Wales SA2 8EN, UK.
Nanomaterials (Basel). 2016 Dec 15;6(12):242. doi: 10.3390/nano6120242.
A hybrid nanowire (HNW) was constructed by coating a single-wall carbon nanotube (SWCNT) with piezoelectric zinc oxide (ZnO). The two components of the HNW interact with each other via the van der Waals (vdW) force. This paper aims to study the effect of the piezoelectricity in the ZnO layer and the inter-phase vdW interaction on the fundamental vibration of the HNWs. In doing this, a new model was developed where the two components of the HNWs were modeled as Euler beams coupled via the interphase vdW interaction. Based on the model, the dependence of the frequency on an applied electrical voltage was calculated for HNWs of different geometric sizes to reveal the voltage effect. The results were then compared with those calculated without considering the inter-phase vdW interaction. It was found that the interphase vdW interaction can substantially decrease the structural stiffness, leading to a greatly enhanced piezoelectric effect but a lower frequency for the vibration of the HNWs.
通过用压电氧化锌（ZnO）包覆单壁碳纳米管（SWCNT）构建了一种混合纳米线（HNW）。HNW的两个组分通过范德华（vdW）力相互作用。本文旨在研究ZnO层中的压电性和相间vdW相互作用对HNWs基本振动的影响。为此，开发了一个新模型，其中将HNWs的两个组分建模为通过相间vdW相互作用耦合的欧拉梁。基于该模型，计算了不同几何尺寸的HNWs频率对施加电压的依赖性，以揭示电压效应。然后将结果与不考虑相间vdW相互作用时计算的结果进行比较。发现相间vdW相互作用可显著降低结构刚度，导致压电效应大大增强，但HNWs振动的频率较低。
