压电纳米线尺寸与机电转换性能的有限元研究  

Finite element analysis study of the size-effect on the electromechanical conversion performance of piezoelectric nanowires

作　　者：王钊[1] 吴嘉胜[1] 梅家立 潘绪敏 贺亚华 王雨[2] 

机构地区：[1]湖北大学物理与电子科学学院,湖北武汉430062 [2]香港理工大学应用物理系,香港999077

出　　处：《湖北大学学报（自然科学版）》2015年第3期242-246,共5页Journal of Hubei University：Natural Science

基　　金：国家自然科学基金(11474088;61274073);湖北省自然科学基金(2014CFB557)资助

摘　　要：采用有限元分析方法研究压电纳米线的形变方式和尺寸对机电转换性能的影响.结果表明,在相同外力作用下,压电纳米线径向弯曲产生的压电势是轴向弯曲的7倍,前者比后者具有更高的机电转换效率.压电纳米线径向弯曲模型中,应力和电场为非均匀分布.纳米线长度的增加可提高其弯曲时产生的压电势,当纳米线长度较短时,应力和电场的非均匀分布使压电势随纳米线长度的增加非线性增大.当纳米线长度超过20 mm时,可忽略非均匀分布对机电转换效率的影响,压电势随纳米线长度的增加线性增加.The effect of deformation and length of the nanowires on their electromechanical conversion properties were studied by using finite element analysis （FEA）. The results show that the piezoelectric potential generated by radically bent nanowire is 7 times higher as that generated by the axially compressed nanowires. The former one exhibits higher electromechanical conversion efficiency than the latter one. The stress and electrical field are non-uniformly distributed in the radically bending models. The increase of nanowire length will lead to the increase of the piezoelectric potential generated by the bent nanowire. When the nanowire is relatively short, the piezoelectric potential will non-linearly increase with the length of the nanowire due to the non-uniformly distributed stress and electrical field. The influence of the non-uniformly distribution of the stress and electrical field can be neglected when the nanowire is longer than 20 mm, which will result in the linear increase of the piezoelectric potential with the length.

关 键 词：压电 能量收集 纳米线 有限元分析 机电转换 

分 类 号：TN712.5[电子电信—电路与系统]