Fabrication of Helical Nanostructures by Misfit Strain

利用不同材料涂层引起的失配应变，发展了一种永久性弯曲纳米线技术。弯曲的驱动力是残余应力。这一新的力学过程依赖于弯曲强化，其中通过提高温度来消除NW对弯曲变形的约束，从而仅在NW中诱导蠕变流动。并从分子动力学模拟和连续介质力学两个方面进行了理论研究。此外，还建造了一个机械手来抓取和定位NW。在机械手的帮助下，弯曲技术演示了微/纳米线圈的制造。

A permanently bending technique of nanowires (NWs) was developed using misfit strain due to dissimilar material coating. The driving force of the bending is the residual stress. The novel mechanical process relies on a bending enhancement, where an NW's constraint against the bending deformation is removed by elevating temperature for inducing creep flow only in the NW. Theoretical investigations were also made in terms of molecular dynamics simulations and continuum mechanics. Furthermore, a manipulator was built for gripping and positioning an NW. With a help of the manipulator, the bending technique demonstrated the fabrication of micro/nanocoils.