Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China.
Sci Rep. 2013;3:2429. doi: 10.1038/srep02429.
Shape manipulation of nanowires is highly desirable in the construction of nanostructures, in producing free-standing interconnect bridges and as a building block of more complex functional structures. By introducing asymmetry in growth parameters, which may result in compositional or microstructural non-uniformity in the nanowires, thermal annealing can be used to induce shape modification of free-standing nanowires. We demonstrate that such manipulation is readily achieved using vertically grown Pt-Ga-C composite nanowires fabricated by focused-ion-beam induced chemical vapor deposition. Even and controllable bending of the nanowires has been observed after a rapid thermal annealing in a N2 atmosphere. The mechanisms of the shape modification have been examined. This approach has been used to form electrical contacts to freestanding nano-objects as well as nano-'cages' for the purpose of securing ZnO tubs. These results suggest that thermally induced bending of nanowires may have potential applications in constructing three-dimensional nanodevices or complex structures for the immobilization of particles and large molecules.
在构建纳米结构、制作独立互连桥以及作为更复杂功能结构的构建块时，对纳米线进行形状操控是非常理想的。通过引入生长参数的不对称性，可能导致纳米线在成分或微观结构上的不均匀性，热退火可以用来诱导独立纳米线的形状改变。我们证明，使用通过聚焦离子束诱导化学气相沉积制造的垂直生长的 Pt-Ga-C 复合纳米线，可以很容易地实现这种操控。在氮气气氛中进行快速热退火后，观察到纳米线均匀且可控的弯曲。还研究了形状改变的机制。这种方法已被用于形成与独立纳米物体的电接触，以及用于固定 ZnO 管的纳米“笼”。这些结果表明，热诱导的纳米线弯曲可能在构建三维纳米器件或用于固定颗粒和大分子的复杂结构方面具有潜在的应用。
