Long Jing, Xiong Wei, Wei Chengyiran, Lu Chengchangfeng, Wang Ruiqing, Deng Chunsan, Liu Huan, Fan Xuhao, Jiao Binzhang, Gao Shan, Deng Leimin
Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China.
School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
Nano Lett. 2020 Jul 8;20(7):5159-5166. doi: 10.1021/acs.nanolett.0c01378. Epub 2020 Jun 5.
The precise placement of semiconductor nanowires (NWs) into two- or three-dimensional (2D/3D) micro-/nanoarchitectures is a key for the construction of integrated functional devices. However, long-pending challenges still exist in high-resolution 3D assembly of semiconductor NWs. Here, we have achieved directional assembly of zinc oxide (ZnO) NWs into nearly arbitrary 3D architectures with high spatial resolution using two-photon polymerization. The NWs can regularly align in any desired direction along the laser scanning pathway. Through theoretical calculation and control experiments, we unveiled the laser-induced assembly mechanism and found that the nonoptical forces are the dominant factor leading to the directional assembly of ZnO NWs. A ZnO-NW-based polarization-resolved UV photodetector of excellent photoresponsivity was fabricated to demonstrate the potential application of the assembled ZnO NWs. This work is expected to promote the research on NW-based integrated devices such as photonic integrated circuits, sensors, and metamaterial with unprecedented controllability of the NW's placement in three dimensions.
将半导体纳米线（NWs）精确放置到二维或三维（2D/3D）微纳结构中是构建集成功能器件的关键。然而，半导体纳米线的高分辨率3D组装仍然存在长期悬而未决的挑战。在此，我们利用双光子聚合实现了氧化锌（ZnO）纳米线向几乎任意3D结构的定向组装，具有高空间分辨率。纳米线可以沿着激光扫描路径在任何所需方向上规则排列。通过理论计算和对照实验，我们揭示了激光诱导的组装机制，发现非光学力是导致ZnO纳米线定向组装的主导因素。制备了具有优异光响应性的基于ZnO纳米线的偏振分辨紫外光探测器，以证明组装的ZnO纳米线的潜在应用。这项工作有望以前所未有的三维纳米线放置可控性促进对基于纳米线的集成器件的研究，如光子集成电路、传感器和超材料。
