TY - JOUR A1 - Bürger, Jasmin-Clara A1 - Gutsch, Sebastian A1 - Zacharias, Margit T1 - Transition from freestanding SnO2 nanowires to laterally aligned nanowires with a simulation-based experimental design JF - Beilstein Journal of Nanotechnology PY - 2020/// VL - 11 SP - 843 EP - 853 SN - 2190-4286 DO - 10.3762/bjnano.11.69 PB - Beilstein-Institut JA - Beilstein J. Nanotechnol. UR - https://doi.org/10.3762/bjnano.11.69 KW - finite element method simulation KW - laterally aligned nanowires KW - planar growth KW - tin oxide KW - vapor–liquid–solid nanowire growth N2 - In this study, we used simulations as a guide for experiments in order to switch freestanding nanowire growth to a laterally aligned growth mode. By means of finite element simulations, we determined that a higher volumetric flow and a reduced process pressure will result in a preferred laterally aligned nanowire growth. Furthermore, increasing the volumetric flow leads to a higher species dilution. Based on our numerical results, we were able to successfully grow laterally aligned SnO2 nanowires out of gold film edges and gold nanoparticles on a-plane sapphire substrates. In our experiments a horizontal 2-zone tube furnace was used. The generation of Sn gas was achieved by a carbothermal reduction of SnO2 powder. However, we observed no elongation of the nanowire length with an increase of the process time. Nevertheless, an alternating gas exchange between an inert gas (Ar) and an oxygen-containing process atmosphere yielded an elongation of the laterally aligned nanowires, indicating that the nanowire growth takes place in a transient period of the gas exchange. ER -