We grew silicon nanowires (SiNWs) by a vapor-liquid-solid (VLS) mechanism using metal catalysts of gold (Au), titanium (Ti), manganese (Mn), and iron (Fe) under a high flow rate of hydrogen (H2). This combination of catalyst types and high gas flow rate revealed the potential for growing various SiNWs, including kinked SiNWs (with Au), ultra-thin SiNWs having diameters about 5 nm (with Ti), rough-surfaced SiNWs (with Mn), and ribbon-shaped SiNWs tens of microns in width (with Fe). The high flow rate of gas affects the VLS mechanism differently for each combination; for example, it induces an unstable solid-liquid interfaces (with Au), active etching of the catalyst (with Ti), sidewall deposition by a vapor-solid (VS) mechanism, and an asymmetric precipitation of Si in the catalyst (with Fe). Our combinatorial approach may provide a new path for the structural modulation of SiNWs via the VLS mechanism.
Bibliographical noteFunding Information:
This research was supported by Nanomaterials Technology Development program (Green Nano Technology Development program) through the National Research Foundation of Korea (NRF) funded by the Ministry of Education Science and Technology (NRF-2014M3A7B4051580) and grant (NRF-2012R1A2A1A03010558) from the National Research Foundation (NRF) of Korea funded by the Ministry of Science, the Yonsei University-SNU collaborative Research Fund of 2014.
© 2015, Seo et al.; licensee Springer.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics