title: Structural modulation of silicon nanowires by combining a high gas flow rate with metal catalysts.
abstract: 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.
  80; 81; 82.
authors.affiliation: Department of Materials Science and Engineering, Yonsei University, Seoul, 120-749 Korea.
authors.forename: Dongjea
authors.initials: D
authors.lastname: Seo
authors.affiliation: Department of Materials Science and Engineering, Yonsei University, Seoul, 120-749 Korea.
authors.forename: Jaejun
authors.initials: J
authors.lastname: Lee
authors.affiliation: Department of Materials Science and Engineering, Yonsei University, Seoul, 120-749 Korea.
authors.forename: Sung Wook
authors.initials: SW
authors.lastname: Kim
authors.affiliation: Department of Materials Science and Engineering, Yonsei University, Seoul, 120-749 Korea.
authors.forename: Ilsoo
authors.initials: I
authors.lastname: Kim
authors.affiliation: Department of Materials Science and Engineering, Yonsei University, Seoul, 120-749 Korea.
authors.forename: Jukwan
authors.initials: J
authors.lastname: Na
authors.affiliation: Department of Materials Science and Engineering, Yonsei University, Seoul, 120-749 Korea.
authors.forename: Min-Ho
authors.initials: MH
authors.lastname: Hong
authors.affiliation: Department of Materials Science and Engineering, Yonsei University, Seoul, 120-749 Korea.
authors.forename: Heon-Jin
authors.initials: HJ
authors.lastname: Choi
keywords: Catalyst; Growth; SiNW; Structural modulation; Vapor-liquid-solid