title: Gold Nanowire Bundles Grown Radially Outward from Silicon Micropillars.
abstract: One-dimensional (1D) micro- and nanostructures have become increasingly popular because of their tremendous prospect in various applications. While the design and fabrication of these structures from a single component in two-dimensional (2D) arrays is common, the attainment of hierarchical three-dimensional (3D) architectures made up of multicomponent one-dimensional structures is rare. Herein we report, for the first time, the lateral growth of gold nanowires from the sidewalls of substrate grown silicon micropillars to form a unique "wire-on-pillar" architecture. Unlike zero-dimensional (0D) point-like, 1D linear, and 2D planar Au structures, the obtained 3D "wire-on-pillar" Au architecture provides abundant hotspots between adjacent Au wires, which led to remarkably high surface-enhanced Raman scattering (SERS) signals.
authors.affiliation: †School of Chemical and Biomedical Engineering, Nanyang Technological University, 637457, Singapore.|‡Division of Polymer and Composite Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, P. R. China.
authors.forename: Youju
authors.initials: Y
authors.lastname: Huang
authors.affiliation: †School of Chemical and Biomedical Engineering, Nanyang Technological University, 637457, Singapore.
authors.forename: Abdul Rahim
authors.initials: AR
authors.lastname: Ferhan
authors.affiliation: §Department of Chemistry, Hanyang University, Seoul 133-791, Republic of Korea.
authors.forename: Seok-Jin
authors.initials: SJ
authors.lastname: Cho
authors.affiliation: §Department of Chemistry, Hanyang University, Seoul 133-791, Republic of Korea.
authors.forename: Haiwon
authors.initials: H
authors.lastname: Lee
authors.affiliation: †School of Chemical and Biomedical Engineering, Nanyang Technological University, 637457, Singapore.|∥School of Chemical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea.
authors.forename: Dong-Hwan
authors.initials: DH
authors.lastname: Kim
keywords: SERS substrates; gold nanowires; hierarchical nanostructures; silicon nanowire arrays; ultrasensitive detection