title: Single-Crystalline Gold Nanowires Synthesized from Light-Driven Oriented Attachment and Plasmon-Mediated Self-Assembly of Gold Nanorods or Nanoparticles.
abstract: Through the light-driven geometrically oriented attachment (OA) and self-assembly of Au nanorods (NRs) or nanoparticles (NPs), single-crystalline Au nanowires (NWs) were synthesized by the irradiation of a linearly-polarized (LP) laser. The process was conducted in a droplet of Au colloid on a glass irradiated by LP near-infrared (e.g. 1064 nm and 785 nm) laser beam of low power at room temperature and atmospheric pressure, without any additive. The FE-SEM images show that the cross sections of NWs are various: tetragonal, pentagonal or hexagonal. The EDS spectrum verifies the composition is Au, and the pattern of X-ray diffraction identifies the crystallinity of NWs with the facets of {111}, {200}, {220} and {311}. We proposed a hypothesis for the mechanism that the primary building units are aligned and coalesced by the plasmon-mediated optical torque and force to form the secondary building units. Subsequently, the secondary building units undergo the next self-assembly, and so forth the tertiary ones. The LP light guides the translational and rotational motions of these building units to perform geometrically OA in the side-by-side, end-to-end and T-shaped manners. Consequently, micron-sized ordered mesocrystals are produced. Additionally, the concomitant plasmonic heating causes the annealing for recrystallizing the mesocrystals in water.
authors.affiliation: Department of Mechanical Engineering, Chang Gung University, Taiwan.
authors.forename: Shang-Yang
authors.initials: SY
authors.lastname: Yu
authors.affiliation: Department of Mechanical Engineering, Chang Gung University, Taiwan.
authors.forename: Hariyanto
authors.initials: H
authors.lastname: Gunawan
authors.affiliation: Graduate Institute of Biochemical and Biomedical Engineering, Chang Gung University, Taiwan.|Department of Orthopaedic Surgery, Chang Gung Memorial Hospital, Taiwan.
authors.forename: Shiao-Wen
authors.initials: SW
authors.lastname: Tsai
authors.affiliation: Department of Mechanical Engineering, Chang Gung University, Taiwan.
authors.forename: Yun-Ju
authors.initials: YJ
authors.lastname: Chen
authors.affiliation: Center for Advanced Molecular Imaging and Translation, Chang Gung Memorial Hospital, Taiwan.|Department of Nuclear Medicine, Chang Gung Memorial Hospital, Taiwan.
authors.forename: Tzu-Chen
authors.initials: TC
authors.lastname: Yen
authors.affiliation: Department of Mechanical Engineering, Chang Gung University, Taiwan.|Center for Advanced Molecular Imaging and Translation, Chang Gung Memorial Hospital, Taiwan.|Medical Physics Research Center, Institute for Radiological Research, Chang Gung University and Chang Gung Memorial Hospital, Taoyuan, 333, Taiwan.|Department of Mechanical Engineering, Ming Chi University of Technology, Taiwan.
authors.forename: Jiunn-Woei
authors.initials: JW
authors.lastname: Liaw