title: Stabilization of 4H hexagonal phase in gold nanoribbons.
abstract: Gold, silver, platinum and palladium typically crystallize with the face-centred cubic structure. Here we report the high-yield solution synthesis of gold nanoribbons in the 4H hexagonal polytype, a previously unreported metastable phase of gold. These gold nanoribbons undergo a phase transition from the original 4H hexagonal to face-centred cubic structure on ligand exchange under ambient conditions. Using monochromated electron energy-loss spectroscopy, the strong infrared plasmon absorption of single 4H gold nanoribbons is observed. Furthermore, the 4H hexagonal phases of silver, palladium and platinum can be readily stabilized through direct epitaxial growth of these metals on the 4H gold nanoribbon surface. Our findings may open up new strategies for the crystal phase-controlled synthesis of advanced noble metal nanomaterials.
authors.affiliation: School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
authors.forename: Zhanxi
authors.initials: Z
authors.lastname: Fan
authors.affiliation: Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 3 Research Link, Singapore 117602, Singapore.
authors.forename: Michel
authors.initials: M
authors.lastname: Bosman
authors.affiliation: 1] School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore [2] Key Laboratory of Flexible Electronics (KLOFE) &Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Huang
authors.affiliation: Institute of High Performance Computing, A*STAR (Agency for Science, Technology and Research), 1 Fusionopolis Way, 16-16 Connexis, Singapore 138632, Singapore.
authors.forename: Ding
authors.initials: D
authors.lastname: Huang
authors.affiliation: Department of Chemistry, University of California, Berkeley, California 94720, USA.
authors.forename: Yi
authors.initials: Y
authors.lastname: Yu
authors.affiliation: Institute of High Performance Computing, A*STAR (Agency for Science, Technology and Research), 1 Fusionopolis Way, 16-16 Connexis, Singapore 138632, Singapore.
authors.forename: Khuong P
authors.initials: KP
authors.lastname: Ong
authors.affiliation: Institute of High Performance Computing, A*STAR (Agency for Science, Technology and Research), 1 Fusionopolis Way, 16-16 Connexis, Singapore 138632, Singapore.
authors.forename: Yuriy A
authors.initials: YA
authors.lastname: Akimov
authors.affiliation: Institute of High Performance Computing, A*STAR (Agency for Science, Technology and Research), 1 Fusionopolis Way, 16-16 Connexis, Singapore 138632, Singapore.
authors.forename: Lin
authors.initials: L
authors.lastname: Wu
authors.affiliation: Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 3 Research Link, Singapore 117602, Singapore.
authors.forename: Bing
authors.initials: B
authors.lastname: Li
authors.affiliation: School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
authors.forename: Jumiati
authors.initials: J
authors.lastname: Wu
authors.affiliation: School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
authors.forename: Ying
authors.initials: Y
authors.lastname: Huang
authors.affiliation: Nanyang Technological University, Temasek Laboratories at NTU, 9th Storey, BorderX Block, Research Techno Plaza 50 Nanyang Drive, Singapore 637553, Singapore.
authors.forename: Qing
authors.initials: Q
authors.lastname: Liu
authors.affiliation: Institute of High Performance Computing, A*STAR (Agency for Science, Technology and Research), 1 Fusionopolis Way, 16-16 Connexis, Singapore 138632, Singapore.
authors.forename: Ching Eng
authors.initials: CE
authors.lastname: Png
authors.affiliation: School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
authors.forename: Chee Lip
authors.initials: CL
authors.lastname: Gan
authors.affiliation: Department of Chemistry, University of California, Berkeley, California 94720, USA.
authors.forename: Peidong
authors.initials: P
authors.lastname: Yang
authors.affiliation: School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
authors.forename: Hua
authors.initials: H
authors.lastname: Zhang