Stabilization of 4H hexagonal phase in gold nanoribbons
نویسندگان
چکیده
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.
منابع مشابه
Epitaxial growth of unusual 4H hexagonal Ir, Rh, Os, Ru and Cu nanostructures on 4H Au nanoribbons.
Metal nanomaterials normally adopt the same crystal structure as their bulk counterparts. Herein, for the first time, the unusual 4H hexagonal Ir, Rh, Os, Ru and Cu nanostructures have been synthesized on 4H Au nanoribbons (NRBs) via solution-phase epitaxial growth under ambient conditions. Interestingly, the 4H Au NRBs undergo partial phase transformation from 4H to face-centered cubic (fcc) s...
متن کاملEpitaxial growth of unusual 4H hexagonal Ir, Rh, Os, Ru and Cu nanostructures on 4H Au nanoribbons† †Electronic supplementary information (ESI) available: Experimental section including materials, synthesis and characterization, and supporting data. See DOI: 10.1039/c6sc02953a Click here for additional data file.
Center for Programmable Materials, Schoo Nanyang Technological University, 50 Singapore. E-mail: [email protected]; Web Advanced Membranes and Porous Ma Engineering Division, King Abdullah Unive 23955-6900, Saudi Arabia Institute of Materials Research and Enginee Research (A*STAR), 2 Fusionopolis Way, Inn † Electronic supplementary information including materials, synthesis and chara DOI: 10.10...
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