Bulletin of the Chemical Society of Japan · 2020 · 10 citations · 38 references
Natural SciencesChemistryMaterials ScienceMaterials ChemistryNanomaterialsNanotechnologyNanomaterials SynthesisNanowiresSelf-assembled NanostructuresSelf-assembly Of NanomaterialsTwo-dimensional NanomaterialsAqueous-phase SynthesisCryogenic Electron MicroscopyCryogenic Transmission Electron MicroscopyGold NanostructuresNanowire ArraysNanowire Self-assemblyNanowire SynthesisTwo-dimensional Arrays
Abstract Ultrathin Au nanowires (NWs) with a diameter below 2 nm have attracted considerable attention as a promising one-dimensional nanomaterial. However, they are practically synthesized in organic solvents. Here, for the first time, we report the synthesis of ultrathin Au NWs with ∼1.7 nm diameter in water using a water-soluble long-chain amidoamine derivative (C18AA) as a key compound. The resultant Au NWs were naturally dispersible in water, which is an environment-friendly solvent. We also demonstrate that the formation of the Au NWs is based on oriented-attachment growth mechanism, and that the presence of Cl− ion facilitates its effective elongation over a length of a few µm. Further, cryogenic transmission electron microscopy (cryo-TEM) of the aqueous dispersion revealed that the Au NWs self-assembled into a bundle structure with two-dimensional parallel arrays in water.
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