Ultrathin Gold Nanowires: Soft-Templating versus Liquid Phase Synthesis, a Quantitative Study
Résumé
Ultrathin Au nanowires were prepared following two routes: the reduction of the lamellar phase [OY–AuICl] in an excess of pure oleylamine and the direct reduction of AuIII in a solution of oleylamine in hexane. The superiority of the reduction of chloride gold precursor in isotropic environment is evidenced by small-angle X-ray scattering (SAXS) measurements. A reaction yield of 75% is observed, an order of magnitude higher than the route involving the lamellar phase. On the basis of a detailed SAXS analysis, the soft template role of the [OY–AuICl] intermediate solid phase was discarded for the nanowire growth. In the case of the liquid phase synthesis, density functional theory (DFT) calculations evidence a cooperative adsorption and organization of ions pairs at the surface of the ultrathin Au NWs. We propose that this charged backbone plays a key role in the unique growth mechanism of such anisotropic objects.
Domaines
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