Abstract
3,4-Didodecyloxybenzylamine (DDOBA),a novel surfactant with two alkyl tail-chains,was designed and synthesized.DDOBA-capped hydrophobic gold nanoparticles were successfully fabricated using formic acid as a reducing agent in a DDOBA/n-butanol/n-heptane/formic acid/HAuCl 4 · 4H2O water/oil (W/O) microemulsion system under microwave irradiation.DDOBA-stabilized gold nanoparticles were characterized by ultraviolet-visible (UV-Vis) spectroscopy,transmission electron microscopy (TEM),high resolution transmission electron microscopy (HR-TEM),and X-ray diffraction (XRD).The experimental results showed that DDOBA not only participated in the formation of a stable W/O microemulsion system,but also became a good protecting agent for gold nanoparticles.Within an appropriate concentration range of components in the W/O microemulsion system,hydrophobic gold nanoparticles with high monodispersity can be obtained using this experimental method and automatically form large areas of ordered monolayer built with DDOBA-capped gold nanoparticles at the air/water interface.
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