3,4-Didodecyloxybenzylamine (DDOBA), a novel surfactant with two alkyl tail-chains, was designed and synthesized. DDOBA-capped hydrophobic gold nanoparticles were successful y fabricated using formic acid as a reducing agent in a DDOBA/n-butanol/n-heptane/formic acid/HAuCl4·4H2O 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 automatical y form large areas of ordered monolayer built with DDOBA-capped gold nanoparticles at the air/water interface.% 自行设计合成了新颖的苄胺型双链表面活性剂3,4-双十二烷氧基苄胺(DDOBA)。利用DDOBA/正丁醇/正庚烷/甲酸/HAuCl4·4H2O自发形成的水/油(W/O)型微乳液作为微反应器,通过微波辐射下的甲酸还原法成功制备了DDOBA保护的憎水性金纳米粒子,并通过紫外-可见(UV-Vis)光谱、透射电镜(TEM)、高分辨透射电镜(HR-TEM)和X射线衍射(XRD)等方法进行了表征和分析。结果显示, DDOBA既可参与形成稳定的W/O型(油包水型)微乳液,又可作为金纳米粒子的良好保护剂。在合适的微乳液体系组成范围内,用本实验方法可以获得高单分散性的憎水性金纳米粒子,并能在空气/水界面上自动形成大面积短程有序的纳米金二维自组装膜。
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