CTAB-Assisted Synthesis of Size- and Shape-Controlled Gold Nanoparticles in SDS Aqueous Solution

摘要

Variously shaped gold nanoparticles were hydrothermally prepared by adding the cationic surfactant cethyltrimetylammonium bromide (CTAB) into the anionic surfactant sodium dodecyl sulfonate (SDS) in aqueous solution at 180℃ without reducing agents and/or templates. Nanoparticle size and shape were controlled by the surfactant mixing ratio CTAB:SDS = X_(CTAB):(1-x_(CTAB)) and reaction time. Increasing CTAB concentration from x = 0.01 to x = 0.07 changes the nanoparticle shape from icosahedron to triangle or ellipse. The influence of the cationic/anionic ratio is presumably due to the differing catanionic micelle structures.