SIZE-CONTROLLABLE SYNTHETIC METHOD OF GOLD BIPYRAMID NANOCRYSTAL

摘要

A one-dimensional bipyramid gold nanocrystal was successfully synthesized through a seed-medium method using cetyltrimethylammonium chloride (CTAC) functioning as a surface stabilizing agent and a shape-directing agent, gold nanoparticle seed, Ag cation, and a reducing agent. When an optimum amount of Ag cation is added, this had a decisive influence on manufacturing sharp-edge bipyramid gold. The length of the synthesized bipyramid gold and the optical characteristic was precisely controllable by changing the amount of salycilate added during synthesizing. Rod-like micelle each having different shape and strength manufactured using aqueous solutions of cetyltrimethylammonium-salycilate mixture functions as an effective flexible mold or a structure-directing agent in one-dimensional nanocrystal synthesization having different lengths. The present invention shows how to control the one-dimensional bipyramid gold nanocrystal synthesized by changing the parameter of the rod-like micelle acting as a flexible mold during synthesizing.