Controlling the length and shape of gold nanorods

In this paper, we report a new approach to fabricate gold nanowires by controlling the volume of the growth solution. The shape evolutions ranging from fusiform nanoparticles to 1-D rods were observed. Increasing the addition of the growth solution can control the length of nanorods. The length of the rods can be extended to 2 microm, and nanorods with aspect ratios of up to approximately 70 could be obtained.