Synthesis and Characterization of Gold Nanoparticles with Plasmon Absorbance Wavelength Tunable from Visible to Near Infrared Region
Figure 5
(a) Electron microscopy of long nanorods (AR: ) with plasmon bands > 850 nm. (b) Effect of BDAC/CTAB ratio on the rod aspect ratios and absorption wavelength. High BDAC/CTAB ratio tends to form nanospheres in addition to long rods. (c) Temporal evolution of absorption spectrum over time demonstrating red shifts of the longitudinal bands to longer wavelength as the rod length increases. (d) Temporal evolution of increase in the optical density and longitudinal peak wavelength in the first 14 days and stop. The optical density increases over time indicating the multiply of rod numbers.
