Synthesis and Characterization of Gold Nanoparticles with Plasmon Absorbance Wavelength Tunable from Visible to Near Infrared Region
Figure 1
(a) Representative absorption spectrum of gold nanorod with stronger band in the longitudinal direction. Gold seed (nanosphere) only shows a characteristic band (dashed line). (b) Scanning electron microscopy of rod-shaped gold nanoparticles. (c) Picture demonstrating a vivid color of the gold nanorod colloidals with tunable aspect ratio (AR) to result in distinguishable absorption wavelength from 650 to 1050 nm. The solutions are stable over 6 months. (d) Superimposed absorption spectrum of Au nanorods with various longitudinal peak wavelengths.
