The size and shape of nanomaterials have a profound impact on their optical properties. For example, as the size of metallic nanoparticles decreases, the wavelength at which SPR occurs shifts, altering the color of the nanoparticles. Similarly, the shape of nanoparticles (spherical, rod-like, or cubic) can significantly influence their optical behavior. Nanorods, for instance, have two SPR peaks corresponding to their length and width, providing more tunable optical properties.
