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(a) Optical transmission spectra of aqueous suspensions containing the uncoated (black line) and SiO2-coated ZnO nanorods (red line) at concentration 0.5 mg/mL. The SiO2-coated ZnO nanorods are more transparent in the visible spectrum because of their smaller agglomerate size. (b) Diffuse-reflectance measuremnts of dry powders of the uncoated (black line) and SiO2-coated ZnO nanorods (red line). Both curves are identical and exhibit the same band-gap energy.
