All colloids were analyzed with UV/Vis extinction spectroscopy (JASCO, model V-700) and TEM (JOEL, model JEM 1400 Plus), respectively. UV/Vis extinction spectra were obtained from 400 to 800 nm of the 700 µL sample. Additionally, 7 µL of the colloids were added, dried on a carbon-coated TEM grid, and measured with an acceleration voltage of 120 kV and a LaB6 filament).