Synthesis and optical properties of different colloidal systems of gold nanoparticles in a chiral dispersant agent

Three kinds of colloids containing gold nanoparticles (AuNP) were obtained by three different methods of synthesis, using castor oil as dispersant agent and tetrachloroauric (III) acid as gold source. The colloidal systems were characterized by Uv-vis spectroscopy and transmission electron microscopy (TEM). Each method gave rise to quasispherical shape and different size distribution of AuNP. The TEM images of the nanostrutured systems show that from each method of synthesis, nanoparticles of different average sizes, equal to 7, 15, and 55 nm, were produced. These characteristics are reflected by the presence of different maximum wavelength absorption, indicating that each colloid presents distinct surface Plasmon resonance bands.

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