In contrast, Polte and coworkers have investigated the growth mechanism underlying the classical Turkevich method, showing that the mechanism is mainly based on the coalescence and the growth of small gold nuclei (~ 2 -5.5 nm) into bigger spherical particles. Benefitting from the very broad plasmon band, we next discuss the two significant properties of plasmonic particles: the conversion of light into thermal energy and the use of visible light to induce chemical reactions.