Probing real time gold nanostar formation process using two-photon scattering spectroscopy

► We demonstrate real time shape evolution of intermediates of colloidal nanoparticles. ► We show intermediate nanoparticles number density change can be monitored using in-situ TPS experiment. ► Results help to understand the growth mechanisms of the shape evaluation for gold nanocrystals. ► Overall process consists nucleation, Ostwald ripening and intraparticle ripening.