Nanomaterials have been widely studied over the past decades and one of their potentials is as a source of plasmonic hot electrons. Hot electrons are energetic electrons produced from the decay of the surface plasmon of nanomaterials under irradiation. Studies report that hot electrons can be used to accomplish chemical reactions that are hard to achieve in conventional chemical processes. However, the mechanism of hot electron induced chemical reactions remains unclear and only a few anomaterial species have been studied in this field. In this project, surfactant-free gold nanostars were used as the hot electron source to induce chemical reactions. Ag(CN)2-, Ag+, and 4-Nitrothiophenol (4-NTP) were successfully reduced in the presence of gold nanostars under different conditions. The results were characterized by ultraviolet-visible (UV-Vis) spectroscopy, electron microscopy, energy dispersive X-ray spectroscopy (EDX), and surface enhanced Raman spectroscopy (SERS). It was found that Ag(CN)2- was reduced to form silver in the absence of light, while Ag+ reduction required irradiation of specific wavelengths. 4-NTP molecules were reduced to from 4-aminothiophenol (4-ATP) in ambient conditions. It is proposed that a hybridized state might be important in hot electron transfer processes. However, further work such as computation studies are still required to verify the proposed mechanisms.