Figure 5: Hypothetical mechanism for morphology change upon exposure to gamma irradiation and EtOx. Hydroxyl radicals produced during gamma irradiation oxidize the silver nanoparticles to Ag+ ions then reducing agents in solution competitively reduce Ag+ ions to Ag atoms. Since there is not sufficient fresh stabilizer in the solution, coalescence is not well controlled, causing the formed particles to display irregular shapes (e.g. the small particles, ”ribbon”, “sheet” and “wire” structures we observed).