;Enhancing photocatalytic activities by surface plasmon resonance effect has been a popular issue in recent years. In our past research, we successfully apply surface plasmon resonance from gold-silver nanoparticles (GSNS NPs) to promote photocatalytic hydrogen production efficiency of ZnIn2S4. Due to a tunable band gap of AgInS2-ZnS (AIZS), AIZS solid solutions are used as the coating material to cover silica-coated gold-silver nanoparticles (GSNS@SiO2). Because of difficult synthesis of GSNS@SiO2, silica serves as the main coating target of AIZS. We used heating up method to coat AIZS onto silica surface in organic solvents, while two important parameters, temperature and composition, were varied to discuss its effect to coating results. Furthermore, in order to increase hydrophilicity of SiO2@AIZS synthesized in organics, we applied surface ligand exchange to do modification on its surface. Results of modification showed not only hydrophilicity obviously improved but hydrogen production efficiency increased substantially. Finally, synthesis method was carried out on GSNS@SiO2. However, due to easier aggregation of GSNS@SiO2 and difference of particle size between SiO2 and GSNS@SiO2, consequence of coating on GSNS@SiO2 was not as expected. Although it took time to study enhancing AIZS efficiency by surface plasmon resonance, our facile procedure paved the way to synthesize core-shell structure GSNS@dielectric@photocatalyst.
