| 초록 |
Great interest has been paid to silica-coated gold (Au@SiO2) nanoparticles due to its surface plasmon resonance effect in many applications such as biological sensor and optical devices. Their unique optical properties rely on the state of particles dispersion, thus their quantitative characterization become important. In this study, we show the dispersion state of Au@SiO2 can be controlled via polymer induced interactions in aqueous media. First, we show the optical property of nanoparticles in polymer solution is strongly dependent on the solvent quality. Second, we quantify the state of particle aggregation and explain mechanisms of particle aggregation with small angle x-ray scattering. If solvent quality is changed, particle aggregation can be trapped forming stable clusters. Thus, one can systematically tune the optical property of gold nanoparticles via aggregation mediated surface plasmon resonance shift. |
