单分散金属介电复合粒子制备及表征研究

过去20年纳米材料科学与技术的飞速发展使人们对于这种新材料寄予极大的期望,合成、组装及设计纳米相材料取得了巨大的进步。一方面单纯的纳米线、纳米杆、纳米晶、纳米管、纳米带、纳米球及量子点材料不断的被报道;另一方面,人们也加大了寻找纳米复合材料的步伐。以二氧化硅等胶体球形粒子为基体发展起来的纳米包覆(nanocoating)技术引起人们的极大兴趣犤1犦。这种纳米包覆技术得到的产物常常被称为核壳粒子(core-shellparticles),通常包括作为核的基体球的表面性质改性与其它材料于表面包覆形成壳层。纳米包覆技术实际上也是粒子表面性质…

Preparation and Characterization of Monodisperse Metallodielectric Composite Particles

Nowadays, metallodielectric composite particles (especially spheres) have been the highlight to scientists due to their potential optical applications. In this paper, with wet chemistry method, we revised the Controlled-Double- Jet-Precipitation (CDJP) method and injected the silver salt and reducing agent into the silica-dispersed solution through two syringes. By changing the injected volume and rate, we obtain silica/silver core/shell particles. TEM images show that the silica surface was coated uniformly with silver nanoparticles and the samples were also uniform and low in polydispersity. Also XRD, EDX, DSC, UV-vis analyses were conducted to characterize thus-prepared samples.