Formation of an isolated spherical three-dimensional nanoparticle assembly as stable submicrometer-sized units by using an inorganic wrapping technique

A general strategy for preparing a stable assembly of nanoparticles was demonstrated. It was emphasized that almost all the titanium dioxide-wrapped particles could be dispersed independently using this technique and their aggregation was not observed. As such, this nanoparticle assembly and wrapping technology can be widely applied to other metal and semiconductor particles as well as to nanosized materials.