Polymer/Metal Nanocomposites: Assembly of Metal Nanoparticles in Polymer Films and their Applications

We have developed a simple dry process to assemble metal nanoparticles in polymer films in two- and three-dimensions in multi-length scales. The vapor of bis(acetylacetonato)palladium(II) (Pd(acac)(2)) is reduced by polymers without additional reducing agents in N-2 atmosphere at 180 degrees C, and Pd metal nanoparticles are produced in the polymer films with excellent size uniformity and stabilization. We showed the self-assembly of Pd nanoparticles into selective nanodomains in block copolymer (BC) films to provide three-dimensional layer-by-layer arrangements and hexagonally arranged spherical nanodomains. In addition to this " bottom-up " approach for the construction of well-ordered polymer/metal nanocomposites, we have also developed a " top-down " approach that enables the assembly of Pd nanoparticles by UV photolithography. Properties of polymer/metal nanocomposites thus prepared have potentials for functional materials and fabrications of nanodevices by ensemble of unique properties of metal nanoparticles and polymers.