Implantation of FeO Nanoparticles in Shells of Au@m-SiO Yolk@Shell Nanocatalysts with Both Improved Recyclability and Catalytic Activity.

Multifunctional nanocatalysts of Au@FeO/m-SiO yolk@shell hybrids had been developed through a template-assisted synthesis, where FeO nanoparticles (∼12 nm) and m-SiO shells were sequentially assembled on surfaces of Au/SiO core/shell templates, followed by selective etching of the inner SiO cores, leading to the formation of Au@FeO/m-SiO yolk@shell hybrids. The FeO nanoparticles were implanted in the inner surfaces of m-SiO shells with partially exposed surfaces to the inner cavity. The novel design not only ensures a high surface area (540.

FeO@PANI Hybrid Shell as a Multifunctional Support for Au Nanocatalysts with a Remarkably Improved Catalytic Performance.

Au@FeO@PANI hybrid shells with controllable polyaniline (PANI) coatings as advanced supported catalysts have been fabricated. Specifically, FeO and Au nanoparticles were assembled on SiO templates, followed by conducting polymer PANI coating, leading to the formation of Au@FeO@PANI hybrid shells after the template removal. The resultant supported Au nanocatalysts not only maintain hollow structures but also possess high saturation magnetization (65.

Aqueous Solution-Based Fe3O4 Seed-Mediated Route to Hydrophilic Fe3O4-Au Janus Nanoparticles.

Hydrophilic Fe3O4-Au Janus nanoparticles have been synthesized through a facile aqueous solution-based Fe3O4 seed-mediated chemical reduction route, where Au nanoparticles can be in situ formed on surfaces of PVP-modified Fe3O4 nanoparticles by adopting the well-known citrate reduction route. The diameter of Au nanoparticles can be controllably tuned in the range of 3-12 nm by simply changing the initial molar ratio between sodium citrate and auric acid. The as-fabricated hydrophilic Fe3O4-Au Janus nanoparticles have shown excellent catalytic performance with high catalytic activity and recyclability due to the synergetic effect between Au and Fe3O4 nanoparticles.