Encapsulation of a Single Metal Nanoparticle with Tunable Size in a Monodisperse Polymer Microcapsule

Abstract

A versatile approach to fabricate monodisperse poly[styrene-co-(divinyl benzene)] (PS-co-DVB) microcapsules that contain a single gold nanoparticle (AuNP) has been demonstrated. Using the PS-co-DVB microcapsule as a microreactor, aqueous HAuCl(4) and NaBH(4) solutions are subsequently infiltrated. The size of the resulting AuNP inside of the PS-co-DVB microcapsules is easily tunable by controlling the repeated infiltration cycles of aqueous HAuCl(4) and NaBH(4) . PS-co-DVB microcapsules that contain a single silver and palladium nanoparticle are also obtained by following a similar protocol.

Fabrication of Yolk-Shell Cu@C Nanocomposites as High-Performance Catalysts in Oxidative Carbonylation of Methanol to Dimethyl Carbonate

“…Once the larger ones form, the remaining Cu nuclei within the cavity will be successively absorbed onto the surface of the preformed particles, which results in the growth of Cu nanocrystal. Similar mechanism also has been proposed elsewhere [ 23 ]. Based on the nucleation-and-growth process, it could be inferred that the size of the resulting Cu core can be controlled by adjusting the amount of copper salt precursor accommodated in the confined cavity.…”

A simple approach to obtain hybrid Au-loaded polymeric nanoparticles with a tunable metal load

“…Afterwards, the removal of the sacrificial silica layer by an etching agent yields polymeric capsules that contain inner single NPs. Although the template-assisted approach is a promising way to create hybrid NPs with an excellent control on the loading of inorganic cores, it involves a rigorous regulation of the reaction conditions 18 and a further template removal step that may introduce stability problems and/or induce chemical attachment on the NP cores.…”

Porous yolk–shell microspheres as N–doped carbon matrix for motivating the oxygen reduction activity of oxygen evolution oriented materials

“…The distinct structural characteristic made them promising candidates for highly active catalysts: (i) high specific areas with plentiful active sites for ORR process offered by their nanocrystal subunits; (ii) electrochemical kinetics enhanced by the short diffusion lengths; and (iii) catalytic stabilities benefited by structural integrity [17,19]. Two essential routes were used to fabricate yolk-shell structures: a bottom-up route in an inside to outside order [20][21][22][23][24]; a top-down route, also called pre-shell post-core approach [25][26][27]. Basically, yolk-shell particles have mostly been produced through templating methods with core-shell materials as building blocks [28,29] which confined their scalability and compatibility with practical manufacturing processes.…”