Construction of Au@Pt core--satellite nanoparticles based on in-situ reduction of polymeric ionic liquid protected gold nanoparticles

Abstract

A method of in-situ reduction to prepare Au@Pt core–satellite nanoparticles (NPs) is described by using Au NPs coating poly[1-methyl 3-(2-methacryloyloxy propylimidazolium bromine)] (PMMPImB-@-Au NPs) as the template. After electrostatic complex chloroplatinic acid with PMMPImB shell, the composite NP was directly reduced with N₂H₄ to produce Au@Pt core–satellite NPs. The characterization of composite and core–satellite NPs under different amounts of chloroplatinic acid were studied by DLS, UV-vis absorption spectrum and TEM. The satellite Pt NPs with a small size (~2 nm) dotted around Au core, and the resulting Au@Pt core–satellite NPs showed a red-shift surface plasmon resonance (SPR) and a good dispersion due to effectively electrostatic repulsion providing by the polymeric ionic liquid (PIL) shell. Finally, Au@Pt core–satellite NPs exhibit an enhanced catalytic activity and cycled catalytic capability for the reduction of p-nitrophenol with NaBH₄.

Keywords

polymeric ionic liquid / gold nanoparticles / platinum nanoparticles / core--satellite

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