Preparation and Characterization of Ru@Pt Core-Shell Nanoparticles with Shell in Atomic Thickness
Through regulating the amount of PtCl 2and the temperature of reduction, Ru@Pt core-shell monodisperse nanoparticles comprising a Ru core covered with an approximately 1.5 monolayer-thick shell of Pt atoms were synthesized by using a sequential polyol process with RuCl3·xH2O and PtCl2as precursors, ethylene glycol as the reductant and polyvinylpyrrolidone as the stabilizer.The microstructure, size-distribution, crystal structure and phase composition of nanoparticles were characterized by transmission electron microscopy(TEM), X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS)and other analytical methods.The results indicate that the nanoparticles are uniformly distributed and spherical with 3.57 nm average size.The core is about 2.49 nm and the shell is about 0.55 nm.Pt shell has a nice crystalline phase which is mainly {111} lattice fringes.The production of electronic effect is found between Ru core and Pt shell,and this makes the diffraction peak of Pt and the electron binding energy of Ru and Pt produce a certain offset.The factors controlling the thickness of the shell of nanoparticles and strengthening the electronic effect between Ru core and Pt shell have been investigated preliminarily.The Ru@Pt core-shell nanoparticles are expected to have great potential in catalysis and other fields.
sequential polyol methodRu@Pt core-shell nanoparticlesatomic thickness of shellelectronic effect
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