Polymer end-group mediated synthesis of well-defined catalytically active platinum nanoparticles

摘要: Simple, short polyethyleneglycol (PEG) chains were found to mediate the synthesis of well-defined 7–8nm cubic and truncated platinum (Pt) particles that required only mild ligand removal conditions yield highly active catalysts for oxygen reduction reaction (ORR). FTIR analyses showed hydroxyl end groups PEG associate with particles, which oxidize readily form carbonyl weaker interactions surface. ORR analysis a mass activity 50 μA μg−1 synthesized Pt nanoparticles (NPs), as compared 45 black. The half-wave potentials NPs black be 427 mV 529 mV, respectively, showing high catalytic towards ORR. Well-defined also produced from amine-terminated PEG, but amines could not removed by simple acid washing, was greatly diminished. Since low molecular weight control particle nucleation growth predominantly through its groups, this work demonstrates is versatile scaffold screen wide variety functional moieties, including biomolecules, templates complex nanoparticle synthesis.