Probing the surface of platinum nanoparticles with super(13)CO by solid-state NMR and IR spectroscopies

The synthesis and full characterization of platinum nanoparticles (Pt NPs) prepared by decomposition of the Pt(dba) sub(2) complex in the presence of CO and H sub(2) and stabilized either sterically by a polymer, polyvinylpyrrolidone or chemically by a ligand, diphenylphosphinobutane, are reported....

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Bibliographic Details
Published in:Nanoscale 2013-12, Vol.6 (1), p.539-546
Main Authors: Kinayyigit, Solen, Lara, Patricia, Lecante, Pierre, Philippot, Karine, Chaudret, Bruno
Format: Article
Language:English
Subjects:
Infrared radiation
Infrared spectroscopy
Nanocomposites
Nanomaterials
Nanoparticles
Nanostructure
NMR spectroscopy
Platinum
Spectroscopy
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Summary:The synthesis and full characterization of platinum nanoparticles (Pt NPs) prepared by decomposition of the Pt(dba) sub(2) complex in the presence of CO and H sub(2) and stabilized either sterically by a polymer, polyvinylpyrrolidone or chemically by a ligand, diphenylphosphinobutane, are reported. In these studies, super(13)CO was used as a probe molecule to investigate the surface of the particles, using IR and solid-state NMR spectroscopies with magic angle spinning (MAS-NMR). Three nanosystems with different sizes are described: Pt/PVP/ super(13)CO (monomodal: 1.2 nm), Pt/dppb/ super(13)CO (bimodal: 1.2 nm and 2.0 nm) and Pt/dppb/H sub(2) (monomodal: 2.0 nm) NPs. Spectroscopic data suggest a modification of the electronic state of the nanoparticles between 1.2 nm and 2.0 nm which can be related to the presence of Knight shift.
ISSN:2040-3364
2040-3372
DOI:10.1039/c3nr03948j