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

Solen Kinayyigit (1) , Patricia Lara (1) , Pierre Lecante (2, 3) , Karine Philippot (1) , Bruno Chaudret (4)

1 LCC - Laboratoire de chimie de coordination
2 CEMES - Centre d'élaboration de matériaux et d'études structurales
3 CEMES-SINanO - Surfaces, Interfaces et Nano-Objets
4 LPCNO - Laboratoire de physique et chimie des nano-objets

The synthesis and full characterization of platinum nanoparticles (Pt NPs) prepared by decomposition of the Pt(dba)2 complex in the presence of CO and H2 and stabilized either sterically by a polymer, polyvinylpyrrolidone or chemically by a ligand, diphenylphosphinobutane, are reported. In these studies, 13CO 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/13CO (monomodal: 1.2 nm), Pt/dppb/13CO (bimodal: 1.2 nm and 2.0 nm) and Pt/dppb/H2 (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.

Domaines: Chimie de coordination

Solen Kinayyigit, Patricia Lara, Pierre Lecante, Karine Philippot, Bruno Chaudret. Probing the surface of platinum nanoparticles with 13CO by solid-state NMR and IR spectroscopies. Nanoscale, 2014, 6 (1), pp.539-546. ⟨10.1039/c3nr03948j⟩. ⟨hal-00992176⟩