Evidence of a unique electron donor-acceptor property for platinum nanoparticles as studied by XPS.
In the interaction of PVP with Pt nanoparticles <7 nm in size, charge transfer is from carbonyl groups in PVP to Pt nanoparticles, whereas in the interaction of PVP with bulk Pt or Pt nanoparticles >25 nm in size, charge transfer is from Pt metal to the polymer side chain of PVP. There exists a critical nanoparticle size between 7 and 25 nm that would lead to a switch in the electron donor-acceptor property.
Qiu
Limei
L
Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, PR China.
Liu
Fen
F
Zhao
Liangzhong
L
Yang
Wensheng
W
Yao
Jiannian
J