Nanocomposite Langmuir–Blodgett films based on crown derivatized platinum nanoparticles: Synthesis, characterization, and electrical properties
Résumé
This paper deals with the crown derivatization of 4-mercaptoaniline functionalized platinum formation and the use of the resulting nanoparticles to build up controlled Langmuir and Langmuir–Blodgett films. It is shown that the high density of amine functions at the surface of platinum nanoparticles functionalized by 4-mercaptoaniline offers the possibility of over grafting with various molecules giving rise to different rate of crown derivatization ranging from 19% to 45%. The derivatizations process of the organic coating has been characterized by infrared spectroscopy and thermo gravimetric analysis. The elaboration of Langmuir and Langmuir–Blodgett films containing different ratio of derivatized nanoparticles and fatty acid is reported and the thin films are characterized using X-ray photoelectron spectroscopy and small-angle X-ray scattering. A marked structural anisotropy due to the deposition process is revealed, that corresponds in some cases to a well-defined layered organisation. Modifications in electrical conductivity induced by crown derivatization are reported. These crown derivatized particles are currently studied towards the oxygen reduction reaction.