XPS demonstration of π-π interaction between benzyl mercaptan and multiwalled carbon nanotubes and their use in the adhesion of Pt nanoparticles

We have carried out the functionalization of multiwalled carbon nanotubes (MWCNTs) via pi-pi interaction with benzyl mercaptan. The presence of noncovalently bonded benzyl mercaptan was demonstrated by X-ray photoelectron spectroscopy, which revealed spectral changes indicating its pi-pi interaction with the CNTs. The subsequent bonding of the thiol groups to both evaporated and chemically reduced Pt nanoparticles was demonstrated by the formation of strong Pt-S bonds in the Pt 4f and S 2p spectra. High-resolution transmission electron microscopy was used to confirm the Pt nanoparticle distribution along the walls of the CNTs.