Heterometal nanoparticles from Ru-based molecular clusters covalently anchored onto functionalized carbon nanotubes and nanofibers

Beilstein Journal of Nanotechnology

Pietro Moggi¹  Xiaoxing Ke²  Gustaaf Van Tendeloo²  Claude Poleunis³  Arnaud Delcorte³  Deborah Vidick⁴  Michel Devillers⁴  Sophie Hermans⁴ 

[1] Dipartimento di Chimica, Università di Parma, Parco Area delle Scienze 17/A, 43124 Parma, Italy;EMAT (Electron Microscopy for Materials Science), University of Antwerp, Groenenborgerlaan 171, B2020 Antwerpen, Belgium;Institute of Condensed Matter and Nanosciences (IMCN), Université catholique de Louvain, Croix du Sud 1, B-1348 Louvain-la-Neuve, Belgium,;Institute of Condensed Matter and Nanosciences (IMCN), Université catholique de Louvain, Place Louis Pasteur 1/3, B-1348 Louvain-la-Neuve, Belgium;

关键词: ammonia synthesis;    cluster;    nanofibers;    nanoparticles;    nanotubes;   

DOI  :  10.3762/bjnano.6.133

来源: DOAJ

【 摘 要 】

Heterometal clusters containing Ru and Au, Co and/or Pt are anchored onto carbon nanotubes and nanofibers functionalized with chelating phosphine groups. The cluster anchoring yield is related to the amount of phosphine groups available on the nanocarbon surface. The ligands of the anchored molecular species are then removed by gentle thermal treatment in order to form nanoparticles. In the case of Au-containing clusters, removal of gold atoms from the clusters and agglomeration leads to a bimodal distribution of nanoparticles at the nanocarbon surface. In the case of Ru–Pt species, anchoring occurs without reorganization through a ligand exchange mechanism. After thermal treatment, ultrasmall (1–3 nm) bimetal Ru–Pt nanoparticles are formed on the surface of the nanocarbons. Characterization by high resolution transmission electron microscopy (HRTEM) and high angle annular dark field scanning transmission electron microscopy (HAADF-STEM) confirms their bimetal nature on the nanoscale. The obtained bimetal nanoparticles supported on nanocarbon were tested as catalysts in ammonia synthesis and are shown to be active at low temperature and atmospheric pressure with very low Ru loading.

【 授权许可】

Unknown