Articolo in rivista, 2020, ENG, 10.1021/acs.jpcc.9b08684

2D Ni Nanoclusters on Ultrathin MgO/Ag(100)

Savio, Letizia; Smerieri, Marco; Pal, Jagriti; Celasco, Edvige; Rocca, Mario; Vattuonet, Luca

UOS Genova, CNR, IMEM, Via Dodecaneso 33, I-16146 Genoa, Italy; Univ Genoa, Dipartimento Fis, Via Dodecaneso 33, I-16146 Genoa, Italy; Fritz Haber Inst Max Planck Gesell, Faradayweg 4-6, D-14195 Berlin, Germany

Ni nanoclusters up to 30 angstrom in diameter are grown by Ni deposition on ultrathin MgO/Ag(100) films at different temperatures and characterized by combining low-temperature scanning tunneling microscopy with photo-emission and vibrational spectroscopies. At 200 K, both small NixOyD aggregates and 2D Ni nanoparticles of average size close to 12 angstrom form. The latter have a metallic nature and efficiently catalyze CO dissociation at 200 K. When Ni is deposited at 300 K, only larger 3D Ni clusters are observed.

Journal of physical chemistry. C 124 (1), pp. 482–488

Keywords

Ni nanoclusters, reactivity, STM, photoemission spectroscopy

CNR authors

Rocca Mario Agostino, Vattuone Luca, Celasco Edvige, Savio Letizia, Smerieri Marco

CNR institutes

IMEM – Istituto dei materiali per l'elettronica ed il magnetismo