The essential role of O affinity in the directed assembly of size-selected Au and Fe nanoparticles (NPs) on a TiOx/Pt(111) ultrathin oxide phase, an effective template for size selected metal NP growth, is revealed through scanning tunneling microscopy and density-functional calculations. A weakly interacting element (Au) diffuses rapidly and gets trapped in the vacancy defects (picoholes) located inside parallel rows (troughs, spaced 1.44 nm apart) peculiar to the film structure, producing size-selected NPs arranged in regular linear arrays aligned along the troughs. In contrast, an element with greater O affinity (Fe) experiences higher diffusion barriers, and the growth is dominated by kinetic effects, with a less effective preferential nucleation and the appearance of irregular NP morphologies.

Cavaliere, E., Kholmanov, I., Gavioli, L., Sedona, F., Agnoli, S., Granozzi, G., Barcaro, G., Fortunelli, A., Directed assembly of Au and Fe nanoparticles on a TiOx/Pt(111) ultrathin template: the role of oxygen affinity, <<PHYSICAL CHEMISTRY CHEMICAL PHYSICS>>, 2009; 11 (47): 11305-11309. [doi:10.1039/b915641k] [http://hdl.handle.net/10807/4980]

Directed assembly of Au and Fe nanoparticles on a TiOx/Pt(111) ultrathin template: the role of oxygen affinity

Cavaliere, Emanuele;Kholmanov, Iskandar;Gavioli, Luca;Sedona, Francesco;Agnoli, Stefano;Granozzi, Gaetano;
2009

Abstract

The essential role of O affinity in the directed assembly of size-selected Au and Fe nanoparticles (NPs) on a TiOx/Pt(111) ultrathin oxide phase, an effective template for size selected metal NP growth, is revealed through scanning tunneling microscopy and density-functional calculations. A weakly interacting element (Au) diffuses rapidly and gets trapped in the vacancy defects (picoholes) located inside parallel rows (troughs, spaced 1.44 nm apart) peculiar to the film structure, producing size-selected NPs arranged in regular linear arrays aligned along the troughs. In contrast, an element with greater O affinity (Fe) experiences higher diffusion barriers, and the growth is dominated by kinetic effects, with a less effective preferential nucleation and the appearance of irregular NP morphologies.
eng
Cavaliere, E., Kholmanov, I., Gavioli, L., Sedona, F., Agnoli, S., Granozzi, G., Barcaro, G., Fortunelli, A., Directed assembly of Au and Fe nanoparticles on a TiOx/Pt(111) ultrathin template: the role of oxygen affinity, <>, 2009; 11 (47): 11305-11309. [doi:10.1039/b915641k] [http://hdl.handle.net/10807/4980]
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10807/4980
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