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

Emanuele Cavaliere; Iskandar Kholmanov; Luca Gavioli; Francesco Sedona; Stefano Agnoli; Gaetano Granozzi; Giovanni Barcaro; Alessandro Fortunelli

doi:10.1039/b915641k

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

Emanuele Cavaliere, Iskandar Kholmanov, Luca Gavioli, Francesco Sedona, Stefano Agnoli, Gaetano Granozzi, Giovanni Barcaro, Alessandro Fortunelli

National Research Council of Italy

Research output: Contribution to journal › Article › peer-review

19 Citations (Scopus)

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.

Original language	English
Pages (from-to)	11305-11309
Number of pages	5
Journal	Physical Chemistry Chemical Physics
Volume	11
DOIs	https://doi.org/10.1039/b915641k
Publication status	Published - 2009

Keywords

MEtal nanoparticles
defect mediated assembly, oxides, Oxygen affinity

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10.1039/b915641k

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

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.",

keywords = "MEtal nanoparticles, defect mediated assembly, oxides, Oxygen affinity, MEtal nanoparticles, defect mediated assembly, oxides, Oxygen affinity",

author = "Emanuele Cavaliere and Iskandar Kholmanov and Luca Gavioli and Francesco Sedona and Stefano Agnoli and Gaetano Granozzi and Giovanni Barcaro and Alessandro Fortunelli",

year = "2009",

doi = "10.1039/b915641k",

language = "English",

volume = "11",

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journal = "Physical Chemistry Chemical Physics",

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T1 - Directed assembly of Au and Fe nanoparticles on a TiOx/Pt(111) ultrathin template: the role of oxygen affinity

AU - Cavaliere, Emanuele

AU - Kholmanov, Iskandar

AU - Gavioli, Luca

AU - Sedona, Francesco

AU - Agnoli, Stefano

AU - Granozzi, Gaetano

AU - Barcaro, Giovanni

AU - Fortunelli, Alessandro

PY - 2009

Y1 - 2009

N2 - 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.

AB - 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.

KW - MEtal nanoparticles

KW - defect mediated assembly, oxides, Oxygen affinity

KW - MEtal nanoparticles

KW - defect mediated assembly, oxides, Oxygen affinity

UR - http://hdl.handle.net/10807/4980

U2 - 10.1039/b915641k

DO - 10.1039/b915641k

M3 - Article

SN - 1463-9076

VL - 11

SP - 11305

EP - 11309

JO - Physical Chemistry Chemical Physics

JF - Physical Chemistry Chemical Physics

ER -

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

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Keywords

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