Assembly of tantalum porous films with graded oxidation profile from size-selected nanoparticles

Vidyadhar Singh; Panagiotis Grammatikopoulos; Cathal Cassidy; Maria Benelmekki; Murtaza Bohra; Zafer Hawash; Kenneth W. Baughman; Mukhles Sowwan

doi:10.1007/s11051-014-2373-7

Assembly of tantalum porous films with graded oxidation profile from size-selected nanoparticles

Vidyadhar Singh^*, Panagiotis Grammatikopoulos, Cathal Cassidy, Maria Benelmekki, Murtaza Bohra, Zafer Hawash, Kenneth W. Baughman, Mukhles Sowwan

^*Corresponding author for this work

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

25 Scopus citations

Abstract

Functionally graded materials offer a way to improve the physical and chemical properties of thin films and coatings for different applications in the nanotechnology and biomedical fields. In this work, design and assembly of nanoporous tantalum films with a graded oxidation profile perpendicular to the substrate surface are reported. These nanoporous films are composed of size-selected, amorphous tantalum nanoparticles, deposited using a gas-aggregated magnetron sputtering system, and oxidized after coalescence, as samples evolve from mono- to multi-layered structures. Molecular dynamics computer simulations shed light on atomistic mechanisms of nanoparticle coalescence, which govern the films porosity. Aberration-corrected (S) TEM, GIXRD, AFM, SEM, and XPS were employed to study the morphology, phase and oxidation profiles of the tantalum nanoparticles, and the resultant films.

Original language	English
Article number	2373
Journal	Journal of Nanoparticle Research
Volume	16
Issue number	5
DOIs	https://doi.org/10.1007/s11051-014-2373-7
State	Published - May 2014
Externally published	Yes

Keywords

Coalescence
Graded oxidation
Nanoparticles
Nanoporous film
Tantalum
XPS

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10.1007/s11051-014-2373-7

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title = "Assembly of tantalum porous films with graded oxidation profile from size-selected nanoparticles",

abstract = "Functionally graded materials offer a way to improve the physical and chemical properties of thin films and coatings for different applications in the nanotechnology and biomedical fields. In this work, design and assembly of nanoporous tantalum films with a graded oxidation profile perpendicular to the substrate surface are reported. These nanoporous films are composed of size-selected, amorphous tantalum nanoparticles, deposited using a gas-aggregated magnetron sputtering system, and oxidized after coalescence, as samples evolve from mono- to multi-layered structures. Molecular dynamics computer simulations shed light on atomistic mechanisms of nanoparticle coalescence, which govern the films porosity. Aberration-corrected (S) TEM, GIXRD, AFM, SEM, and XPS were employed to study the morphology, phase and oxidation profiles of the tantalum nanoparticles, and the resultant films.",

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author = "Vidyadhar Singh and Panagiotis Grammatikopoulos and Cathal Cassidy and Maria Benelmekki and Murtaza Bohra and Zafer Hawash and Baughman, {Kenneth W.} and Mukhles Sowwan",

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AU - Singh, Vidyadhar

AU - Grammatikopoulos, Panagiotis

AU - Cassidy, Cathal

AU - Benelmekki, Maria

AU - Bohra, Murtaza

AU - Hawash, Zafer

AU - Baughman, Kenneth W.

AU - Sowwan, Mukhles

PY - 2014/5

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N2 - Functionally graded materials offer a way to improve the physical and chemical properties of thin films and coatings for different applications in the nanotechnology and biomedical fields. In this work, design and assembly of nanoporous tantalum films with a graded oxidation profile perpendicular to the substrate surface are reported. These nanoporous films are composed of size-selected, amorphous tantalum nanoparticles, deposited using a gas-aggregated magnetron sputtering system, and oxidized after coalescence, as samples evolve from mono- to multi-layered structures. Molecular dynamics computer simulations shed light on atomistic mechanisms of nanoparticle coalescence, which govern the films porosity. Aberration-corrected (S) TEM, GIXRD, AFM, SEM, and XPS were employed to study the morphology, phase and oxidation profiles of the tantalum nanoparticles, and the resultant films.

AB - Functionally graded materials offer a way to improve the physical and chemical properties of thin films and coatings for different applications in the nanotechnology and biomedical fields. In this work, design and assembly of nanoporous tantalum films with a graded oxidation profile perpendicular to the substrate surface are reported. These nanoporous films are composed of size-selected, amorphous tantalum nanoparticles, deposited using a gas-aggregated magnetron sputtering system, and oxidized after coalescence, as samples evolve from mono- to multi-layered structures. Molecular dynamics computer simulations shed light on atomistic mechanisms of nanoparticle coalescence, which govern the films porosity. Aberration-corrected (S) TEM, GIXRD, AFM, SEM, and XPS were employed to study the morphology, phase and oxidation profiles of the tantalum nanoparticles, and the resultant films.

KW - Coalescence

KW - Graded oxidation

KW - Nanoparticles

KW - Nanoporous film

KW - Tantalum

KW - XPS

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Assembly of tantalum porous films with graded oxidation profile from size-selected nanoparticles

Abstract

Keywords

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