The role of the laser fluence on the Al                         2                         O                         3                          target in the nanostructure and morphology of VO                         x                         :Al                         2                         O                         3                          thin films prepared by pulsed laser deposition

S. Núñez-Sánchez; R. Serna; A. K. Petford-Long; M. Tanase

doi:10.1016/j.apsusc.2007.07.191

The role of the laser fluence on the Al ₂ O ₃ target in the nanostructure and morphology of VO _x :Al ₂ O ₃ thin films prepared by pulsed laser deposition

S. Núñez-Sánchez^*, R. Serna, A. K. Petford-Long, M. Tanase

^*Corresponding author for this work

Materials Science and Engineering

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

3 Scopus citations

Abstract

The role played by the laser fluence on the Al ₂ O ₃ target when depositing VO _x :Al ₂ O ₃ nanocomposite thin films by alternate ablation from ceramic alumina (Al ₂ O ₃ ) and metallic vanadium (V) targets in vacuum has been studied. The fluence and number of pulses on the V target to prepare the nanoparticles has been maintained constant, while the fluence used to grow the Al ₂ O ₃ host has been varied from 1.3 to 3.9 J cm ^-2 . The optical properties of the films, namely in-situ reflectivity during growth and extinction coefficient, evidence that the properties of the nanoparticles change as a function of the laser fluence on the Al ₂ O ₃ host. Transmission electron microscopy analysis shows the formation of vanadium oxide nanoparticles with average diameters in the range of 4.6 nm. Structural analysis of the nanoparticles shows that they are mainly crystalline. Phases of VO _x with average [O]/[V] ratios from 1.7 to 2.2 have been identified with the most commonly observed being V ₃ O ₅ . This is in agreement with low heat of formation of this oxide. It is shown that the oxidation of the nanoparticles induced during the deposition of Al ₂ O ₃ is very efficient since no metallic V nanoparticles are formed even for the lowest fluence used.

Original language	English (US)
Pages (from-to)	1316-1321
Number of pages	6
Journal	Applied Surface Science
Volume	254
Issue number	4
DOIs	https://doi.org/10.1016/j.apsusc.2007.07.191
State	Published - Dec 15 2007

Keywords

Nanoparticles
PLD
Pulsed laser deposition
Vanadium oxide

ASJC Scopus subject areas

Chemistry(all)
Condensed Matter Physics
Physics and Astronomy(all)
Surfaces and Interfaces
Surfaces, Coatings and Films

Access to Document

10.1016/j.apsusc.2007.07.191

Cite this

Núñez-Sánchez, S., Serna, R., Petford-Long, A. K., & Tanase, M. (2007). The role of the laser fluence on the Al ₂ O ₃ target in the nanostructure and morphology of VO _x :Al ₂ O ₃ thin films prepared by pulsed laser deposition Applied Surface Science, 254(4), 1316-1321. https://doi.org/10.1016/j.apsusc.2007.07.191

Núñez-Sánchez, S. ; Serna, R. ; Petford-Long, A. K. et al. / The role of the laser fluence on the Al ₂ O ₃ target in the nanostructure and morphology of VO _x :Al ₂ O ₃ thin films prepared by pulsed laser deposition In: Applied Surface Science. 2007 ; Vol. 254, No. 4. pp. 1316-1321.

@article{58538cc844004543ada218dfe029efc1,

title = " The role of the laser fluence on the Al 2 O 3 target in the nanostructure and morphology of VO x :Al 2 O 3 thin films prepared by pulsed laser deposition ",

abstract = " The role played by the laser fluence on the Al 2 O 3 target when depositing VO x :Al 2 O 3 nanocomposite thin films by alternate ablation from ceramic alumina (Al 2 O 3 ) and metallic vanadium (V) targets in vacuum has been studied. The fluence and number of pulses on the V target to prepare the nanoparticles has been maintained constant, while the fluence used to grow the Al 2 O 3 host has been varied from 1.3 to 3.9 J cm -2 . The optical properties of the films, namely in-situ reflectivity during growth and extinction coefficient, evidence that the properties of the nanoparticles change as a function of the laser fluence on the Al 2 O 3 host. Transmission electron microscopy analysis shows the formation of vanadium oxide nanoparticles with average diameters in the range of 4.6 nm. Structural analysis of the nanoparticles shows that they are mainly crystalline. Phases of VO x with average [O]/[V] ratios from 1.7 to 2.2 have been identified with the most commonly observed being V 3 O 5 . This is in agreement with low heat of formation of this oxide. It is shown that the oxidation of the nanoparticles induced during the deposition of Al 2 O 3 is very efficient since no metallic V nanoparticles are formed even for the lowest fluence used.",

keywords = "Nanoparticles, PLD, Pulsed laser deposition, Vanadium oxide",

author = "S. N{\'u}{\~n}ez-S{\'a}nchez and R. Serna and Petford-Long, {A. K.} and M. Tanase",

note = "Funding Information: We are grateful to R.F. Haglund, Jr. for valuable discussions on the topic of this paper, and for supplying the V target. We would like to thank J. Garc{\'i}a L{\'o}pez (CNA, Spain) for the RBS measurements. This work was partially funded by CICYT (Spain), under MAT2003-01490 and TEC2006-04538 projects. The electron microscopy analysis was performed at Argonne National Laboratory, this facility is supported under contract #DE-AC02-06CH11357 between UChicago Argonne, LLC and the DOE. S. N.-S. acknowledges the Ministerio de Educaci{\'o}n y Ciencia for the support of a FPU grant.",

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Núñez-Sánchez, S, Serna, R, Petford-Long, AK & Tanase, M 2007, ' The role of the laser fluence on the Al ₂ O ₃ target in the nanostructure and morphology of VO _x :Al ₂ O ₃ thin films prepared by pulsed laser deposition ', Applied Surface Science, vol. 254, no. 4, pp. 1316-1321. https://doi.org/10.1016/j.apsusc.2007.07.191

The role of the laser fluence on the Al ₂ O ₃ target in the nanostructure and morphology of VO _x :Al ₂ O ₃ thin films prepared by pulsed laser deposition . / Núñez-Sánchez, S.; Serna, R.; Petford-Long, A. K. et al.

In: Applied Surface Science, Vol. 254, No. 4, 15.12.2007, p. 1316-1321.

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

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AU - Tanase, M.

N1 - Funding Information: We are grateful to R.F. Haglund, Jr. for valuable discussions on the topic of this paper, and for supplying the V target. We would like to thank J. García López (CNA, Spain) for the RBS measurements. This work was partially funded by CICYT (Spain), under MAT2003-01490 and TEC2006-04538 projects. The electron microscopy analysis was performed at Argonne National Laboratory, this facility is supported under contract #DE-AC02-06CH11357 between UChicago Argonne, LLC and the DOE. S. N.-S. acknowledges the Ministerio de Educación y Ciencia for the support of a FPU grant.

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AB - The role played by the laser fluence on the Al 2 O 3 target when depositing VO x :Al 2 O 3 nanocomposite thin films by alternate ablation from ceramic alumina (Al 2 O 3 ) and metallic vanadium (V) targets in vacuum has been studied. The fluence and number of pulses on the V target to prepare the nanoparticles has been maintained constant, while the fluence used to grow the Al 2 O 3 host has been varied from 1.3 to 3.9 J cm -2 . The optical properties of the films, namely in-situ reflectivity during growth and extinction coefficient, evidence that the properties of the nanoparticles change as a function of the laser fluence on the Al 2 O 3 host. Transmission electron microscopy analysis shows the formation of vanadium oxide nanoparticles with average diameters in the range of 4.6 nm. Structural analysis of the nanoparticles shows that they are mainly crystalline. Phases of VO x with average [O]/[V] ratios from 1.7 to 2.2 have been identified with the most commonly observed being V 3 O 5 . This is in agreement with low heat of formation of this oxide. It is shown that the oxidation of the nanoparticles induced during the deposition of Al 2 O 3 is very efficient since no metallic V nanoparticles are formed even for the lowest fluence used.

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Núñez-Sánchez S, Serna R, Petford-Long AK, Tanase M. The role of the laser fluence on the Al ₂ O ₃ target in the nanostructure and morphology of VO _x :Al ₂ O ₃ thin films prepared by pulsed laser deposition Applied Surface Science. 2007 Dec 15;254(4):1316-1321. doi: 10.1016/j.apsusc.2007.07.191