Artificially nanostructured Cu:Al 2 O 3 films produced by pulsed laser deposition

Serna, Rosalía; Afonso, Carmen N.; Ricolleau, C.; Wang, Y.; Zheng, Yu; Gandais, M.; Vickridge, I.

doi:10.1007/s003390000619

Cited by 26 publications

(24 citation statements)

References 2 publications

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“…Once the NPs were produced, the matrix target was ablated to first fill in the space around the NPs and second to produce an a-Al 2 O 3 layer with a certain thickness and a flat surface. 8 This sequence was repeated the desired number of NPs layers and an a-Al 2 O 3 protective layer was always deposited to encase the films. Further details of the synthesis procedure of these nanocomposite films can be found elsewhere.…”

Section: Methodsmentioning

confidence: 99%

“…8 A 2.0 MeV 4 He + beam was used and the experimental spectra were analyzed using the RUMP code, the error in the determination of the gold content being 2%.…”

Section: Methodsmentioning

confidence: 99%

“…7 An alternate PLD technique using independent targets for the metal and the host has successfully been used to produce metal NPs layers embedded in amorphous ͑a-͒Al 2 O 3 with an excellent control over the in-depth separation of the NPs. 8 The dimensions of the NPs are typically controlled through the number of pulses on the metal target leading to quasispherical small NPs ͑diameters of 2-3 nm͒, with a narrow size dispersion ͑around 1 nm͒ for low metal contents. The size and shape dispersion are found to increase as the metal content increased, and the NPs become larger and elongated as a result of coalescence and coarsening.…”

Section: Introductionmentioning

confidence: 99%

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Competing processes during the production of metal nanoparticles by pulsed laser deposition

et al. 2005

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In this work we report on the competition between growth, implantation, and sputtering effects during the production of metal nanoparticles ͑NPs͒ by pulsed laser deposition. The production sequence involves first the deposition of an amorphous ͑a-͒Al 2 O 3 layer onto which gold NPs are produced. They are subsequently covered by a-Al 2 O 3 and this sequence is repeated five times. The resulting nanocomposite films have metal contents per layer in a broad range: 1 -9 ϫ 10 15 at cm −2 . The results clearly show the formation of two NP layers per layer of gold deposited, the deepest one consisting of NPs produced by metal implanted into the a-Al 2 O 3 layer, which is acting as a substrate, and the other one consisting of NPs grown on the a-Al 2 O 3 surface. The high kinetic energy of a significant fraction of the Au species present in the plasma and the high fluxes ͑1016 -10 18 at cm −2 s −1 ͒ at the substrate plays an essential role in the nucleation and growth of the NPs. The competition between surface growth and sputtering at high fluence induces a self-regulation of the NP dimensions that narrows the size distributions.

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Section: Methodsmentioning

confidence: 99%

“…8 A 2.0 MeV 4 He + beam was used and the experimental spectra were analyzed using the RUMP code, the error in the determination of the gold content being 2%.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Competing processes during the production of metal nanoparticles by pulsed laser deposition

et al. 2005

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“…In the as-produced NPs, this height is most likely smaller than the average in-plane diameter according to earlier reports on different metallic NPs produced by alternate PLD under similar conditions. [13][14][15] However, this situation can change after laser-induced melting and solidification since these processes tend to reduce the surface energy and spheres are the most favorable geometry. This reasoning is consistent with the fact that while the average numbers of atoms determined by RBS and average in-plane dimensions do not change significantly upon irradiation, the number density is reduced.…”

Section: Discussionmentioning

confidence: 99%

“…The NPs studied in this work are produced by pulsed laser deposition ͑PLD͒ and thus by nucleation and diffusion at the substrate following the VolmerWeber growth. 13 This method leads to sharp distributions of quasispherical NPs for low metal contents ͑ഛ5 ϫ 10 15 at. cm −2 ͒ and to irregularly shaped NPs due to coarsa͒ Author to whom correspondence should be addressed; FAX: ϩ34-91-5645557; electronic mail: v.resta@io.cfmac.csic.es ening and coalescence for higher values ͑ജ6 ϫ 10 15 at.…”

Section: Introductionmentioning

confidence: 99%

Sharpening the shape distribution of gold nanoparticles by laser irradiation

Resta

Siegel

Bonse

et al. 2006

Journal of Applied Physics

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This work reports on the optical response and morphological changes of gold nanoparticles ͑NPs͒ induced by laser irradiation with single nanosecond laser pulses of different fluences and wavelengths. The as-grown specimens consist of irregularly shaped NPs ͑10-13 nm in average dimensions͒ produced by pulsed laser deposition on a substrate. They exhibit a broad optical absorption band related to the surface plasmon resonance ͑SPR͒ peaking in the range of 634-685 nm. After irradiation with fluences above a threshold value, a blueshift, a decrease of the overall absorption, and a narrowing of the SPR band are observed. The SPR peak wavelength and amplitude after irradiation at increasing fluences reach an approximately constant value, irrespective of the irradiation wavelength. This value is consistent with a homogeneous distribution of spherical gold NPs with a mean diameter close to the average initial dimensions as determined by transmission electron microscopy. The results demonstrate that the conversion of irregularly shaped NPs into spherical NPs with reduced dimension dispersion is a thermally driven process and occurs within a fluence interval defined by the melting threshold of all NPs and the ablation threshold. Whereas the useful fluence interval is controlled by the effective fluence absorbed, that is dependent on the laser wavelength and thermal properties of the substrate, the final shape and dimensions of the NPs are independent of the irradiation wavelength provided the fluence is within this useful interval.

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