Synthesis and laser processing of ZnO nanocrystalline thin films

Ozerov, Igor; Nelson, D. K.; Bulgakov, Alexander V.; Marine, W.; Sentís, M.

doi:10.1016/s0169-4332(03)00100-4

Cited by 60 publications

(53 citation statements)

References 5 publications

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“…A detailed description of growth apparatus and structural characterizations is published earlier. 14 Both transmission and photoluminescence spectra demonstrated high optical quality of ZnO nanoparticles. The fundamental absorption close to the edge at 392 nm and exciton peak position were detected at 3.29 eV.…”

Section: Two-photon Pumped Random Laser In Nanocrystalline Znomentioning

confidence: 96%

Two-photon pumped random laser in nanocrystalline ZnO

Chelnokov

Bityurin

Ozerov

et al. 2006

Applied Physics Letters

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International audienceThin film of ZnO nanoparticles with dimension of about 5–10 nm were fabricated by the pulsed laser ablation method. By using a femtosecond laser beam at 700 nm to pump micrometer-thick films the authors observed two-photon-induced lasing at 385 nm. Experimentally obtained dependence of the threshold on the excitation spot radius r0 is closer to (1/r_0^2) than to (1/r_0), thus suggesting efficiency of the feedback by scattering-random lasing. The experimental data on nonlinear transmission of the film at the wavelength of pumping are presented

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Section: Two-photon Pumped Random Laser In Nanocrystalline Znomentioning

confidence: 96%

Two-photon pumped random laser in nanocrystalline ZnO

Chelnokov

Bityurin

Ozerov

et al. 2006

Applied Physics Letters

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“…Recently, we have observed small nanoclusters with composition Zn n O m (with n, m up to 15) by timeof-flight mass-spectrometry [14] in vacuum and in gas at low pressures. The formation of these atomic clusters in laser induced plasma can be considered as the first step in the synthesis of clusters with sizes of several nanometers which are usually deposited on a substrate individually or in form of a thin film [8,9,11]. Despite of numerous reports on laser deposition of nanostructured films, few data are available on the origin of the nanoclusters and on their aggregate state during the transport to the * Electronic address: ozerov@crmcn.univ-mrs.fr † Electronic address: marine@crmcn.univ-mrs.fr substrate.…”

Section: Introductionmentioning

confidence: 99%

Production of gas phase zinc oxide nanoclusters by pulsed laser ablation

Ozerov

Bulgakov

Nelson

et al. 2005

Applied Surface Science

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We present experimental results on the photoluminescence (PL) of gas-suspended zinc oxide nanoclusters prepared during ablation of sintered ZnO targets by a pulsed ArF laser in the presence of oxygen ambient gas. The PL spectra in the UV spectral region correspond to the exciton recombination in the nanoclusters which are crystallized and cooled down to the temperature of the ambient gas in the ablation chamber. The time evolution of the spectra as well as their dependence on the ambient gas pressure are discussed.

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“…15 This has been explained by the melting of the ZnO surface at these fluences. In the same PLD process, photoluminescence observed in the trajectory of the 193 nm laser beam, in a narrow range of laser fluences, is attributed to condensation of ZnO free nanoclusters.…”

Section: A Raman Analysis Of the Laser Induced Changes In The Zno Tamentioning

confidence: 93%

Laser induced effects on ZnO targets upon ablation at 266 and 308nm wavelengths

Jadraque

Domingo

Martı́n

2008

Journal of Applied Physics

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The development of structural changes in ZnO targets, upon laser irradiation at the wavelengths of 266 and 308 nm, is studied by Raman spectroscopy. At the wavelength of 308 nm, oxygen vacancies are found to develop monotonically with increasing laser intensity. At 266 nm, a structural change in the irradiated ZnO targets, possibly related to nanostructuring, is observed above the laser fluence of 0.45 J cm −2 . The different natures of the laser target interaction processes taking place at both wavelengths are investigated through the characterization of the composition and energy distribution of the species ejected in the ablation. The energy of the neutral Zn and Zn 2 present in the ablation at 308 nm shows a smooth dependence on laser fluence which is consistent with the observed smooth development of oxygen vacancies. At 266 nm, the average kinetic energy of the ejected fragments is higher than at 308 nm and changes abruptly with the ablating laser fluence, consistently with the presence of a fluence threshold above which structural transform is observed at this wavelength. The plume shows the same neutral composition ͑Zn, ZnO, and Zn 2 ͒ at both wavelengths but the dependence on fluence of the ratio of neutral atomic Zn to the dimer Zn 2 shows significant differences. From the latter, different temperature regimes can be inferred in the plume generated at both wavelengths. At 266 nm the cationic composition of the plume is mainly stoichiometric whereas at 308 nm ZnO 2͑3͒ H 2͑1͒ + cations have the highest intensity.

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Synthesis and laser processing of ZnO nanocrystalline thin films

Cited by 60 publications

References 5 publications

Two-photon pumped random laser in nanocrystalline ZnO

Two-photon pumped random laser in nanocrystalline ZnO

Production of gas phase zinc oxide nanoclusters by pulsed laser ablation

Laser induced effects on ZnO targets upon ablation at 266 and 308nm wavelengths

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