Femtosecond pulsed laser deposition of nanostructured TiO2 films

Sanz, Mikel; Walczak, Malgorzata; Nalda, R. de; Oujja, M.; Marco, José F.; Rodríguez, Javier; Izquierdo, J. G.; Bañares, Luis; Castillejo, Marta

doi:10.1016/j.apsusc.2008.07.148

Cited by 36 publications

(38 citation statements)

References 28 publications

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“…The FH in Al decays faster with ablation energy than the TH, Figure 3 Comparison of the optimum delay values obtained for the metal plumes with those of MgF 2 or NaCl is not possible, as these were not measured using the same ablation wavelength, a parameter that determines the ablation mechanism and therefore has a strong influence on the velocity of the ejected species [21][22][23].…”

Section: Resultsmentioning

confidence: 99%

Generation of low-order harmonics in laser ablation plasmas

et al. 2012

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Third and fifth harmonics of a pulsed infrared laser (1064 nm) delivering pulses of nanosecond duration have been generated in the laser ablation plasmas of various materials including the metals Al and Fe and the highly ionic insulators MgF 2 and NaCl. The harmonics were generated in a process triggered by laser ablation followed by frequencyup-conversion of the fundamental laser beam that propagates parallel to the target surface. The spatial and temporal behaviour of the harmonics reveals the distinctive composition and dynamics of each plasma, gives insight on the species that act as nonlinear media and allows the comparison of different processes that control the generation efficiency. Loworder harmonic generation thus emerges as a powerful and universal technique for monitoring and diagnostics of ablation plasmas while, at the same time, the results presented serve to guide the choice of solid materials for efficient high harmonic generation using ultrashort pulses in the femtosecond regime.

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Section: Resultsmentioning

confidence: 99%

Generation of low-order harmonics in laser ablation plasmas

et al. 2012

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“…The bundled anode also presents an enhanced surface surface area ~1.4 times larger than that for traditional anodes. While others have used PLD [16][17][18][19] to fabricate TiO 2 photoanodes, this pressure control structure might open a path to a marriage of the best properties of random nanoparticle networks with oriented single crystal nanotubes and rods.…”

Section: Introductionmentioning

confidence: 97%

Efficient high surface area vertically aligned metal oxide nanostructures for dye-sensitized photoanodes by pulsed laser deposition

et al. 2011

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Vertically aligned bundles of TiO 2 nanocrystals were fabricated by pulsed laser deposition (PLD) and tested as a photoanode material in dye sensitized solar cells (DSSC) using scanning electron microscopy (SEM), light absorption spectroscopy (UV-Vis), and incident photon-to-current efficiency (IPCE) experiments. An optimal background pressure of oxygen during deposition was discovered to produce a photoanode structure that simultaneously achieves high surface area and improves charge transport for enhanced photoelectrochemical performance. UV-Vis studies show that there is a 1.4x enhancement of surface area for PLD-TiO 2 photoanodes compared to the best sol-gel films. PLD-TiO 2 DSSC IPCE values are comparable to 3x thicker sol-gel films and nearly 92% APCE values have been observed for optimized structures.

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“…[5][6][7] This phenomenon is related to the capability of inducing non-equilibrium, extreme states in the irradiated material whose relaxation dynamics allows the generation of specific thermodynamic conditions during the decomposition stage, [8][9][10] which eventually result in NP formation. [11][12][13][14][15][16][17][18][19] Typically, NPs constitute the major part of the material blowoff produced in ultrashort laser ablation of a metallic target, the atomic plume accounting for only 10%-20% of the total ablated mass. [20][21][22][23] Therefore, ultrafast laser ablation of metals in vacuum is among the most promising prospective techniques for the preparation of NPs and NPs-assembled media.…”

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confidence: 99%

Ultrashort laser ablation of bulk copper targets: Dynamics and size distribution of the generated nanoparticles

Tsakiris

Anoop

Ausanio

et al. 2014

Journal of Applied Physics

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We address the role of laser pulse fluence on expansion dynamics and size distribution of the nanoparticles produced by irradiating a metallic target with an ultrashort laser pulse in a vacuum, an issue for which contrasting indications are present in the literature. To this end, we have carried out a combined theoretical and experimental analysis of laser ablation of a bulk copper target with 50 fs, 800 nm pulses, in an interval of laser fluencies going from few to several times the ablation threshold. On one side, molecular dynamics simulations, with two-temperature model, describe the decomposition of the material through the analysis of the evolution of thermodynamic trajectories in the material phase diagram, and allow estimating the size distribution of the generated nanoaggregates. On the other side, atomic force microscopy of less than one layer nanoparticles deposits on witness plates, and fast imaging of the nanoparticles broadband optical emission provide the corresponding experimental characterization. Both experimental and numerical findings agree on a size distribution characterized by a significant fraction (90%) of small nanoparticles, and a residual part (10%) spanning over a rather large size interval, evidencing a weak dependence of the nanoparticles sizes on the laser pulse fluence. Numerical and experimental findings show a good degree of consistency, thus suggesting that modeling can realistically support the search for experimental methods leading to an improved control over the generation of nanoparticles by ultrashort laser ablation

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Femtosecond pulsed laser deposition of nanostructured TiO2 films

Cited by 36 publications

References 28 publications

Generation of low-order harmonics in laser ablation plasmas

Generation of low-order harmonics in laser ablation plasmas

Efficient high surface area vertically aligned metal oxide nanostructures for dye-sensitized photoanodes by pulsed laser deposition

Ultrashort laser ablation of bulk copper targets: Dynamics and size distribution of the generated nanoparticles

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