Effects of pulsed laser radiation on epitaxial self-assembled Ge quantum dots grown on Si substrates

Pino, A. Pérez del; György, E.; Marcus, I C; Roqueta, Jaume; Alonso, M. I.

doi:10.1088/0957-4484/22/29/295304

Cited by 24 publications

(16 citation statements)

References 47 publications

(58 reference statements)

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“…30,31 The thermophysical parameters of silicon substrate were taken from Ref. 32. Thermal simulations reveal that the laser pulses induce thermal cycles in the MWCNTs about tens to a hundred of ns in duration and with heating-cooling rates which can reach up to 10 12 K/s (Figure 7(b)).…”

Section: Thermal Simulationsmentioning

confidence: 99%

Ultraviolet pulsed laser irradiation of multi-walled carbon nanotubes in nitrogen atmosphere

Pino

György

Cabana

et al. 2014

Journal of Applied Physics

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Laser irradiation of randomly oriented multi-walled carbon nanotube (MWCNT) networks has been carried out using a pulsed Nd:YAG UV laser in nitrogen gas environment. The evolution of the MWCNT morphology and structure as a function of laser fluence and number of accumulated laser pulses has been studied using electron microscopies and Raman spectroscopy. The observed changes are discussed and correlated with thermal simulations. The obtained results indicate that laser irradiation induces very fast, high temperature thermal cycles in MWCNTs which produce the formation of different nanocarbon forms, such as nanodiamonds. Premelting processes have been observed in localized sites by irradiation at low number of laser pulses and low fluence values. The accumulation of laser pulses and the increase in the fluence cause the full melting and amorphization of MWCNTs. The observed structural changes differ from that of conventional high temperature annealing treatments of MWCNTs. V C 2014 AIP Publishing LLC.

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Section: Thermal Simulationsmentioning

confidence: 99%

Ultraviolet pulsed laser irradiation of multi-walled carbon nanotubes in nitrogen atmosphere

Pino

György

Cabana

et al. 2014

Journal of Applied Physics

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“…Laser radiation is characterized by its highly coherent, monochromatic and intense nature, and it can be delivered in very short pulses. Thus, materials submitted to intense laser pulses can suffer significant structural and compositional transformations often out of thermodynamic equilibrium [21][22][23][24][25]. These phase changes can be induced by either high-temperature thermal cycles or by direct photoreactions (or a combination of them).…”

Section: Introductionmentioning

confidence: 99%

Laser-driven coating of vertically aligned carbon nanotubes with manganese oxide from metal organic precursors for energy storage

et al. 2017

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Carbon nanotubes-transition metal oxide systems are intensively studied due to their excellent properties for electrochemical applications. In this work, an innovative procedure is developed for the synthesis of vertically aligned multi-walled carbon nanotubes (VACNTs) coated with transition metal oxide nanostructures. VACNTs are grown by plasma enhanced chemical vapor deposition and coated with a manganese-based metal organic precursor (MOP) film based on manganese acetate solution. Subsequent UV pulsed laser irradiation induces the effective heating-decomposition of the MOP leading to the crystallization of manganese oxide nanostructures on the VACNT surface. The study of the morphology, structure and composition of the synthesized materials shows the formation of randomly oriented MnO crystals, with few nanometers in size, and to their alignment in hundreds of nm long filament-like structures, parallel to the CNT's long axis. Electrochemical measurements reveal a significant increase of the specific capacitance of the MnO-VACNT system (100 F g) as compared to the initial VACNT one (21 F g).

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“…It is widely reported that laser radiation can induce physical and chemical mechanisms in materials, usually coupled between them and far from the thermodynamic equilibrium, provoking phase transitions not achievable with conventional methods. For instance, significant diffusion and even selective melting processes can be induced in nanostructures due to the short and intense laser-induced thermal cycles [29,30]. Moreover, thin films composed of graphene oxide (GO) and GO decorated with TMO NPs have been recently reported to suffer complex structural transformations after their irradiation with nanosecond laser pulses [31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Laser-induced nanostructuration of vertically aligned carbon nanotubes coated with nickel oxide nanoparticles

et al. 2016

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A versatile method is explored to decorate vertically aligned multi-walled carbon nanotubes (VACNTs) with NiO nanostructures. Multi-walled VACNTs are grown by plasma enhanced chemical vapor deposition and coated with NiO nanoparticles (NPs) by drop casting. After that, the system is submitted to nanosecond pulsed UV laser irradiation in atmospheric environment. Laser irradiation provokes rapid heatingmelting-cooling processes which lead to the recrystallization of NiO NPs on the outer walls of VACNTs. In this way, and depending on the laser fluence and the number of accumulated pulses, different nano-architectures such as continuous NiO coatings and spiny features on VACNTs are obtained. High resolution scanning and transmission electron microscopies and Raman spectroscopy, corroborated with photothermal simulations, suggest that the grown nanostructures are mainly created by the laserinduced high temperatures (photothermal mechanisms). However, the observed reconstruction of the outer graphitic shells of VACNTs point to the catalytic action of NiO NPs, probably induced by the direct action of the laser radiation.

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Effects of pulsed laser radiation on epitaxial self-assembled Ge quantum dots grown on Si substrates

Cited by 24 publications

References 47 publications

Ultraviolet pulsed laser irradiation of multi-walled carbon nanotubes in nitrogen atmosphere

Ultraviolet pulsed laser irradiation of multi-walled carbon nanotubes in nitrogen atmosphere

Laser-driven coating of vertically aligned carbon nanotubes with manganese oxide from metal organic precursors for energy storage

Laser-induced nanostructuration of vertically aligned carbon nanotubes coated with nickel oxide nanoparticles

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