Fast Imaging of Laser-induced Plasma Emission from a ZnO Target

Abdelli‐Messaci, S.; Kerdja, T.; Lafane, S.; Malek, S.

doi:10.1016/j.sab.2009.07.039

Cited by 19 publications

(11 citation statements)

References 27 publications

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“…We observe that for temperatures of 550 and 600 • C the lattice constant is quite similar to the ZnO bulk value which suggest that at this temperature range W is forming interstitial impurity, while at high temperatures the lattice constant decreases which would mean that W is now a substitutional and followed by the process of crystallization of the W-ZnO. This observed well oriented nano-structures at these two temperatures could be due to the ad-atom mobility with the energy supplied via substrate heating and the nucleus formed at the substrate surface at the deposition substrates temperatures of 550 and 600 • C ± 25 • C of the transition glass substrate temperature, the nanoparticles which resulted in the condensation in the gas phase [11,12], fuse together to form the small seeds. These seeds then form the centres for the rod growth.…”

Section: Methodsmentioning

confidence: 85%

Temperature-dependent growth mode of W-doped ZnO nanostructures

Ngom

Chaker

Manyala

et al. 2011

Applied Surface Science

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Section: Methodsmentioning

confidence: 85%

Temperature-dependent growth mode of W-doped ZnO nanostructures

Ngom

Chaker

Manyala

et al. 2011

Applied Surface Science

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“…Therefore, the second stage plume will collide with the first stage tail plume, which leads to the lower expansion velocity of the second stage plume. At the same time, the obvious contact edge between the first stage plume and the second stage plume may represent the formation of the shock wave, which is similar to the shock wave formed by the laser plasma moving in the background gas with a certain pressure [28].…”

Section: Plasma Plume Of Laser Ablating Al/ptfementioning

confidence: 99%

A Study on the Plasma Plume Expansion Dynamics of Nanosecond Laser Ablating Al/PTFE

Tan

Wang

et al. 2020

Energies

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To study the plasma plume expansion dynamics of nanosecond laser ablating Al/PTFE, the Al/PTFE propellant was prepared by a molding sintering method and the rapid expansion process of the plasma plume was photographed using fast photography technology. The effects of the proportion of Al, laser energy and ambient pressure on plasma plume expansion dynamics are analyzed. The results show that the plume expansion process of laser ablating Al/PTFE plasma can be divided into three stages and this phenomenon has not been reported in the literature. The Al powder doped in PTFE will block part of the laser transmission into the propellant, thus reducing the laser absorption depth of the propellant. In the case of short pulse laser ablation, the reaction rate between Al and PTFE is optimal when the reductant is slightly higher than the oxidant. As the laser energy increases, the light intensity of the plasma becomes stronger, the plasma size becomes larger and the existence time of plasma becomes longer. In the first stage plume, the plume expands freely at the ambient pressure of 0.005 Pa and the plume expansion distance is linearly related to time, while the shock wave formed at the interface between the plume front and the ambient gas at the ambient pressure of 5 Pa and the expansion can be described by S-T theory.

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Section: Introductionmentioning

confidence: 99%

“…In several works, laser ablation of selected targets like carbon, zinc, titanium, and aluminum has been investigated for vacuum to high-pressure environments in the range of 10 À6 -1000 mbar. [3][4][5][6] The LA mechanisms are strongly dependent on the laser parameters and the nature and pressure of ambient gas, as well as the irradiated target properties. 7,8 Plasma contains species coming from the target surface and the ambient gas as well as molecules and radicals issued from the interaction between plasma species and the environmental atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Atomic and Molecular Species Post-2 μs Dynamics in Laser-Induced Carbon Plasmas in Air

et al. 2020

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Laser-induced carbon plasma in air undergoes various physicochemical processes that affect the kinetic chemistry of species of the plasma plume. We report the time- and space- resolved characterization of carbon plasma produced by infrared nanosecond laser into air at atmospheric pressure. Investigating the laser fluence effect highlights dissociation for fluences > 40 J cm-2, and recombination processes in the fluence range of 10-40 J cm-2. Emission intensities of C2 and CN molecules undergo an enhancement at specific spatiotemporal locations in the laser-induced plasma. At a value of 27 J/cm2 and 0.8 mm from the plasma ignition, molecular band formation is favored for the specific temperature and density values of 1.7E15 cm-3 and 9502 K. The vibrational temperatures of molecules are determined using non-linear spectral data fitting program. The shock front between laser-induced carbon plasma and air may lead to a significant shock wave that affects the occurrence of molecular CN and C2 formation. This can be explained by the distinct temperatures exhibited by CN and C2 molecules with laser fluence. The atomic carbon travels farther to react and form C2, where the ionization-recombination process plays a significant role in its formation. Collisions of C with N neutrals and N2 molecules are the plausible origin of CN generation. Moreover, the density of CN in the plasma depends on C2 molecules.

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Fast Imaging of Laser-induced Plasma Emission from a ZnO Target

Cited by 19 publications

References 27 publications

Temperature-dependent growth mode of W-doped ZnO nanostructures

Temperature-dependent growth mode of W-doped ZnO nanostructures

A Study on the Plasma Plume Expansion Dynamics of Nanosecond Laser Ablating Al/PTFE

Atomic and Molecular Species Post-2 μs Dynamics in Laser-Induced Carbon Plasmas in Air

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