Pulsed-laser deposition and laser-induced breakdown spectroscopy of functional oxide materials

2010 ◽  
Author(s):  
Johannes D. Pedarnig
Keyword(s):  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Laser Induced Breakdown Spectroscopy ◽  
Oxide Materials ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown

scholarly journals Photoluminescence Response in Carbon Films Deposited by Pulsed Laser Deposition onto GaAs Substrates at Low Vacuum

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
F. Caballero-Briones ◽  
G. Santana ◽  
T. Flores ◽  
L. Ponce
Keyword(s):  
Pulsed Laser Deposition ◽  
Total Duration ◽  
Pulsed Laser ◽  
Pulse Frequency ◽  
Carbon Films ◽  
Laser Deposition ◽  
Maximum Height ◽  
Breakdown Spectroscopy ◽  
Gaas Substrates ◽  
Laser Induced Breakdown

Carbon films were deposited onto GaAs substrates by pulsed laser deposition at low vacuum (10–15 mTorr) from a graphite target. Films were prepared at different number of pulses (1500 to 6000) with fixed fluence (32 J/cm2), target-to-substrate distance, and pulse frequency using a Q:Switched Nd:YAG laser at 1064 nm operating at a frequency of 10 Hz and producing burst-mode pulses with total duration per shot of 49 ns. Films were characterized by optical microscopy, atomic force microscopy, laser induced breakdown spectroscopy, X-ray diffraction, and photoluminescence spectroscopy. Deposited films were visually smooth and adherent but on the other hand evidence of splashing was observed in all the films. Thickness varied linearly with the number of pulses from 8 to 42 μm with maximum height differences around 700 nm. Hexagonal and orthorhombic carbon was found in all the films and there was no evidence of nitrogen or oxygen incorporation during ablation process. Broad photoluminescence bands were observed and, particularly, emission peaks at 475–480 nm, 540–550 nm, 590 nm, and 625 nm. Bands tend to shift to lower wavelength with film thickness, suggesting that luminescence comes from splashed nanostructures influenced by the semiconducting substrate. This particular substrate effect is vanished as thickness of the films increases.

Pre-Ablation Laser Parameters Effect on the Spectral Enhancement of Double Pulsed Laser Induced Breakdown Spectroscopy

2013 ◽  
Vol 40 (8) ◽  
pp. 0815003
Author(s):  
高勋 Gao Xun ◽  
邵妍 Shao Yan ◽  
杜闯 Du Chuang ◽  
赵振明 Zhao Zhenming ◽  
郑权 Zheng Quan ◽  
...  
Keyword(s):  
Pulsed Laser ◽  
Laser Induced Breakdown Spectroscopy ◽  
Laser Parameters ◽  
Breakdown Spectroscopy ◽  
Ablation Laser ◽  
Spectral Enhancement ◽  
Laser Induced Breakdown

Analysis of the heavy metals in atmospheric particulate matter using dual-pulsed laser-induced breakdown spectroscopy

2019 ◽  
Vol 48 (10) ◽  
pp. 1005006
Author(s):  
李业秋 Li Yeqiu ◽  
孙成林 Sun Chenglin ◽  
李 倩 Li Qian ◽  
岱 钦 Dai Qin ◽  
乌日娜 Wu Rina ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Particulate Matter ◽  
Pulsed Laser ◽  
Atmospheric Particulate Matter ◽  
Laser Induced Breakdown Spectroscopy ◽  
Atmospheric Particulate ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown

scholarly journals Pulsed Laser Deposition of Bismuth Vanadate Thin Films—The Effect of Oxygen Pressure on the Morphology, Composition, and Photoelectrochemical Performance

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1360
Author(s):  
Konrad Trzciński ◽  
Mariusz Szkoda ◽  
Maria Gazda ◽  
Jakub Karczewski ◽  
Adam Cenian ◽  
...  
Keyword(s):  
Pulsed Laser Deposition ◽  
Oxygen Pressure ◽  
Bulk Heterojunction ◽  
Pulsed Laser ◽  
Target Surface ◽  
Thin Layers ◽  
Bismuth Vanadate ◽  
Laser Deposition ◽  
Photoelectrochemical Performance ◽  
Breakdown Spectroscopy

Thin layers of bismuth vanadate were deposited using the pulsed laser deposition technique on commercially available FTO (fluorine-doped tin oxide) substrates. Films were sputtered from a sintered, monoclinic BiVO4 pellet, acting as the target, under various oxygen pressures (from 0.1 to 2 mbar), while the laser beam was perpendicular to the target surface and parallel to the FTO substrate. The oxygen pressure strongly affects the morphology and the composition of films observed as a Bi:V ratio gradient along the layer deposited on the substrate. Despite BiVO4, two other phases were detected using XRD (X-ray diffraction) and Raman spectroscopy—V2O5 and Bi4V2O11. The V-rich region of the samples deposited under low and intermediate oxygen pressures was covered by V2O5 longitudinal structures protruding from BiVO4 film. Higher oxygen pressure leads to the formation of Bi4V2O11@BiVO4 bulk heterojunction. The presented results suggest that the ablation of the target leads to the plasma formation, where Bi and V containing ions can be spatially separated due to the interactions with oxygen molecules. In order to study the phenomenon more thoroughly, laser-induced breakdown spectroscopy measurements were performed. Then, obtained electrodes were used as photoanodes for photoelectrochemical water splitting. The highest photocurrent was achieved for films deposited under 1 mbar O2 pressure and reached 1 mA cm−2 at about 0.8 V vs Ag/AgCl (3 M KCl). It was shown that V2O5 on the top of BiVO4 decreases its photoactivity, while the presence of a bulk Bi4V2O11@BiVO4 heterojunction is beneficial in water photooxidation.

Pulsed Laser Deposition Deposited Layers of Pseudo-Binary Zinc Oxides and Zinc-Porphyrin for Steel Corrosion Inhibition

CORROSION ◽  
10.5006/3550 ◽  
2020 ◽  
Vol 76 (8) ◽  
pp. 734-741
Author(s):  
Mihaela Birdeanu ◽  
Mirela Vaida ◽  
Aurel Valentin Bîrdeanu ◽  
Eugenia Fagadar-Cosma
Keyword(s):  
Pulsed Laser Deposition ◽  
Inhibition Efficiency ◽  
Pulsed Laser ◽  
Steel Corrosion ◽  
Binary Oxide ◽  
Laser Deposition ◽  
Oxide Materials ◽  
Barrier Effect ◽  
Zinc Porphyrin ◽  
Zinc Oxides

Obtaining of ZnTa2O6 and ZnV2O6 pseudo-binary oxide materials by hydrothermal and coprecipitation methods and of Zn(II) 5-pyridyl-10,15,20-tris-(3,4-di-methoxy-phenyl) porphyrin (ZnPydiMeOPP) are presented. Mixed thin films of pseudo-binary oxide materials and Zn-porphyrin were realized by pulsed laser deposition (PLD) technique on steel disks and corrosion tests in 0.1 M HCl solution were performed. The inhibition efficiency (IE) in all cases containing porphyrin was always higher than 80%. The best IE (84.50%) was obtained for the sandwich structure using the hydrothermally obtained ZnV2O6 oxide as the first layer and the ZnPydiMeOPP porphyrin as the second layer. The mechanism of corrosion protection can be explained by the physical/mechanical barrier effect.

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