Effect of laser power density on the electrochromic properties of WO3 films obtained by pulsed laser deposition

2021 ◽  
Author(s):  
Yunyan Liu ◽  
Ning Jiang ◽  
Yao Liu ◽  
Dawei Cui ◽  
Chang-Feng Yu ◽  
...  
Keyword(s):  
Pulsed Laser Deposition ◽  
Power Density ◽  
Laser Power ◽  
Pulsed Laser ◽  
Laser Power Density ◽  
Laser Deposition ◽  
Electrochromic Properties

Preparation and Microstructure Control of Protein Thin Films Deposited by Pulsed Laser Deposition and Via Colloid Chemical Routes

2003 ◽  
Vol 788 ◽  
Author(s):  
Sayuri Nakayama ◽  
Ichiro Taketani ◽  
Sanshiro Nagare ◽  
Mamoru Senna
Keyword(s):  
Thin Film ◽  
Secondary Structure ◽  
Pulsed Laser Deposition ◽  
Power Density ◽  
Laser Power ◽  
Pulsed Laser ◽  
Laser Power Density ◽  
Laser Deposition ◽  
Random Coil ◽  
Β Sheet

ABSTRACTProtein thin film (mainly silk fibroin) was prepared by pulsed laser deposition (PLD) with 1064nm IR-beam and via colloid chemical routes. Thickness, surface roughness, and microstructures of the deposited film were examined by quartz crystal microbalance sensor, field emission scanning electron microscope (FE-SEM), and atomic force microscope (AFM). The laser power density was varied systematically for PLD to control the microstructures of the film and the secondary structure (β-sheet, α-helix, or random coil) of the protein. Secondary structure of the target and film was examined by FT-IR. Films prepared by PLD comprise by agglomerated particles with their primary particle size around 30nm. The size of the primary particles was uniform, especially for the film prepared at low laser power density. At low laser power density, proportion of β-sheet increased and that of random coil decreased. Proportion of random coil was also increased by the wet colloidal process. PLD with low power density is most suitable to preserve the secondary structure in the protein thin film.

Pulsed Laser Deposition of Diamond-Like Carbon Thin Films: Ablation Dynamics and Growth

1996 ◽  
Vol 438 ◽  
Author(s):  
Peidong Yang ◽  
Z. John Zhang ◽  
Jiangtao Hu ◽  
Charles M. Lieber
Keyword(s):  
Thin Films ◽  
Kinetic Energy ◽  
Pulsed Laser Deposition ◽  
Power Density ◽  
Laser Power ◽  
Large Fraction ◽  
Pulsed Laser ◽  
Laser Power Density ◽  
Laser Deposition ◽  
Diamond Like Carbon

AbstractThin films of diamond-like carbon have been grown by pulsed laser deposition using a Nd:YAG laser at 532 nm. Time-of-flight mass spectroscopy was used to investigate the effects of laser power density and background gas pressure on the plume characteristics including the species in the plume and the kinetic energy distribution of each species. We found that with increasing laser power density (1) the relative amount of C+ ions increases, (2) the kinetic energy distributions of C+ get broader and can be deconvoluted into fast and slow components, and (3) the kinetic energy of the fast component of C+ ions increases from several to 40 eV. The resistivity and the local carbon bonding in films grown under these same conditions were also characterized. It was found that there is direct correlation between the characteristics of fast part of C+ ions in the plume and the diamond-like properties of the thin films. Under optimal growth conditions diamond-like carbon films with a large fraction of sp3 bonding can be prepared, although the maximum fraction appears to saturate at 70%. The implications of these results are discussed.

Experimental Study on Testing Ni-Containing Stainless Steel Protective Coatings by Pulsed Laser Scratching

2010 ◽  
Vol 43 ◽  
pp. 651-656
Author(s):  
Ai Xin Feng ◽  
Yu Peng Cao ◽  
Chuan Chao Xu ◽  
Huai Yang Sun ◽  
Gui Fen Ni ◽  
...  
Keyword(s):  
Residual Stress ◽  
Stainless Steel ◽  
Power Density ◽  
Laser Power ◽  
Protective Coatings ◽  
Three Dimensional ◽  
Pulsed Laser ◽  
Laser Power Density ◽  
The Matrix ◽  
The Impact

In the experiment, we use pulsed laser to conduct discrete scratching on Ni-containing stainless steel protective coatings to test residual stress situation after the matrix is scratched; then to analyze the the impact of the impact stress wave on coating - substrate bonding strength according to the test results, finally to infer the laser power density range within which it occurs coating failure. The study shows that: after laser discrete scratching, the residual stress of the center of the laser-loaded point on matrix surface gradually reduces when the pulsed laser power density increases. The matrix produces a corresponding residual compressive stress under the laser power density reaches a certain value. The actual failure threshold values are 12.006 GW/cm2, 11.829GW/cm2 and 12.193GW/cm2 measured by the three-dimensional topography instrument testing the discrete scratch point of three groups of samples and verified by using a microscope

Electrochromic properties of antimony tin oxide (ATO) thin films synthesized by pulsed laser deposition

2001 ◽  
Vol 46 (13-14) ◽  
pp. 2097-2104 ◽  
Author(s):  
C Marcel ◽  
M.S Hegde ◽  
A Rougier ◽  
C Maugy ◽  
C Guéry ◽  
...  
Keyword(s):  
Thin Films ◽  
Pulsed Laser Deposition ◽  
Tin Oxide ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Electrochromic Properties ◽  
Antimony Tin Oxide

scholarly journals Impact of laser power density on tribological properties of Pulsed Laser Deposited DLC films

AIP Advances ◽  
2013 ◽  
Vol 3 (12) ◽  
pp. 122113 ◽  
Author(s):  
S. Gayathri ◽  
N. Kumar ◽  
R. Krishnan ◽  
S. AmirthaPandian ◽  
T. R. Ravindran ◽  
...  
Keyword(s):  
Power Density ◽  
Tribological Properties ◽  
Laser Power ◽  
Pulsed Laser ◽  
Laser Power Density

High-Tc superconducting NbN films with low particulate density grown at 25 °C using pulsed laser deposition

2001 ◽  
Vol 16 (5) ◽  
pp. 1223-1226 ◽  
Author(s):  
Anupama B. Kaul ◽  
Timothy D. Sands ◽  
Theodore Van Duzer
Keyword(s):  
Pulsed Laser Deposition ◽  
Power Density ◽  
Electrical Transport ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
X Ray Diffraction ◽  
High Tc ◽  
Si Substrates ◽  
High Laser

The growth and characterization of high-Tc NbN films formed on room temperature substrates by pulsed laser deposition is described. The growth was performed at a high laser power density (>5 × 108 W/cm2), where the enhanced reactivity of species in the plume is proposed as the mechanism for increased nitrogen incorporation in films on unheated substrates. The Tcs were 16.2 K on MgO and 13 K on SiNx/Si substrates. In addition to electrical transport measurements, the films were characterized using RBS and x-ray diffraction. The particulate density on films grown at high power density was significantly reduced, which is correlated with the Nb target having a smoother morphology, characteristic of a quenched molten surface layer in the ablated area.

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