Deposition of particulate-free thin films by two synchronised laser sources: effects of ambient gas pressure and laser fluence

2004 ◽  
Vol 446 (2) ◽  
pp. 178-183 ◽  
Author(s):  
E. György ◽  
I.N. Mihailescu ◽  
M. Kompitsas ◽  
A. Giannoudakos
Keyword(s):  
Thin Films ◽  
Laser Fluence ◽  
Gas Pressure ◽  
Laser Sources ◽  
Ambient Gas

Effect of laser fluence and ambient gas pressure on surface morphology and chemical composition of hydroxyapatite thin films deposited using pulsed laser deposition

2018 ◽  
Vol 427 ◽  
pp. 458-463 ◽  
Author(s):  
Hiroaki Nishikawa ◽  
Tsukasa Hasegawa ◽  
Akiko Miyake ◽  
Yuichiro Tashiro ◽  
Satoshi Komasa ◽  
...  
Keyword(s):  
Thin Films ◽  
Chemical Composition ◽  
Surface Morphology ◽  
Pulsed Laser Deposition ◽  
Laser Fluence ◽  
Pulsed Laser ◽  
Gas Pressure ◽  
Laser Deposition ◽  
Ambient Gas

Structural Evolution of Nanostructured YBa2Cu3Ox Thin Films Formed by Pulsed Laser Glancing Angle Deposition

2007 ◽  
Vol 121-123 ◽  
pp. 947-950
Author(s):  
H.H. Wang ◽  
Y.P. Zhao
Keyword(s):  
Thin Films ◽  
Laser Fluence ◽  
Pulsed Laser ◽  
Structural Evolution ◽  
Glancing Angle Deposition ◽  
Ambient Oxygen ◽  
Glancing Angle ◽  
Shadowing Effect ◽  
Ambient Gas ◽  
Angle Deposition

Nano-structured thin films of amorphous YBa2Cu3Ox were prepared by pulsed laser glancing angle deposition. Ambient oxygen pressure and laser fluence have a strong effect on the microstructure of the films. The films exhibit a structural evolution from isolated nanorods, through network of vertical nanocolumns, to nanoparticles fractal with increasing ambient oxygen pressures. Shadowing effect, surface diffusion and flux scattering by ambient gas play main roles in determining the structural evolution.

Dynamics of Laser Ablation and Vaporization of PbZr0.54Ti0.66O3: Laser Fluence and Ambient Gas Effects

1991 ◽  
Vol 243 ◽  
Author(s):  
R.E. Leuchtner ◽  
J.S. Horwitz ◽  
D.B. Chrisey
Keyword(s):  
Laser Fluence ◽  
Direct Evidence ◽  
Gas Pressure ◽  
Laser Vaporization ◽  
Reaction Cell ◽  
First Order ◽  
Scattering Rate ◽  
Ambient Gas ◽  
Reactive Gases ◽  
Background Gas

AbstractA systematic study of the gas phase products observed from the pulsed laser vaporization of a PbZro.54Ti0.46O3 target was performed as a function of laser fluence and ambient gas pressure. At low fluences, ≤0.3 J/cm2, only Pb and PbO were observed, while at higher fluences, between 0.3 - 1.3 J/cm2, neutral atomic species Pb, Zr, and Ti were detected. Small oxide molecules and atomicions were also observed. These regimes are associated with two ejection mechanisms: thermal evaporation and ablation, respectively. No direct evidence of chemical reactions was found over the gas pressure range explored (0-5 mTorr). Within the 25 cm reaction cell distance however, the addition of both inert and reactive gases greatly changed the velocity distributions of the ejected species. The decrease in velocity (energy) as a function of gas pressure was due to physical scattering and could be modeled as a pseudo-first order bimolecular collision process. The scattering rate increased linearly with the physical cross-section of the background gas and was independent of the kinetic energy of the ablated species.

scholarly journals Effect of Ar Gas Pressure on LSPR Property of Au Nanoparticles: Comparison of Experimental and Theoretical Studies

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1071
Author(s):  
Serap Yiğit Gezgin ◽  
Abdullah Kepceoğlu ◽  
Yasemin Gündoğdu ◽  
Sidiki Zongo ◽  
Anna Zawadzka ◽  
...  
Keyword(s):  
Thin Films ◽  
Near Infrared ◽  
Au Nanoparticles ◽  
Wavelength Region ◽  
Gas Pressure ◽  
Nano Particles ◽  
Au Nanoparticle ◽  
Localized Surface Plasmon ◽  
Ambient Gas ◽  
Ar Gas

In this study, the thin films were produced by using pulsed laser deposition (PLD) technique from gold (Au) nanoparticles deposited on two kinds of substrates under different argon (Ar) gas pressure. Microscope glass slides and silicon (100) wafers were used as amorphous and crystal substrates. The films were deposited under 2 × 10−3 mbar, 1 × 10−2 mbar, 2 × 10−2 mbar argon (Ar) ambient gas pressure. Effect of the background gas pressure on the plasma plume of the ablated Au nanoparticles was investigated in details. Morphology of Au nanoparticle thin films was investigated by means of atomic force microscopy (AFM) technique. Absorption spectra of Au nanoparticles were examined by using UV-Vis spectrometry. Extinction spectra of Au nanoparticles were calculated by using metallic nano particles boundary element method (MNPBEM) simulation programme. Both experimental spectra and simulation data for Au nanoparticles were obtained and compared in this work. It was concluded that they are also in good agreement with literature data. The measurements and the simulation results showed that localized surface plasmon resonance (LSPR) peaks for Au nanoparticles were located in the near infrared region (NIR) because of the larger size of the disk-like shape of Au nanoparticles, and the near-field coupling between Au nanoparticles. It was demonstrated that as the ambient gas (Ar) pressure was increased, the size and the density of Au nanoparticles on the substrate were decreased and the LSPR peak shifts toward the short wavelength region in the spectrum. This shift has been explained by the changes in the morphology of produced thin films.

Effect of Ambient Gas Pressure on the Preferred Orientation of Barium Titanate Thin Films Prepared by Pulsed Laser Deposition

1995 ◽  
Vol 34 (Part 2, No. 11B) ◽  
pp. L1564-L1566 ◽  
Author(s):  
Dong-Young Kim ◽  
Soon-Gul Lee ◽  
YongKiPark ◽  
Soon Ja Park
Keyword(s):  
Thin Films ◽  
Barium Titanate ◽  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
Preferred Orientation ◽  
Gas Pressure ◽  
Laser Deposition ◽  
Ambient Gas

Microstructure Evolution of Epitaxial (Ba, Sr) TiO3/ (001) HgO Thin Films

1994 ◽  
Vol 361 ◽  
Author(s):  
V.A. Alyoshin ◽  
E.V. Sviridov ◽  
V.I.M. Hukhortov ◽  
I.H. Zakharchenko ◽  
V.P. Dudkevich
Keyword(s):  
Thin Films ◽  
Cross Section ◽  
Microstructure Evolution ◽  
Three Dimensional ◽  
Gas Pressure ◽  
Smooth Surfaces ◽  
Two Dimensional ◽  
Surface Versus ◽  
Deposition Conditions

ABSTRACTSurface and cross-section relief evolution of ferroelectric epitaxial (Ba,Sr)TiO3 films rf-sputtered on (001) HgO crystal cle-avage surface versus the oxygen worKing gas pressure P and subst-rate temperature T were studied. Specific features of both three-dimensional and two-dimensional epitaxy mechanisms corresponding to various deposition conditions were revealed. Difference between low and high P-T-value 3D epitaxy was established. The deposition of films with mirror-smooth surfaces and perfect interfaces is shown to be possible.

Experimental and theoretical study of the characteristics of LSPR peaks for metal NPs produced by controlling Ar ambient gas pressure to enhance the efficiency of solar cells

2021 ◽  
pp. 1-6
Author(s):  
Serap Yiğit Gezgin ◽  
Abdullah Kepceoğlu ◽  
Hamdi Şükür Kiliç
Keyword(s):  
Metal Nanoparticles ◽  
Ag Nanoparticles ◽  
Solar Spectrum ◽  
Wavelength Region ◽  
Gas Pressure ◽  
Metal Nanoparticle ◽  
Ag Nanoparticle ◽  
Extinction Cross Section ◽  
Ambient Gas ◽  
Ar Gas

In this study, silver (Ag) nanoparticle thin films were deposited on microscope slide glass and Si wafer substrates using the pulsed-laser deposition (PLD) technique in Ar ambient gas pressures of 1 × 10−3 and 7.5 × 10−1 mbar. AFM analysis has shown that the number of Ag nanoparticles reaching the substrate decreased with increasing Ar gas pressure. As a result of Ar ambient gas being allowed into the vacuum chamber, it was observed that the size and height of Ag nanoparticles decreased and the interparticle distances decreased. According to the absorption spectra taken by a UV–vis spectrometer, the wavelength where the localised surface plasmon resonance (LSPR) peak appeared was shifted towards the longer wavelength region in the solar spectrum as Ar background gas pressure was decreased. This experiment shows that LSPR wavelength can be tuned by adjusting the size of metal nanoparticles, which can be controlled by changing Ar gas pressure. The obtained extinction cross section spectra for Ag nanoparticle thin film was theoretically analysed and determined by using the metal nanoparticle–boundary element method (MNPBEM) toolbox simulation program. In this study, experimental spectrum and simulation data for metal nanoparticles were acquired, compared, and determined to be in agreement.

scholarly journals Effect of Ar Gas Pressure on Mechanical Properties of Sputtered Ti Thin Films

2005 ◽  
Vol 125 (7) ◽  
pp. 313-318 ◽  
Author(s):  
Hirofumi Ogawa ◽  
Shinji Kaneko ◽  
Kiyoteru Suzuki ◽  
Ryutaro Maeda
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Gas Pressure ◽  
Ar Gas

scholarly journals Spinel oxides thin films for write-once optical recording with blue laser sources

2002 ◽  
Vol 2 (4) ◽  
pp. 198-201 ◽  
Author(s):  
Philippe Tailhades ◽  
Lionel Presmanes ◽  
Isabelle Pasquet ◽  
Corine Bonningue ◽  
Fabien Laporte
Keyword(s):  
Thin Films ◽  
Optical Recording ◽  
Blue Laser ◽  
Spinel Oxides ◽  
Laser Sources
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