X-ray diffraction and x-ray photoelectron spectroscopy study of partially strained SiGe layers produced via excimer laser processing

1997 ◽  
Vol 82 (1) ◽  
pp. 147-154 ◽  
Author(s):  
S. Martelli ◽  
I. Vianey ◽  
R. Larciprete ◽  
E. Borsella ◽  
J. Castro ◽  
...  
Keyword(s):  
Excimer Laser ◽  
Photoelectron Spectroscopy ◽  
Laser Processing ◽  
Spectroscopy Study ◽  
X Ray Diffraction ◽  
X Ray ◽  
Strained Sige

scholarly journals Laser Mixing of Titanium on Silicon Carbide

1989 ◽  
Vol 157 ◽  
Author(s):  
T. R. Jervis ◽  
J-P. Hirvonen ◽  
M. Nastasi ◽  
M. R. Cohen
Keyword(s):  
Silicon Carbide ◽  
Excimer Laser ◽  
Laser Processing ◽  
Surface Region ◽  
Substrate Material ◽  
Laser Surface ◽  
X Ray Diffraction ◽  
Mixing Conditions ◽  
Surface Processing ◽  
X Ray

ABSTRACTWe have used excimer laser surface processing to melt and mix single Ti layers into the surface of polycrystalline SiC substrates. The mixing of Ti into the surface is very rapid and efficient. Examination of Rutherford backscattering (RBS) data for different mixing conditions shows the formation of a preferred composition at the Ti-substrate interface which propagates from the interface with further mixing. Reconstruction of the RBS spectrum indicates that the composition of the layer is Ti45C37Si18. X-ray diffraction demonstrates the formation of Ti suicides and carbides in the surface region. Profiling of C in both mixed and uncoated samples by 6 MeV He+ scattering demonstrates that laser processing of the SiC does not cause major changes in the stoichiometry of the substrate material.

KrF Excimer Laser Ablation of Human Enamel

2008 ◽  
Vol 587-588 ◽  
pp. 42-46 ◽  
Author(s):  
M. Sivakumar ◽  
Vitor Oliveira ◽  
Rui Vilar ◽  
A.M. Botelho do Rego
Keyword(s):  
Laser Treatment ◽  
Excimer Laser ◽  
Photoelectron Spectroscopy ◽  
X Ray Diffraction ◽  
Structural Water ◽  
X Ray ◽  
Human Enamel ◽  
Excimer Laser Radiation ◽  
Krf Excimer Laser ◽  
Dental Applications

Laser treatment is a promising technique for dental applications such as caries prevention, dental hypersensitivity reduction and improvement of bond strength of restoration materials. In this study the morphological, structural and chemical changes of enamel surface due to treatment with KrF excimer laser radiation were evaluated using scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. For radiation fluences near 1 J/cm², laser processing originates a relatively porous surface due to preferential removal of material in the enamel prism sheaths. Increasing the fluence leads to a relatively flat surface with clear evidence of surface melting. The X-ray diffractograms of both treated and untreated enamel are similar and correspond to hydroxyapatite. The only modification due to the laser treatment is a slight shift of the peaks, probably, due to a loss of the structural water of hydroxyapatite. X-ray photoelectron spectroscopy confirmed that organic matter is removed from the irradiated surface but no significant changes in the mineral phase occur.

X-ray photoelectron spectroscopy study of excimer laser treated alumina films

1998 ◽  
Vol 72 (1) ◽  
pp. 31-33 ◽  
Author(s):  
D. G. Georgiev ◽  
K. Kolev ◽  
L. D. Laude ◽  
B. Mednikarov ◽  
N. Starbov
Keyword(s):  
Excimer Laser ◽  
Photoelectron Spectroscopy ◽  
Spectroscopy Study ◽  
X Ray ◽  
Alumina Films

X-ray diffraction and photoelectron spectroscopy study of swift heavy ion irradiated Mn/p-Si structure

2010 ◽  
Vol 256 (6) ◽  
pp. 1664-1667 ◽  
Author(s):  
M.K. Srivastava ◽  
T. Shripathi ◽  
D.M. Phase ◽  
P.C. Srivastava
Keyword(s):  
Photoelectron Spectroscopy ◽  
Heavy Ion ◽  
Spectroscopy Study ◽  
X Ray Diffraction ◽  
X Ray ◽  
Swift Heavy Ion

Femtosecond Excimer (248 NM) Laser Micro-Machining of Teflon (PTFE)

2001 ◽  
Author(s):  
K. P. Adhi ◽  
R. L. Owings ◽  
T. A. Railkar ◽  
W. D. Brown ◽  
A. P. Malshe
Keyword(s):  
Excimer Laser ◽  
Photoelectron Spectroscopy ◽  
Laser Processing ◽  
Ablation Threshold ◽  
Micro Machining ◽  
X Ray ◽  
Laser Micro Machining ◽  
Edge Quality ◽  
Micrometer Size

Abstract We have investigated, using X-ray photoelectron spectroscopy (XPS), the surface of polyterafluoroethylene (PTFE) films which were subjected to micromachining by femtosecond UV radiation from an excimer laser (KrF: λ = 248 nm, tp ∼ 380 fs) in air ambient. Bulk characterization of processed PTFE films by Fourier transform infrared spectroscopy (FTIR) allowed us to study laser-induced modifications of the material at energy densities below the ablation threshold. No features in the XPS or FTIR spectra indicated incorporation of hydrogen and/or oxygen or the formation of cross-linked networks of carbon, indicating chemically clean processing in contrast to nanosecond excimer laser processing which chemically degrades the surface being machined. Scanning electron microscopy (SEM) of micrometer size microvias indicates mechanically and thermally damage-free processing of PTFE with good edge quality, again in contrast to nanosecond excimer laser processing.

Investigation of the Effect of Uv-Assisted Oxidation and Nitridation of Hafnium Metal Films

2003 ◽  
Vol 780 ◽  
Author(s):  
C. Essary ◽  
V. Craciun ◽  
J. M. Howard ◽  
R. K. Singh
Keyword(s):  
Uv Radiation ◽  
Photoelectron Spectroscopy ◽  
Grazing Angle ◽  
X Ray Diffraction ◽  
Metal Thin Films ◽  
X Ray ◽  
Force Microscopy ◽  
Si Substrates ◽  
Atomic Force ◽  
Silicon Interface

AbstractHf metal thin films were deposited on Si substrates using a pulsed laser deposition technique in vacuum and in ammonia ambients. The films were then oxidized at 400 °C in 300 Torr of O2. Half the samples were oxidized in the presence of ultraviolet (UV) radiation from a Hg lamp array. X-ray photoelectron spectroscopy, atomic force microscopy, and grazing angle X-ray diffraction were used to compare the crystallinity, roughness, and composition of the films. It has been found that UV radiation causes roughening of the films and also promotes crystallization at lower temperatures.Furthermore, increased silicon oxidation at the interface was noted with the UVirradiated samples and was shown to be in the form of a mixed layer using angle-resolved X-ray photoelectron spectroscopy. Incorporation of nitrogen into the film reduces the oxidation of the silicon interface.

scholarly journals α-Cellulose Fibers of Paper-Waste Origin Surface-Modified with Fe3O4 and Thiolated-Chitosan for Efficacious Immobilization of Laccase

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 581
Author(s):  
Gajanan S. Ghodake ◽  
Surendra K. Shinde ◽  
Ganesh D. Saratale ◽  
Rijuta G. Saratale ◽  
Min Kim ◽  
...  
Keyword(s):  
Enzyme Immobilization ◽  
Photoelectron Spectroscopy ◽  
Cellulose Fibers ◽  
Relative Activity ◽  
Significant Activity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Laccase Immobilization ◽  
Surface Modified

The utilization of waste-paper-biomass for extraction of important α-cellulose biopolymer, and modification of extracted α-cellulose for application in enzyme immobilization can be extremely vital for green circular bio-economy. Thus, in this study, α-cellulose fibers were super-magnetized (Fe3O4), grafted with chitosan (CTNs), and thiol (-SH) modified for laccase immobilization. The developed material was characterized by high-resolution transmission electron microscopy (HR-TEM), HR-TEM energy dispersive X-ray spectroscopy (HR-TEM-EDS), X-ray diffraction (XRD), vibrating sample magnetometer (VSM), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FT-IR) analyses. Laccase immobilized on α-Cellulose-Fe3O4-CTNs (α-Cellulose-Fe3O4-CTNs-Laccase) gave significant activity recovery (99.16%) and laccase loading potential (169.36 mg/g). The α-Cellulose-Fe3O4-CTNs-Laccase displayed excellent stabilities for temperature, pH, and storage time. The α-Cellulose-Fe3O4-CTNs-Laccase applied in repeated cycles shown remarkable consistency of activity retention for 10 cycles. After the 10th cycle, α-Cellulose-Fe3O4-CTNs possessed 80.65% relative activity. Furthermore, α-Cellulose-Fe3O4-CTNs-Laccase shown excellent degradation of pharmaceutical contaminant sulfamethoxazole (SMX). The SMX degradation by α-Cellulose-Fe3O4-CTNs-Laccase was found optimum at incubation time (20 h), pH (3), temperatures (30 °C), and shaking conditions (200 rpm). Finally, α-Cellulose-Fe3O4-CTNs-Laccase gave repeated degradation of SMX. Thus, this study presents a novel, waste-derived, highly capable, and super-magnetic nanocomposite for enzyme immobilization applications.

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