Raman Spectroscopic Study of Ag-, W- and Pd-Ions Implanted Polyimde Films

AbstractA study has been made of the carbon formation in the surface layer of Ag-, W- and Pd-ions implanted polyimide films. The doses of 130 KeV Ag-ions and 190 KeV W-ions ranged from lxlO16 to 5×1017 atoms/cm2. The doses of 100 KeV Pd-ions ranged from 5×1016 to 2×1017 atoms/cm2. The carbon structure in implanted layers was characterized by laser Raman spectroscopy (LRS). Non-implanted polyimide film has very strong intensity of fluorescence, and the intensity of all W-, Ag- and Pd-ions implanted specimens decreases with the increase in dose. The intensity of Raman spectra for both W- and Ag-ions implanted specimens increases with the increase in dose. For Pd-ion implanted specimens, the Raman spectrum of carbon is hardly observed even with a high dose. Raman spectra for W- or Ag-ions implanted specimens with a high dose show that the diamond-like carbon (DLC) exist in the implanted layers. It is found that the DLC structures in the W- and Ag-ions implanted layers have graphite-like and amorphous-like structures, respectively. We propose that transparency carbon structure in implanted layers is generated by Pd-ion implantation. It is concluded that marked DLC formation in surface layer of polyimide films can be caused by Ag- or W-ions implantation except Pd-ion implantation, and carbon structure in implanted layers depends strongly on the implanted elements.

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Dimethylnitrosamine Detection and Measurement Using Laser Raman Spectroscopy

Applied Spectroscopy ◽

10.1366/000370277774464075 ◽

1977 ◽

Vol 31 (6) ◽

pp. 515-518 ◽

Cited By ~ 4

Author(s):

Dwaine M. Thomas

Keyword(s):

Raman Spectroscopy ◽

Raman Spectra ◽

Laser Raman Spectroscopy ◽

Laser Raman ◽

Signal Response

The Raman spectra of various concentrations of dimethylnitrosamine in water have been measured. The lowest concentration detected was 10 mg/l. Instrumental parameters were varied to optimize the signal response.

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Raman Addition Spectroscopy with a Rotating Cell

Applied Spectroscopy ◽

10.1366/000370275774455842 ◽

1975 ◽

Vol 29 (5) ◽

pp. 386-389 ◽

Cited By ~ 19

Author(s):

Arthur K. Covington ◽

Jennifer M. Thain

Keyword(s):

Raman Spectroscopy ◽

Raman Spectra ◽

Relative Intensity ◽

Internal Standard ◽

Laser Raman Spectroscopy ◽

New Technique ◽

Reference Substance ◽

Laser Raman ◽

Intensity Measurements ◽

A New Technique

A new technique is described for obtaining quantitative relative intensity measurements, in the study of solution equilibria by laser-Raman spectroscopy, without the necessity for adding an internal standard to the sample. A rotating cylindrical double cell with separate compartments for sample and reference is used to superimpose the Raman spectra of sample and reference and hence avoid any uncertainties arising from the displacement of the equilibrium by reference substance addition.

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High-Dose Titanium Ion Implantation into Epitaxial Si/3C-SiC/Si Layer Systems for Electrical Contact Formation

MRS Proceedings ◽

10.1557/proc-622-t8.4.1 ◽

2000 ◽

Vol 622 ◽

Cited By ~ 1

Author(s):

Jörg K.N. Lindner ◽

Stephanie Wenzel ◽

Bernd Stritzker

Keyword(s):

Surface Layer ◽

Solid State ◽

Ion Implantation ◽

Silicon Substrate ◽

Ion Beam ◽

Electrical Contact ◽

Titanium Silicide ◽

Solid State Reactions ◽

High Dose ◽

Homogeneous Surface

ABSTRACTHigh-dose titanium implantations have been performed into ion beam synthesized heteroepitaxial layer systems of Si/3C-SiC/Si(100) in order to study the formation of titanium silicide layers in the silicon top layer. The structure and composition of layers was analysed using RBS, XRD, XTEM and EFTEM. The sputtering rates of 180 keV Ti ions were determined using the lower SiC/Si interface as a marker. A homogeneous surface layer with the stoichiometry of TiSi2 was formed by a nearly stoichiometric implantation and subsequent annealing. The formation of more metal-rich silicides was observed at doses where the peak Ti concentration largely exceeds the TiSi2 stoichiometry and where the total amount of Ti atoms in the top layer is greater than the amount needed to convert the entire Si top layer into TiSi2. Under these conditions, strong solid state reactions of the implanted Ti atoms with the buried SiC layer and the silicon substrate are observed.

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Raman spectroscopic study of photosensitive damage to lysozyme structure sensitized by hypocrellin A

Spectroscopy An International Journal ◽

10.1155/2006/152816 ◽

2006 ◽

Vol 20 (5-6) ◽

pp. 269-273 ◽

Cited By ~ 4

Author(s):

J. H. Zhou ◽

X. H. Wu ◽

S. H. Wei ◽

X. T. Gu ◽

Y. Y. Feng ◽

...

Keyword(s):

Raman Spectroscopy ◽

Main Chain ◽

Molecular Level ◽

Active Oxygen ◽

Laser Raman Spectroscopy ◽

Side Chain ◽

Raman Spectroscopic ◽

Laser Raman ◽

Raman Spectroscopic Study ◽

Hypocrellin A

Laser Raman spectroscopy was used to detect the nature of the structural change in lysozyme sensitized by hypocrellin A (HA) at the molecular level. The results indicated that the orderly structure of lysozyme has been damaged by the active oxygen (1O2, O2−·and.OH, etc.) generated by HA, and cause the changes in H-bonds system of the main chain and the side chain of lysozyme.

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Raman spectroscopy and electrochemistry of water-soluble porphyrins at a silver electrode

Canadian Journal of Chemistry ◽

10.1139/v90-124 ◽

1990 ◽

Vol 68 (5) ◽

pp. 787-790 ◽

Cited By ~ 2

Author(s):

Hideo Orita ◽

Masao Shimizu ◽

Chizuko Nishihara ◽

Takashi Hayakawa ◽

Katsuomi Takehira

Keyword(s):

Aqueous Solution ◽

Raman Spectroscopy ◽

Raman Spectra ◽

Metal Cations ◽

Silver Electrode ◽

Water Soluble ◽

Laser Raman Spectroscopy ◽

Cyclic Voltammograms ◽

Porphyrin Ring ◽

Laser Raman

Cyclic voltammetry and laser Raman spectroscopy were applied to investigate insitu the properties and structures of metal meso-tetrakis (p-sulfonatophenyl)porphyrins (MeTPPS, Me = Co, Fe, Mn, Cu, Ni) adsorbed on a silver electrode in 0.05 M H2SO4 aqueous solution. The cyclic voltammograms for O2 reduction were investigated by changing the metal cations in the porphyrin ring. Among the porphyrins examined, only CoTPPS shows catalytic behavior for O2 electrochemical reduction. The Raman spectra of MeTPPS in aqueous solution are very similar to those of metal tetraphenylporphyrins (MeTPP), and the band assignments were carried out on the basis of the results for [FeTPP]2O. The Raman spectra of MeTPPS on a silver electrode were measured under a N2 or O2 atmosphere, changing the applied potentials and the metal cations in the porphyrin ring. Their spectra are very sensitive to metal cations, but not so to applied potential. Keywords: porphyrin, SERS, electrochemistry, dioxygen, silver electrode.

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Supramolecular structures formed by the self assembly of ionic fullerenes in binary liquid mixtures

Journal of Materials Research ◽

10.1557/jmr.2007.0405 ◽

2007 ◽

Vol 22 (11) ◽

pp. 3029-3035 ◽

Cited By ~ 1

Author(s):

Tohru Shiga ◽

Tomoyoshi Motohiro

Keyword(s):

Self Assembly ◽

Liquid Mixtures ◽

Binary Liquid Mixtures ◽

Supramolecular Structures ◽

The Self ◽

Laser Raman Spectroscopy ◽

Raman Spectroscopic ◽

Laser Raman ◽

Binary Liquid ◽

Unit Cells

The self assembly of C60-N, N′-dimethylpyrrolidinium iodide (C60-DMePyI) in binary liquid mixtures has been investigated. C60-DMePyI self-organized into nanosheets in a mixture of toluene and iodomethane, and aggregated to form nanofibers in toluene. The dimensions of the nanosheets were several micrometers in length and about 100 nm in thickness. Scanning electron microscope observations indicated that a large number of nanorods having a diameter of about 20-nm formed matted nanosheets. When iodomethane alone was used as a solvent, supramolecular structures such as nanofibers and nanosheets were not produced. Structural analyses of the C60-DMePyI aggregates were carried out by laser Raman spectroscopy and x-ray diffraction (XRD). The Raman spectroscopic results suggested that an ordered chain of successive polyiodine units was formed in all the supramolecular aggregates. The XRD studies showed that the crystal systems of the nanosheets and nanofibers were monoclinic, though with different unit cells.

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Theoretical Fitting of Computer Processed Laser Raman Spectra from Methane- and Propane-Air Flames

Applied Spectroscopy ◽

10.1366/0003702794926218 ◽

1979 ◽

Vol 33 (1) ◽

pp. 41-45 ◽

Cited By ~ 17

Author(s):

David A. Stephenson ◽

Richard J. Blint

Keyword(s):

Raman Spectroscopy ◽

Raman Spectra ◽

Computer Processing ◽

Laser Raman Spectroscopy ◽

Laser Raman ◽

Rapid Acquisition ◽

Laser Raman Spectra ◽

Premixed Laminar ◽

Primary Measure

A technique for rapid acquisition and computer processing of Raman signals is described for probing premixed laminar hydrocarbon-air flames using laser Raman spectroscopy. Temperatures can be determined to within ±50°K by fitting the observed N2 spectrum at any point in the flame. Fits to the spectra of O2, CO, H2, and CO2 are used to measure their mole fractions at the calculated N2 temperature. For the remaining polyatomic species, the total area under the peak is the primary measure of their concentration.

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Raman Spectroscopic Observation of Laser-Induced Oxidation of Transition-Metal Borides, Carbides, and Nitrides

Applied Spectroscopy ◽

10.1366/0003702894201914 ◽

1989 ◽

Vol 43 (1) ◽

pp. 134-138 ◽

Cited By ~ 31

Author(s):

G. M. Begun ◽

C. E. Bamberger

Keyword(s):

Raman Spectra ◽

Laser Power ◽

Spectroscopic Observation ◽

Laser Power Density ◽

Oxide Formation ◽

Raman Spectroscopic ◽

Laser Raman ◽

Surface Oxides ◽

Raman Microprobe ◽

Metal Borides

Laser Raman microprobe examination in air of small-particle-sized (powders and whiskers) TiN, TiB2, TiC, WC, ZrN, and NbN revealed the formation of surface oxides, which were induced by laser heating. The rate of oxide formation varied with the particle size of the samples and the laser power density applied. The oxides produced were characterized by their Raman spectra. Thus, the Raman spectra obtained with a microprobe should always be carefully analyzed to ascertain whether oxidation or decomposition of so-called inert materials, especially in powder form, has occurred.

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Azo Dye Tautomeric Structures Determined by Laser-Raman Spectroscopy

Applied Spectroscopy ◽

10.1366/000370277774463201 ◽

1977 ◽

Vol 31 (1) ◽

pp. 30-35 ◽

Cited By ~ 76

Author(s):

P. J. Trotter

Keyword(s):

Raman Spectroscopy ◽

Raman Spectra ◽

Infrared Spectra ◽

Azo Dye ◽

Laser Raman Spectroscopy ◽

Acidic Media ◽

Keto Form ◽

Laser Raman ◽

Aqueous Acid ◽

Tautomeric Forms

Raman spectra of a number of azo dye structures have been analyzed. In azonaphthol and azopyrazol dyes, hydroxyazo to keto-hydrazone tautomerizations, [Formula: see text] were observed in aqueous basic and acidic media. Observations of azo and ring vibrations, as well as hydrazone (C=N plus C=0) bands, were made. It was noted that the azo-anions (examined at pH 12) convert to the protonated neutral hydrazone (keto) form in aqueous acid (run at pH 2). Infrared spectra were used to confirm the presence of the C=0 group in keto-tautomeric forms.

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