OHMIC CONTACTS ON DIAMOND BY R. F. SPUTTERING AND Ti-Au METALLIZATION

2002 ◽  
Vol 16 (06n07) ◽  
pp. 927-931 ◽  
Author(s):  
Y. Y. WANG ◽  
C. M. ZHEN ◽  
Z. J. YAN ◽  
Q. F. GUO ◽  
G. H. CHEN
Keyword(s):  
Photoelectron Spectroscopy ◽  
Ohmic Contacts ◽  
Boron Concentration ◽  
Low Oxygen ◽  
Spectroscopy Analysis ◽  
Post Deposition Annealing ◽  
X Ray ◽  
High Boron ◽  
Low Oxygen Concentration ◽  
Post Deposition

Low resistance ohmic contacts were fabricated on diamond films. A high boron concentration (~1020 cm -3) was obtained on the surface by ion implantation. The initial film of Ti (20nm) followed by Au (100nm) was deposited by r. f. sputtering. I-V measurements showed that the as-deposited contacts were ohmic. Upon annealing, the ohmic characteristics of the contacts were improved significantly. The specific contacts resistivity decreased from 6.2 × 10-3 to 1.2 × 10-6Ω cm 2 as a result of post-deposition annealing. The X-ray photoelectron spectroscopy analysis indicated the formation of titanium carbide at the Ti/diamond interface in the as-deposited and annealed states. A low oxygen concentration was observed.

Investigation on MoS2(1-x)Te2x Mixture Alloy Fabricated by Co-sputtering Deposition

MRS Advances ◽  
2017 ◽  
Vol 2 (29) ◽  
pp. 1557-1562 ◽  
Author(s):  
Y. Hibino ◽  
S. Ishihara ◽  
N. Sawamoto ◽  
T. Ohashi ◽  
K. Matsuura ◽  
...  
Keyword(s):  
Extinction Coefficient ◽  
Photoelectron Spectroscopy ◽  
Room Temperature ◽  
Post Deposition Annealing ◽  
Sputtering Deposition ◽  
X Ray ◽  
Tauc Plot ◽  
Plot Analysis ◽  
Sputtering Power ◽  
Post Deposition

ABSTRACTWe report the synthesis of MoS2(1-x)Te2x by co-sputtering deposition and effect of mixture on its bandgap. The deposition was carried out at room temperature, and the sputtering power on individual MoS2 and MoTe2 targets were varied to obtain films with different compositions. Investigation with X-ray photoelectron spectroscopy confirmed the formation of Mo-Te and Mo-S bonds after post-deposition annealing (PDA), and one of the samples exhibited composition ratio of Mo:S:Te = 1:1.2:0.8 and 1:1.9:0.1 achieving 1:2 ratio of metal to chalcogen. Bandgap of MoS1.2Te0.8 and MoS1.9Te0.1 was evaluated with Tauc plot analysis from the extinction coefficient obtained by spectroscopic ellipsometry measurements. The obtained bandgaps were 1.0 eV and 1.3 eV. The resulting bandgap was lower than that of bulk MoS2 and higher than that of bulk MoTe2 suggesting mixture of both materials was achieved by co-sputtering.

Colossal Magnetoresistance in Thick La0.7Ca0.3MnO3 Films

1995 ◽  
Vol 384 ◽  
Author(s):  
Randolph E. Treece ◽  
P. Dorsey ◽  
M. Rubinstein ◽  
J. M. Byers ◽  
J. S. Horwitz ◽  
...  
Keyword(s):  
Colossal Magnetoresistance ◽  
Single Phase ◽  
Laser Deposition ◽  
Orthorhombic Structure ◽  
X Ray Diffraction ◽  
Post Deposition Annealing ◽  
X Ray ◽  
Mr Effect ◽  
Deposited Films ◽  
Post Deposition

ABSTRACTThick films (0.6 and 2.0 μm) of the colossal magnetoresistance (CMR) material, La0.7Ca0.3MnO3 (LCMO), have been grown by pulsed laser deposition (PLD). The films were grown from single-phase LCMO targets in 100 mTorr 02 pressures and the material deposited on (100) LaAlO3 substrates at deposition temperatures of 800°C. The deposited films were characterized by X-ray diffraction (XRD), magnetic field-dependent resistivity, and Rutherford backscattering spectroscopy (RBS). The LCMO films were shown by XRD to adopt an orthorhombic structure. Brief post-deposition annealing led to ~50,000% and ~12,000% MR effect in the 0.6 μm and 2.0 μm films, respectively.

SiO2 films as heat resistant layers for protection of expandable polystyrene foam from flame torch–induced heat

2017 ◽  
Vol 31 (5) ◽  
pp. 657-667 ◽  
Author(s):  
S Varnagiris ◽  
S Tuckute ◽  
M Lelis ◽  
D Milcius
Keyword(s):  
Heat Resistance ◽  
Photoelectron Spectroscopy ◽  
Silicon Oxide ◽  
Plasma Generator ◽  
Expanded Polystyrene ◽  
Spectroscopy Analysis ◽  
X Ray ◽  
Heat Resistant ◽  
Pulsed Dc ◽  
Gas Atmosphere

Currently, polymeric insulation materials are widely used for energy saving in buildings. Despite of all benefits, these materials are generally sensitive to heat and highly flammable. This work discusses possibility to improve heat resistance of expanded polystyrene (EPS) foam using thin silicon dioxide (SiO2) films deposited by magnetron sputtering technique. In order to increase surface energy and adherence of SiO2 thin films to substrate EPS was plasma pretreated before films’ depositions using pulsed DC plasma generator for 40 s in argon gas. SiO2 formation was done in reactive argon and oxygen gas atmosphere. Laboratory made equipment was used for flame torch–induced heat resistance experiments. Results showed that silicon oxide films remains stable during heat resistance experiments up to 5 s and fully protects polystyrene (PS) substrate. Films are relatively stable for 30 s and 60 s and partially protect PS from melting and ignition. Scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy analysis confirmed that SiO2 layer, which is distributed uniformly on the EPS surface, could work as a good heat resistant material.

Effect of Sodium Metabisulfite on Selective Flotation of Chalcopyrite and Molybdenite

Minerals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1377
Author(s):  
Yuki Semoto ◽  
Gde Pandhe Wisnu Suyantara ◽  
Hajime Miki ◽  
Keiko Sasaki ◽  
Tsuyoshi Hirajima ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Separation Efficiency ◽  
Diesel Oil ◽  
Sodium Metabisulfite ◽  
Depressing Effect ◽  
Spectroscopy Analysis ◽  
X Ray ◽  
Selective Flotation

Sodium metabisulfite (MBS) was used in this study for selective flotation of chalcopyrite and molybdenite. Microflotation tests of single and mixed minerals were performed to assess the floatability of chalcopyrite and molybdenite. The results of microflotation of single minerals showed that MBS treatment significantly depressed the floatability of chalcopyrite and slightly reduced the floatability of molybdenite. The results of microflotation of mixed minerals demonstrated that the MBS treatment could be used as a selective chalcopyrite depressant in the selective flotation of chalcopyrite and molybdenite. Furthermore, the addition of diesel oil or kerosene could significantly improve the separation efficiency of selective flotation of chalcopyrite and molybdenite using MBS treatment. A mechanism based on X-ray photoelectron spectroscopy analysis results is proposed in this study to explain the selective depressing effect of MBS on the flotation of chalcopyrite and molybdenite.

scholarly journals Structural and chemical comparison between moderately oxygenated and edge oxygenated graphene: mechanical, electrical and thermal performance of the epoxy nanocomposites

2019 ◽  
Vol 1 (10) ◽  
Author(s):  
Orestis Vryonis ◽  
Thomas Andritsch ◽  
Alun S. Vaughan ◽  
Paul L. Lewin
Keyword(s):  
Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
Filler Content ◽  
Structural Characteristics ◽  
Structural Components ◽  
Low Oxygen ◽  
Intrinsic Conductivity ◽  
X Ray ◽  
Conductivity Increase ◽  
Thermal Conductivity Increase

Abstract Two different graphitic powders, namely: moderately-oxidized graphene oxide (mGO) synthesized via a chromium-based technique and a commercial edge-oxidized graphene oxide (eGO), were characterized and incorporated into an epoxy resin, suitable for wind turbine blade structural components. Raman spectroscopy, X-ray photoelectron spectroscopy and thermogravimetric analysis revealed low oxygen content, but divergent structural characteristics for both powders confirming the increased basal-plane functionality of mGO compared to the peripherally decorated eGO. It is also shown that the eGO, displays carbon-based impurities. The inclusion of mGO, into the epoxy resulted in an initial glass transition temperature (Tg) increase (~ 5 °C at 4.4 vol.% mGO) but thereafter Tg decreased sharply. On the contrary, the inclusion of eGO resulted only in a progressive Tg increase. Introduction of just 1 vol.% of eGO deteriorated the tensile strength (~ 15% reduction) of the epoxy, while the strength of the mGO-filled samples was retained. Inclusion of mGO results in a percolation threshold (increase from 4.6 × 10−16 to 6 × 10−9 S/cm) at 0.53 vol.%; in contrast, at the same filler content, the eGO-filled systems are characterized by drastically lower conductivity values (3.4 × 10−16 S/cm). Nevertheless, further analysis indicates similar intrinsic conductivity (~ 10−6 S/cm) for the two fillers. Finally, the maximum achieved thermal conductivity increase with mGO was 200% (at 9.13 vol.%) compared with the unfilled epoxy, while the respective increase with eGO was 150% (at 18 vol.%).

scholarly journals X-ray photoelectron spectroscopy analysis as a tool to assess factors influencing magnetic anisotropy type in Co/MgO system with gold interlayer

2018 ◽  
Vol 145 ◽  
pp. 50-53 ◽  
Author(s):  
Iraida N. Demchenko ◽  
Yevgen Syryanyy ◽  
Yevgen Melikhov ◽  
Laurent Nittler ◽  
Leszek Gladczuk ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Photoelectron Spectroscopy ◽  
Spectroscopy Analysis ◽  
X Ray ◽  
Factors Influencing
Sign in / Sign up

Export Citation Format

Share Document