In Situ Roman Studies of Graphite Surface Structures during Lithium Electrochemical Intercalation

1998 ◽  
Vol 145 (3) ◽  
pp. 765-770 ◽  
Author(s):  
Weiwei Huang ◽  
Roger Frech
Keyword(s):  
Graphite Surface ◽  
Surface Structures ◽  
Electrochemical Intercalation

In Situ Raman Scattering Studies of the Electrochemical Intercalation of Graphite in Sulfuric Acid

1982 ◽  
Vol 20 ◽  
Author(s):  
C.H. Olk ◽  
V. Yeh ◽  
F.J. Holler ◽  
P.C. Eklund
Keyword(s):  
Sulfuric Acid ◽  
Raman Scattering ◽  
Electrochemical Synthesis ◽  
High Frequency ◽  
In Situ Raman ◽  
Lower Stage ◽  
Electrochemical Intercalation ◽  
The Moment ◽  
Sudden Transition

ABSTRACTIn situ Raman scattering studies of the high-frequency carbon intralayer modes in graphite-H2SO4 have been carried out during the electrochemical intercalation of graphite in sulfuric acid. The data show that within an optical depth of ∼ 200 Å the entire c-face undergoes a sudden transition to the next lower stage (n−1) at the moment when the bulk has just completed forming stage n. Raman data collected in the “overcharge” and “overoxidation” regimes of the electrochemical synthesis indicate rapid shifting of the peaks during these times, indicating a significant increase in the oxidation of the carbon layers.

Nitrogen bonding, work function and thermal stability of nitrided graphite surface: An in situ XPS, UPS and HREELS study

2020 ◽  
Vol 525 ◽  
pp. 146562 ◽  
Author(s):  
Mohan Kumar Kuntumalla ◽  
Mohammed Attrash ◽  
Rozalia Akhvlediani ◽  
Shaul Michaelson ◽  
Alon Hoffman
Keyword(s):  
Thermal Stability ◽  
Work Function ◽  
Graphite Surface ◽  
In Situ Xps ◽  
Thermal Stability Of

The Effect of Polysilicon Deposition and Doping Processes on Double-Poly Capacitors - Electrical and AFM Evaluation

1993 ◽  
Vol 324 ◽  
Author(s):  
W. M. Paulson ◽  
L. H. Breaux ◽  
R. I. Hegde ◽  
P. J. Tobin
Keyword(s):  
Gas Phase ◽  
Diagnostic Technique ◽  
Surface Structures ◽  
Semiconductor Processing ◽  
Amorphous Films ◽  
Leakage Currents ◽  
Low Leakage ◽  
Oxide Removal ◽  
Non Destructive

AbstractWe have characterized the surface topography of silicon films from different deposition and doping process sequences using AFM and optical reflectivity. The resulting surface structures after deposition, doping, oxide growth, and oxide removal correlate with the electrical leakage currents and breakdown voltages of double polysilicon capacitors. As-deposited amorphous films had smoother surfaces than those deposited in the crystalline state. Gas-phase diffusion doping increases the surface roughness. Only the amorphous in situ doped films retained a smooth surface following oxidation, yielding low leakage capacitors with breakdown fields above 8 MV/cm. Surprisingly, implanted amorphous films exhibited the roughest interfaces, resulting in lower breakdown fields. This study has shown that AFM provides an effective, quick, non-destructive diagnostic technique for semiconductor processing.

Fabrication of spherical Fe-based magnetic powders via the in situ de-wetting of the liquid–solid interface

RSC Advances ◽  
2016 ◽  
Vol 6 (5) ◽  
pp. 3428-3432 ◽  
Author(s):  
Chenglong Lei ◽  
Haifu Huang ◽  
Zhenzhi Cheng ◽  
Shaolong Tang ◽  
Youwei Du
Keyword(s):  
Graphite Surface ◽  
Solid Interface ◽  
Alloy Particles

We developed a new liquid–solid interface method for the fabrication of spherical Fe-based alloy particles, which in situ de-wets from the graphite surface without pores and bulk inclusions.

In Situ Electron Microscopy in catalysis research and related surface reactions

1989 ◽  
Vol 47 ◽  
pp. 614-615
Author(s):  
Pratibha L. Gai
Keyword(s):  
Electron Microscopy ◽  
Operating Conditions ◽  
Surface Structures ◽  
Nanometer Scale ◽  
Direct Observations ◽  
In Situ Electron Microscopy ◽  
Environmental Cell ◽  
Level Information ◽  
Alloy Steels

Catalysis plays a major role in the modern oil and chemical industries. Solid state catalysts are most common, whilst the reactants are commodity gases and liquids. The performance of the catalysts depends strongly on their microstructure, chemistry and surface structures on a fine (nanometer) scale and electron microscopy (EM) plays an increasingly important role in the characterization. In-situ EM with an environmental cell permits direct observations of chemical reactions under near operating conditions and in conjunction with HREM and AEM can provide in favorable cases, significant atomic level information about the surface/microstructural changes and about possible reaction with substrates. In this paper, examples of catalyst materials in chemical technology and the nature of catalysis in alloy steels with applications in nuclear reactors are shown to elucidate this.A variety of supported metallic catalysts were examined: Ni/carbon, Cu/alumina and bimetallic Cu-Pd/C (both of interest in methanol synthesis), Cu-Ru/C (incyclohexane conversions) and Cu-Ni/alumina.

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