scholarly journals Amorphous Carbon-Induced Surface Defect Repair for Reinforcing the Mechanical Properties of Carbon Fiber

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1244 ◽  
Author(s):  
Dachao Li ◽  
Hongzhong Liu ◽  
Bangdao Chen ◽  
Dong Niu ◽  
Biao Lei ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Raman Spectroscopy ◽  
Tensile Strength ◽  
Graphene Oxide ◽  
Carbon Fiber ◽  
Scanning Tunneling Microscopy ◽  
Amorphous Carbon ◽  
Interfacial Strength ◽  
Scanning Tunneling ◽  
Tunneling Microscopy

Graphene oxide (GO) was prepared using metal-catalyzed crystallization of amorphous carbon on a carbon fiber surface to improve the mechanical properties of the carbon fiber (CF). The deposited GO was used for repairing of surface structure defects on CF, thereby improving the tensile strength and interfacial strength force of CF. The grown morphology of GO and the changes in CF surface microstructure before and after remediation were investigated in detail by scanning tunneling microscopy and Raman spectroscopy. The effects of surface repair on the mechanical properties of the CF and the resulting composites were investigated systematically. The results of scanning tunneling microscopy show that the graphene oxide formed on the surface of carbon fiber present uniform dispersion. Raman spectroscopy curves indicate that CF successfully remediated the defects in the CF surface. The results of mechanical properties testing show that such a remediation method could significantly enhance the tensile strength of CF and increase the interfacial strength versus raw fibers; that is, the tensile strength of CF was enhanced by 42% and the interfacial strength by 33.7%.

Scanning Tunneling Microscopy of Amorphous Carbon Films

1990 ◽  
Vol 48 (1) ◽  
pp. 318-319
Author(s):  
Mircea Fotino ◽  
D.C. Parks
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Amorphous Carbon ◽  
Carbon Films ◽  
Atomic Scale ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Amorphous Carbon Films ◽  
Image Optimization ◽  
Step Procedure ◽  
Stm Images

In the last few years scanning tunneling microscopy (STM) has made it possible and easily accessible to visualize surfaces of conducting specimens at the atomic scale. Such performance allows the detailed characterization of surface morphology in an increasing spectrum of applications in a wide variety of fields. Because the basic imaging process in STM differs fundamentally from its equivalent in other well-established microscopies, good understanding of the imaging mechanism in STM enables one to grasp the correct information content in STM images. It thus appears appropriate to explore by STM the structure of amorphous carbon films because they are used in many applications, in particular in the investigation of delicate biological specimens that may be altered through the preparation procedures.All STM images in the present study were obtained with the commercial instrument Nanoscope II (Digital Instruments, Inc., Santa Barbara, California). Since the importance of the scanning tip for image optimization and artifact reduction cannot be sufficiently emphasized, as stressed by early analyses of STM image formation, great attention has been directed toward adopting the most satisfactory tip geometry. The tips used here consisted either of mechanically sheared Pt/Ir wire (90:10, 0.010" diameter) or of etched W wire (0.030" diameter). The latter were eventually preferred after a two-step procedure for etching in NaOH was found to produce routinely tips with one or more short whiskers that are essentially rigid, uniform and sharp (Fig. 1) . Under these circumstances, atomic-resolution images of cleaved highly-ordered pyro-lytic graphite (HOPG) were reproducibly and readily attained as a standard criterion for easily recognizable and satisfactory performance (Fig. 2).

Scanning tunneling microscopy of films of amorphous carbon doped with copper

2000 ◽  
Vol 34 (2) ◽  
pp. 217-220 ◽  
Author(s):  
A. O. Golubok ◽  
O. M. Gorbenko ◽  
T. K. Zvonareva ◽  
S. A. Masalov ◽  
V. V. Rozanov ◽  
...  
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Amorphous Carbon ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Carbon Doped

scholarly journals Scanning tunneling microscopy and Raman spectroscopy of polymeric sp–sp2 carbon atomic wires synthesized on the Au(111) surface

Nanoscale ◽  
2019 ◽  
Vol 11 (39) ◽  
pp. 18191-18200 ◽  
Author(s):  
Andi Rabia ◽  
Francesco Tumino ◽  
Alberto Milani ◽  
Valeria Russo ◽  
Andrea Li Bassi ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Scanning Tunneling Microscopy ◽  
Scanning Tunneling ◽  
Vibrational Properties ◽  
Tunneling Microscopy ◽  
Atomic Wires

The structure and electronic and vibrational properties of sp–sp2 carbon atomic wires have been investigated by combined STM/STS and Raman spectroscopy.

Structural Investigation of Zeolite-templated, Ordered Microporous Carbon by Scanning Tunneling Microscopy and Raman Spectroscopy

Langmuir ◽  
2005 ◽  
Vol 21 (19) ◽  
pp. 8817-8823 ◽  
Author(s):  
J. I. Paredes ◽  
A. Martínez-Alonso ◽  
T. Yamazaki ◽  
K. Matsuoka ◽  
J. M. D. Tascón ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Scanning Tunneling Microscopy ◽  
Structural Investigation ◽  
Microporous Carbon ◽  
Scanning Tunneling ◽  
Tunneling Microscopy
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