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Epitaxial graphene films have been prepared by pulsed laser deposition. X-ray photoelectron spectroscopy analysis shows that the carbon binding energy is 284.7 eV, corresponding to sp2-C. Raman spectroscopy indicates that there exists 2D and D peaks and thus graphene structures have been formed. Meanwhile, according to high-resolution transmission electron microscopy analysis, suitable depositing...
To control deposition profile of carbon films in trenches, we have studied substrate temperature dependence of deposition rate of carbon films and we have realized anisotropic deposition of carbon films in trenches above 250° deposited by CVD plasma of toluene diluted H2, in trenches. Here, we report dependence of properties of plasma CVD carbon films on substrate temperature.
In this paper the effect of single nanosecond laser pulse irradiation on the microstructure and field emission (FE) properties of carbon films is studied. Amorphous carbon films are exposed to a single pulse of a 248 nm excimer laser with pulse width of 23 nsec and varying energies. Microstructural changes of the films are investigated by Raman spectroscopy, transmission electron microscopy and electron...
In this work, we report an efficient method of chemical vapour deposition, without use of any metal catalysts, for the successful synthesis of vertical graphene nanoflake films (GNFs) on Si substrate. Effects of the growth condition on the surface morphology, microstructure, and chemical composition of GNFs are characterized by using scanning electron microscopy, transmission electron microscopy,...
Multi-walled carbon nanotubes (MWCNTs) film have been analyzed by Raman spectroscopy to clarify the effect of a pulsed Nd: YAG laser heating. The MWCNTs film surface was flashed with the fundamental harmonic (?? = 1064 nm) or the second harmonic (?? = 532 nm) of a single pulse of Nd: YAG laser in the air. The dynamics of pulsed nanosecond laser heating process was simulated by the solution of the...
Non-hydrogenated high sp3 content diamond-like carbon (DLC) has been subjected to intensive research efforts over the last three decades owing to its superior material properties. By introducing some metals/dopants into DLC film during deposition, the microstructure and properties of the films can be further modified, where studies have demonstrated it as an effective method to reduce the internal...
A challenge in exploiting the electrical properties of graphene is the fabrication of large area thin films in a scalable and inexpensive manner. The lack of a reliable and simple graphite exfoliation procedure has hindered the possibility of making films starting from pure graphene. This paper presents a scalable manner to obtain films of pure graphene on virtually any substrate with reproducible...
In this work, carbon nanotubes and carbon nanofibres (CNTs-CNFs) composite film was synthesized by low pressure thermal chemical vapor deposition. CNTs-CNFs film was characterized by scanning electron microscopy and Raman spectroscopy. The effect of different growth temperature on the morphology of CNTs-CNFs and electrosorption of NaCl solution by CNTs-CNFs film grown at 550degC, 600degC, 650degC...
We have investigated uniform carbon nanotube (CNT) dispersion in a solution and fabrication of CNT thin films on solid surfaces. To prevent bundle formation, we have examined surface modification of both the CNT surfaces and the substrate surfaces. To enhance the interaction between surfaces of the substrate and the CNTs, the substrate surfaces were made hydrophobic, because CNTs are generally hydrophobic...
This paper investigates structural and mechanical properties of present carbon overcoats for a number of sliders and disks manufactured by various vendors. Raman spectroscopy is first used to identify the morphology of the carbon overcoats and to evaluate to what extend the carbon films show differences for films manufactured by different vendors. In addition, characterization of the mechanical properties...
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