Synthesis of graphene on SiC substrate via Ni-silicidation reactions

Macháč, Petr; Fidler, Tomáš; Cichoň, Stanislav; Mišková, L.

doi:10.1016/j.tsf.2012.03.105

Cited by 14 publications

(12 citation statements)

References 23 publications

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“…Many authors have shown that it is possible to obtain from Raman analysis the inherent features of the graphene, including structural quality and the number of layers 23,[31][32][33] . Raman spectra obtained by laser excitation at 2.41 eV have shown that the G and 2D bands, which appear at approximately 1582 cm -1 and 2700 cm -1 , respectively, are the main features of a monolayer graphene 31 .…”

Section: Materials Characterizationmentioning

confidence: 99%

“…The G band is associated with the E 2g phonon mode at the Brillouin zone center, and this band originated from the first order Raman Scattering. The 2D band is originated from second-order, which involves the two Brillouin zone boundaries 23,31 . In some cases, the D band at ~1350 cm -1 and the less intensive peaks of the D' band at ~1620 ′also appear.…”

Section: Materials Characterizationmentioning

confidence: 99%

“…Also in Figure 3, the D band, which is representative of disorder and/or defects, was systematically observed. Unlike the graphene obtained by micromechanical cleavage from Highly Ordered Pyrolytic Graphite (HOPG), the graphene grown from crystalline SiC usually has defects (D-band) 22,23,35,36 . Because polycrystalline SiC was used in the present work for graphene growth, the presence of defects was expected.…”

Section: Materials Characterizationmentioning

confidence: 99%

“…Therefore, Si atoms will be sublimated and the graphitization will be able to occur, where the C atoms on the top of surface are rearranged to synthesize the epitaxial graphene 4,[16][17][18][19] . In order to create alternative processes, some studies have shown that the addition of a layer of "catalyst material" (such as Ni or Co) promotes the reduction of the temperature required for SiC decomposition [23][24][25][26] . Nevertheless, despite SiC dissociation is promoted in this case, the Si sublimation does not occur; rather a chemical reaction to form a silicide phase between the catalyst material and Si happens.…”

Section: Introductionmentioning

confidence: 99%

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Growth and Characterization of Graphene on Polycrystalline SiC Substrate Using Heating by CO2 Laser Beam

Galvão¹,

Vasconcelos²,

Santos³

et al. 2016

Mat. Res.

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The thermal decomposition of silicon carbide (SiC), with the subsequent formation of graphene, can be achieved by heating treatment. Several heating processes have been applied for this purpose by using SiC, either in form of powder particles or monocrystalline substrate. In this work, instead of using an expensive commercially available SiC wafer, a polycrystalline SiC substrate was obtained, based on powder metallurgy process, in order to explore the synthesis of graphene layers on its surface by using a CO 2 laser beam as heating source. Different levels of energy density (fluence) were applied and Raman spectroscopy analyses demonstrated that graphene layers were formed on the polycrystalline SiC surface. The ratio of the integrated intensity of the D and G bands, and the crystallite size were calculated. The FWHM of the 2D band peaks are in excellent agreement with the range of values found in the literature. The samples irradiated with energy density of 138.4 J/cm 2 presented lower concentration of defects and higher crystallite size, while the lowest FWHM was obtained for energy density of 188 J/cm 2 . The process occurred at room conditions and no gas flow was used. The results reveal a simple and cost-effective alternative for synthesis of graphene-based structures on SiC.

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Section: Materials Characterizationmentioning

confidence: 99%

Section: Materials Characterizationmentioning

confidence: 99%

Section: Materials Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Growth and Characterization of Graphene on Polycrystalline SiC Substrate Using Heating by CO2 Laser Beam

Galvão¹,

Vasconcelos²,

Santos³

et al. 2016

Mat. Res.

View full text Add to dashboard Cite

show abstract

“…Graphene, a two-dimensional sheet of sp 2 hybridized carbon atoms packaged into a honeycomb lattice structure, is characterized by a large surface area, high mechanicalflexibility, excellent chemical stability [5,9], high mobility of electrons that experimentally calculated value was 1.5 × 10 8 m 2 /Vs at room temperature and very low resistivity (1 × 10 −4 Ωm) [10]. Thus, it is considered an important material for electroanalysis.…”

Section: Introductionmentioning

confidence: 99%