Dependence of the Raman spectrum characteristics on the number of layers and stacking orientation in few-layer graphene

2015 ◽  
Vol 252 (11) ◽  
pp. 2375-2379 ◽  
Author(s):  
Maxime Bayle ◽  
Nicolas Reckinger ◽  
Jean-Roch Huntzinger ◽  
Alexandre Felten ◽  
Ahmad Bakaraki ◽  
...  
Keyword(s):  
Raman Spectrum ◽  
Layer Graphene ◽  
Number Of Layers ◽  
Spectrum Characteristics ◽  
Few Layer Graphene

The influence of nanoscale roughness and substrate chemistry on the frictional properties of single and few layer graphene

Nanoscale ◽  
2015 ◽  
Vol 7 (22) ◽  
pp. 10021-10029 ◽  
Author(s):  
Jessica C. Spear ◽  
James P. Custer ◽  
James D. Batteas
Keyword(s):  
Rough Surfaces ◽  
Frictional Properties ◽  
Layer Graphene ◽  
Number Of Layers ◽  
Few Layer Graphene ◽  
Nanoscale Roughness

Graphene's lack of conformity to rough surfaces impacts its frictional properties, depending on the number of layers and substrate bonding.

scholarly journals Identification of mono-and few-layer graphene: Raman study

2018 ◽  
Vol 3 (1) ◽  
Author(s):  
M. Boutahir ◽  
Ah Rahmani ◽  
H. Chadli ◽  
A. Rahmani
Keyword(s):  
Raman Spectra ◽  
Theoretical Work ◽  
Multilayer Graphene ◽  
Raman Analysis ◽  
Graphene Layers ◽  
Layer Graphene ◽  
Number Of Layers ◽  
Raman Study ◽  
Few Layer Graphene ◽  
Good Agreement

In this theoretical work, the Raman spectra were analyzed by considering the origin of the G peak, its shape, position and relative intensity as a function of the number of graphene layers. By using the spectral moment’s method, the Raman spectra of mono, bi and few-layers of graphene are calculated and a good agreement was found with group theory concerning the number of the Raman-active modes and the Raman measurements. Our results provide a Raman analysis to evaluate the number of layers in multilayer graphene. #Raman_spectroscopy #graphene #graphite

scholarly journals Characterizing the maximum number of layers in chemically exfoliated graphene

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Péter Szirmai ◽  
Bence G. Márkus ◽  
Julio C. Chacón-Torres ◽  
Philipp Eckerlein ◽  
Konstantin Edelthalhammer ◽  
...  
Keyword(s):  
Single Layer ◽  
Vapour Phase ◽  
Single Layer Graphene ◽  
Graphene Layers ◽  
Layer Graphene ◽  
Exfoliated Graphene ◽  
Upper Limit ◽  
Number Of Layers ◽  
Graphene Flakes ◽  
Few Layer Graphene

AbstractAn efficient route to synthesize macroscopic amounts of graphene is highly desired and bulk characterization of such samples, in terms of the number of layers, is equally important. We present a Raman spectroscopy-based method to determine the typical upper limit of the number of graphene layers in chemically exfoliated graphene. We utilize a controlled vapour-phase potassium intercalation technique and identify a lightly doped stage, where the Raman modes of undoped and doped few-layer graphene flakes coexist. The spectra can be unambiguously distinguished from alkali doped graphite, and modeling with the typical upper limit of the layers yields an upper limit of flake thickness of five layers with a significant single-layer graphene content. Complementary statistical AFM measurements on individual few-layer graphene flakes find a consistent distribution of the layer numbers.

scholarly journals Preparation of Single- and Few-Layer Graphene Sheets Using Co Deposition on SiC Substrate

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Cun Li ◽  
Dandan Li ◽  
Jingjing Yang ◽  
Xiaopeng Zeng ◽  
Wenxia Yuan
Keyword(s):  
Carbon Diffusion ◽  
Product Layer ◽  
Graphene Sheets ◽  
Cooling Process ◽  
Layer Graphene ◽  
Number Of Layers ◽  
Highly Sensitive ◽  
Selective Chemical ◽  
Few Layer Graphene ◽  
Cobalt Silicides

Single- and few-layer graphene sheets were fabricated by selective chemical reactions between Co film and SiC substrate. A rapid cooling process was employed. The number of layers and crystallinity of graphene sheets were controlled by process parameters. The formation mechanism of graphene was highly sensitive to carbon diffusion. Free carbon precipitated and then moved across the product layer that was composed mainly of cobalt-silicides. The graphene layer formed homogeneously on the surface and then transferred to the other substrate. This could provide a method for high-quality fabrication of wafer-sized graphene sheets.

Determining the number of layers in few-layer graphene by combining Raman spectroscopy and optical contrast

2017 ◽  
Vol 49 (1) ◽  
pp. 36-45 ◽  
Author(s):  
Maxime Bayle ◽  
Nicolas Reckinger ◽  
Alexandre Felten ◽  
Périne Landois ◽  
Ophélie Lancry ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Optical Contrast ◽  
Layer Graphene ◽  
Number Of Layers ◽  
Few Layer Graphene

scholarly journals Properties of Silicone Rubber-Based Composites Reinforced with Few-Layer Graphene and Iron Oxide or Titanium Dioxide

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1550
Author(s):  
Vineet Kumar ◽  
Anuj Kumar ◽  
Minseok Song ◽  
Dong-Joo Lee ◽  
Sung-Soo Han ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Titanium Dioxide ◽  
Iron Oxide ◽  
Stress Relaxation ◽  
Silicone Rubber ◽  
Room Temperature ◽  
Relaxation Rates ◽  
Layer Graphene ◽  
Few Layer Graphene ◽  
Mechanical Actuation

The increasing demand for polymer composites with novel or improved properties requires novel fillers. To meet the challenges posed, nanofillers such as graphene, carbon nanotubes, and titanium dioxide (TiO2) have been used. In the present work, few-layer graphene (FLG) and iron oxide (Fe3O4) or TiO2 were used as fillers in a room-temperature-vulcanized (RTV) silicone rubber (SR) matrix. Composites were prepared by mixing RTV-SR with nanofillers and then kept for vulcanization at room temperature for 24 h. The RTV-SR composites obtained were characterized with respect to their mechanical, actuation, and magnetic properties. Fourier-transform infrared spectroscopy (FTIR) analysis was performed to investigate the composite raw materials and finished composites, and X-ray photoelectron spectroscopy (XPS) analysis was used to study composite surface elemental compositions. Results showed that mechanical properties were improved by adding fillers, and actuation displacements were dependent on the type of nanofiller used and the applied voltage. Magnetic stress-relaxation also increased with filler amount and stress-relaxation rates decreased when a magnetic field was applied parallel to the deformation axes. Thus, this study showed that the inclusion of iron oxide (Fe3O4) or TiO2 fillers in RTV-SR improves mechanical, actuation, and magnetic properties.

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