scholarly journals Raman modes in transferred bilayer CVD graphene

Open Physics ◽  
2015 ◽  
Vol 13 (1) ◽  
Author(s):  
Ahti Niilisk ◽  
Tauno Kahro ◽  
Valter Kiisk ◽  
Mihkel Rähn ◽  
Harry Alles ◽  
...  
Keyword(s):  
Spectroscopic Study ◽  
Single Layer ◽  
Single Layer Graphene ◽  
Cvd Graphene ◽  
Raman Spectroscopic ◽  
Raman Spectroscopic Study ◽  
Layer Graphene ◽  
Raman Modes ◽  
Twisted Bilayer Graphene ◽  
Cu Foil

AbstractA systematic experimental Raman spectroscopic study of twisted bilayer graphene (tBLG) domains localized inside wide-area single layer graphene (SLG) produced by low-pressure CVD on Cu foil and transferred onto SiO

scholarly journals Continuous Growth of Highly Reproducible Single-Layer Graphene Deposition on Cu Foil by Indigenously Developed LPCVD Setup

ACS Omega ◽  
2019 ◽  
Vol 4 (2) ◽  
pp. 2893-2901
Author(s):  
Pradeep Kumar Kashyap ◽  
Indu Sharma ◽  
Bipin Kumar Gupta
Keyword(s):  
Single Layer ◽  
Single Layer Graphene ◽  
Continuous Growth ◽  
Layer Graphene ◽  
Cu Foil

scholarly journals Methane as an effective hydrogen source for single-layer graphene synthesis on Cu foil by plasma enhanced chemical vapor deposition

Nanoscale ◽  
2013 ◽  
Vol 5 (3) ◽  
pp. 1221 ◽  
Author(s):  
Yong Seung Kim ◽  
Jae Hong Lee ◽  
Young Duck Kim ◽  
Sahng-Kyoon Jerng ◽  
Kisu Joo ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Single Layer ◽  
Chemical Vapor ◽  
Single Layer Graphene ◽  
Layer Graphene ◽  
Graphene Synthesis ◽  
Cu Foil ◽  
Effective Hydrogen

Synthesis, Thermal Expansion Properties and Raman Spectroscopic Study of Ca1-xSrxZr4P6O24 Ceramics

2011 ◽  
Vol 415-417 ◽  
pp. 1023-1027 ◽  
Author(s):  
Zhi Hong Wang ◽  
Dong Yan Xie ◽  
Bao He Yuan ◽  
Xian Sheng Liu ◽  
Wen Bo Song ◽  
...  
Keyword(s):  
Solid Solution ◽  
Thermal Expansion ◽  
Spectroscopic Study ◽  
Energy Costs ◽  
Raman Spectroscopic ◽  
Raman Spectroscopic Study ◽  
Low Thermal Expansion ◽  
Raman Modes ◽  
Cation Size ◽  
Time And Energy

A simplified method with much lower time and energy costs is presented for the rapid synthesis of low thermal expansion materials of CaZr4P6O24, SrZr4P6O24 and their solid solution Ca0.5Sr0.5Zr4P6O24. The coefficients of thermal expansion of CaZr4P6O24, SrZr4P6O24 and Ca0.5Sr0.5Zr4P6O24 are measured to be -1.45×10-6, 2.1×10-6 and 0.26×10-6, respectively. Raman spectroscopic study confirms the formation of the solid solution of Ca0.5Sr0.5Zr4P6O24 though its symmetric and asymmetric stretching modes are obviously broadened with respect to those of CaZr4P6O24 and SrZr4P6O24 due to the lattice deformation by incorporation of Ca2+ and Sr2+ with different cation size. The shifts of the asymmetric stretching Raman modes and the librational/translational modes with temperature in Ca0.5Sr0.5Zr4P6O24 are between those in CaZr4P6O24 and SrZr4P6O24, suggesting a cancelling effect of Ca2+ and Sr2+ cations in the thermal expansion of Ca0.5Sr0.5Zr4P6O24.

scholarly journals Influence of growth kinetics on graphene domains shape under atmospheric pressure chemical vapor deposition

2020 ◽  
Vol 5 (3-4) ◽  
pp. 75-81
Author(s):  
Mopeli Samuel Fabiane ◽  
Moshawe Jack Madito ◽  
Ncholu Manyala
Keyword(s):  
Chemical Vapor Deposition ◽  
Growth Kinetics ◽  
Vapor Deposition ◽  
Atmospheric Pressure ◽  
Single Layer ◽  
Chemical Vapor ◽  
Single Layer Graphene ◽  
Layer Graphene ◽  
Pressure Chemical ◽  
Cu Foil

Abstract In this work, the role of gas kinetics in the growth of lobed graphene domains by atmospheric pressure chemical vapor deposition (AP-CVD) is elucidated by sandwiching Cu foil between Si/SiO2 wafers. Two different growths were carried out: (1) A Cu foil was placed at the center of a quartz tube in AP-CVD for graphene growth and (2) another Cu foil was sandwiched between Si/SiO2 wafers to alter the nucleation growth kinetics of graphene domains to mimic those in low-pressure chemical vapor deposition (LP-CVD). From the scanning electron microscopy (SEM) images, the graphene domains of the sandwiched Cu foil displayed mostly four-lobed, parallel-sided domains which are usually obtained under LP-CVD as compared to Cu foil without sandwiching which showed typical hexagonal graphene domains of AP-CVD. The Raman spectroscopy confirmed that the domains are single-layer graphene. An electron backscatter diffraction (EBSD) showed that the Cu foil is predominantly (001). The results of this study agree with the theoretical predictions of growth kinetics in graphene synthesis by CVD and showed that it is possible to obtain single-layer graphene domains which are usually obtained under LP-CVD by restricting the gas flux through the boundary layer. Graphic abstract

Internal Friction and Shear Modulus of Graphene Films

2012 ◽  
Vol 184 ◽  
pp. 319-324 ◽  
Author(s):  
Xiao Liu ◽  
Thomas H. Metcalf ◽  
Jeremy T. Robinson ◽  
F. Keith Perkins ◽  
Brian H. Houston
Keyword(s):  
Graphene Oxide ◽  
Internal Friction ◽  
Shear Modulus ◽  
Reduced Graphene Oxide ◽  
Single Layer ◽  
Single Layer Graphene ◽  
Cvd Graphene ◽  
Layer Graphene ◽  
Graphene Films ◽  
Reduced Graphene

We report internal friction and shear modulus measurements of several types of synthesized graphene films. They include reduced graphene oxide, chemical-vapor deposited (CVD) graphene films on thin nickel films and on copper foils. These films were transferred from their host substrate into a water bath, and re-deposited onto to a high-Q single crystal silicon mechanical double-paddle oscillator. A minimal thickness dependence of both internal friction and shear modulus was found for reduced graphene oxide films varying thickness from 4 to 90 nm and CVD graphene films on nickel from 6 to 8 nm. The shear modulus of these multilayered films averages 53 GPa. Their internal friction exhibits a temperature independent plateau below 10K. The values of the plateaus are similar for both the reduced graphene oxide films and CVD graphene films on nickel, and they are as high as the universal "glassy range" where the tunneling states dominated internal friction of amorphous solids lies. In contrast, CVD graphene films on copper foils are 90~95% single layer. The shear modulus of these single layer graphene films are about five times higher, averaging 280 GPa. Their low temperature internal friction is too small to measure within the uncertainty of our experiments. Our results demonstrate the dramatic difference in the elastic properties of multilayer and single layer graphene films.

scholarly journals Synthesis of few layer graphene by direct exfoliation of graphite and a Raman spectroscopic study

AIP Advances ◽  
2014 ◽  
Vol 4 (2) ◽  
pp. 027116 ◽  
Author(s):  
S. Gayathri ◽  
P. Jayabal ◽  
M. Kottaisamy ◽  
V. Ramakrishnan
Keyword(s):  
Spectroscopic Study ◽  
Raman Spectroscopic ◽  
Raman Spectroscopic Study ◽  
Layer Graphene ◽  
Few Layer Graphene
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