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

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.

2017 ◽  
Vol 45 ◽  
pp. 199-207 ◽  
Author(s):  
Xin Wang ◽  
Peng Li ◽  
Claudia Luedecke ◽  
Qiang Zhang ◽  
Zan Wang ◽  
...  

Graphene films have been intensively explored because of their unique mechanical and physicochemical properties for potential applications in field of tissue engineering and implants. However, for biomedical applications, it is necessary to fully understand the toxicity and biocompatibility of the prepared graphene films since different synthesis method might lead to different biological properties. Here we report a step-by-step thermal reduction method of preparing reduced graphene oxide (rGO) film directly on various substrates at low heating temperature (below about 200 °C) without requiring any chemical reduction agent like hydrazine or other reductants (therefore we call it green method). Slowly heating GO hydrosol that was coated on the surface of a glass cell-culture dish or inside of a polypropylene tube from room temperature to 60, 100, and 160 °C for 12 h, respectively, a shiny and flat surface without crumpled structure or tiny pores was formed. We peeled it off from the substrate to explore its cytotoxicity. The results exhibited that the rGO film was biocompatible with Cal-72 cell but against Escherichia coli bacteria. Our work confirmed that rGO film produced by the green reduction method is cytocompatible with mammalian cells, which makes this rGO film a promising material for tissue engineering scaffold or as a surface-modification coating of an implant.


2018 ◽  
Vol 6 (24) ◽  
pp. 11471-11478 ◽  
Author(s):  
Daoqing Liu ◽  
Qianwei Li ◽  
Huazhang Zhao

Fabrication of holey reduced graphene oxide films with oxygen-containing groups and their application for all-solid-state supercapacitors.


2020 ◽  
Vol 180 ◽  
pp. 108449 ◽  
Author(s):  
Dongjun Lv ◽  
Hsiu-Sun Sung ◽  
Xiujing Li ◽  
Xia Zhang ◽  
Zheng Li ◽  
...  

RSC Advances ◽  
2017 ◽  
Vol 7 (52) ◽  
pp. 32749-32756 ◽  
Author(s):  
Huan Yuan ◽  
Xiaosong Du ◽  
Huiling Tai ◽  
Xiao Yang ◽  
Ming Xu

Schematic diagram of single-layer stationary phase film (a) and two-step stationary phase film (b).


2013 ◽  
Vol 29 (7) ◽  
pp. 643-652 ◽  
Author(s):  
Tina Mesarič ◽  
Kristina Sepčič ◽  
Veronica Piazza ◽  
Chiara Gambardella ◽  
Francesca Garaventa ◽  
...  

Nano Letters ◽  
2013 ◽  
Vol 13 (12) ◽  
pp. 5777-5784 ◽  
Author(s):  
Matthew P. McDonald ◽  
Ahmed Eltom ◽  
Felix Vietmeyer ◽  
Janak Thapa ◽  
Yurii V. Morozov ◽  
...  

2013 ◽  
Vol 58 (11) ◽  
pp. 1614-1618 ◽  
Author(s):  
A. E. Aleksenskii ◽  
P. N. Brunkov ◽  
A. T. Dideikin ◽  
D. A. Kirilenko ◽  
Yu. V. Kudashova ◽  
...  

2009 ◽  
Vol 21 (17) ◽  
pp. 1756-1760 ◽  
Author(s):  
Zhong-Shuai Wu ◽  
Songfeng Pei ◽  
Wencai Ren ◽  
Daiming Tang ◽  
Libo Gao ◽  
...  

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