scholarly journals Scalable production of large quantities of defect-free few-layer graphene by shear exfoliation in liquids

2014 ◽  
Vol 13 (6) ◽  
pp. 624-630 ◽  
Author(s):  
Keith R. Paton ◽  
Eswaraiah Varrla ◽  
Claudia Backes ◽  
Ronan J. Smith ◽  
Umar Khan ◽  
...  
Keyword(s):  
Layer Graphene ◽  
Few Layer Graphene ◽  
Scalable Production

scholarly journals Preparation of Few-Layer Graphene Dispersions from Hydrothermally Expanded Graphite

2019 ◽  
Vol 9 (12) ◽  
pp. 2539 ◽  
Author(s):  
Cristian Vacacela Gomez ◽  
Talia Tene ◽  
Marco Guevara ◽  
Gabriela Tubon Usca ◽  
Dennys Colcha ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Expanded Graphite ◽  
Hexadecyltrimethylammonium Bromide ◽  
Natural Graphite ◽  
Layer Graphene ◽  
Novel Approach ◽  
Long Time ◽  
Few Layer Graphene ◽  
Scalable Production ◽  
Surfactant Aqueous Solution

In this study, we propose a novel approach to prepare few-layer graphene (FLG) dispersions, which is realized by exfoliating natural graphite flakes in a surfactant aqueous solution under hydrothermal treatment and liquid-phase exfoliation. In order to obtain stable and well-dispersed FLG dispersions, pristine graphite is hydrothermally expanded in a hexadecyltrimethylammonium bromide (CTAB) aqueous solution at 180 °C for 15 h, followed by sonication up to 3 h. In comparison to long-time sonication methods, the present method is significantly efficient, and most importantly, does not involve the use of an oxidizing agent and hazardous media, which will make it more competent in the scalable production of graphene.

scholarly journals Interlayer catalytic exfoliation realizing scalable production of large-size pristine few-layer graphene

2013 ◽  
Vol 3 (1) ◽  
Author(s):  
Xiumei Geng ◽  
Yufen Guo ◽  
Dongfang Li ◽  
Weiwei Li ◽  
Chao Zhu ◽  
...  
Keyword(s):  
Layer Graphene ◽  
Large Size ◽  
Few Layer Graphene ◽  
Scalable Production

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.

scholarly journals Temperature Dependence of G and D’ Phonons in Monolayer to Few-Layer Graphene with Vacancies

2020 ◽  
Vol 15 (1) ◽  
Author(s):  
Mingming Yang ◽  
Longlong Wang ◽  
Xiaofen Qiao ◽  
Yi Liu ◽  
Yufan Liu ◽  
...  
Keyword(s):  
Negative Temperature Coefficient ◽  
Negative Temperature ◽  
Intrinsic Properties ◽  
Temperature Dependent ◽  
Phonon Interaction ◽  
Electron Phonon Interaction ◽  
Layer Graphene ◽  
A Value ◽  
Few Layer Graphene

Abstract The defects into the hexagonal network of a sp2-hybridized carbon atom have been demonstrated to have a significant influence on intrinsic properties of graphene systems. In this paper, we presented a study of temperature-dependent Raman spectra of G peak and D’ band at low temperatures from 78 to 318 K in defective monolayer to few-layer graphene induced by ion C+ bombardment under the determination of vacancy uniformity. Defects lead to the increase of the negative temperature coefficient of G peak, with a value almost identical to that of D’ band. However, the variation of frequency and linewidth of G peak with layer number is contrary to D’ band. It derives from the related electron-phonon interaction in G and D’ phonon in the disorder-induced Raman scattering process. Our results are helpful to understand the mechanism of temperature-dependent phonons in graphene-based materials and provide valuable information on thermal properties of defects for the application of graphene-based devices.

Few-layer graphene prepared via microwave irradiation of black sesame for supercapacitor applications

2021 ◽  
Vol 425 ◽  
pp. 130664
Author(s):  
Xinghe Xu ◽  
Shichang Sun ◽  
Juan Luo ◽  
Rui Ma ◽  
Junhao Lin ◽  
...  
Keyword(s):  
Microwave Irradiation ◽  
Layer Graphene ◽  
Few Layer Graphene ◽  
Supercapacitor Applications

Highly-doped p-type few-layer graphene on UID off-axis homoepitaxial 4H-SiC

2021 ◽  
Author(s):  
Tymoteusz Ciuk ◽  
Wawrzyniec Kaszub ◽  
Kinga Kosciewicz ◽  
Artur Dobrowolski ◽  
Jakub Jagiello ◽  
...  
Keyword(s):  
Layer Graphene ◽  
P Type ◽  
Few Layer Graphene
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