scholarly journals A new method to exfoliate Graphite oxide and application for synthesis Graphene by chemical method

2014 ◽  
Vol 17 (2) ◽  
pp. 27-34
Author(s):  
Tam Thanh Mai ◽  
Nhan Thuc Chi Ha ◽  
Huy Thuc Ha
Keyword(s):  
Graphene Oxide ◽  
Polyethylene Oxide ◽  
Graphite Oxide ◽  
Single Layer ◽  
New Method ◽  
Single Layer Graphene ◽  
X Ray ◽  
Exfoliated Graphene ◽  
Graphene Paper ◽  
Crystalline Peak

A new method to separate graphite oxide (GO) modified by polyethylene oxide (PEO) by the aid of ultrasonic radiation was developed. Modified GO (graphene oxide or single layer of graphite oxide) did not show not appear crystalline peak (d002) on the X-Ray and took the form of a single layer graphene oxide on the image AFM and TEM. The exfoliated graphene oxide was reduced (RGO) to graphene by the reducing agent system HI – Acetic acid (HI-AcOH). The sheet resistance of RGOHI-AcOH is about 120 Ω/sq in the form graphene paper. In addition, FTIR, UV-Vis and Raman spectra showed more clearly about characteristics of graphite oxide, graphene oxide and RGOHI-AcOH.

Well-Aligned Graphene Oxide Nanosheets Decorated with Zinc Oxide Nanocrystals for High Performance Photocatalytic Application

2015 ◽  
Vol 14 (03) ◽  
pp. 1550007 ◽  
Author(s):  
K. Kaviyarasu ◽  
C. Maria Magdalane ◽  
E. Manikandan ◽  
M. Jayachandran ◽  
R. Ladchumananandasivam ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Graphene Oxide ◽  
High Performance ◽  
Chemical Reduction ◽  
Visible Region ◽  
Single Layer ◽  
Single Layer Graphene ◽  
Graphene Oxides ◽  
X Ray ◽  
Nanoscale Structures

Graphene oxide (GO) nanosheets modified with zinc oxide nanocrystals were achieved by a green wet-chemical approach. As-obtained products were characterized by XRD, Raman spectra, XPS, HR-TEM, EDS, PL and Photocatalytic studies. XRD studies indicate that the GO nanosheet have the same crystal structure found in hexagonal form of ZnO . The enhanced Raman spectrum of 2D bands confirmed formation of single layer graphene oxides. The gradual photocatalytic reduction of the GO nanosheet in the GO : ZnO suspension of ethanol was studied by using X-ray photoelectron (XPS) spectroscopy. The nanoscale structures were observed and confirmed using high resolution transmission electron microscopy (HR-TEM). The evolution of the elemental composition, especially the various numbers of layers were determined from energy dispersive X-ray spectra (EDS). PL properties of GO : ZnO nanosheet were found to be dependent on the growth condition and the resultant morphology revealed that GO nanosheet were highly transparent in the visible region. The photocatalytic performance of GO : ZnO nanocomposites was performed under UV irradiation. Therefore, the ZnO nanocrystals in the GO : ZnO composite could be applied in gradual chemical reduction and consequently tuning the electrical conductivity of the graphene oxide nanosheet.

Preparation of Graphene with Ultrasound-Assisted in the Process of Oxidation

2010 ◽  
Vol 34-35 ◽  
pp. 1784-1787 ◽  
Author(s):  
Hui Jiang Yu ◽  
Zheng Guang Zou ◽  
Fei Long ◽  
Chun Yan Xie ◽  
Hao Ma
Keyword(s):  
Graphene Oxide ◽  
Graphite Oxide ◽  
Oxidation Process ◽  
Single Layer ◽  
Single Layer Graphene ◽  
Hummers Method ◽  
Reduced Products ◽  
Ft Ir ◽  
Ir Analysis ◽  
Xrd Patterns

To get single-layer of graphene, exfoliating fully intercalated graphite oxide into single- layer graphene oxide is one of the important factors. In this paper, graphite oxide prepared by the Improved Hummers Method, and ultrasound was added to the Low-temperature Reaction of this oxidation process to improve the efficiency of intercalation. Then the obtained graphene oxide was dispersed with surfactant and reduced with Hydrazine Hydrate. XRD patterns indicated that the layer distance of graphite oxide did increased at the aid of the ultrasound, and the obtained reduced products were single- and few-layer. FT-IR analysis further confirmed the preparation of graphite oxide and graphene.

Formation of defects in the graphite oxidization process: a positron study

RSC Advances ◽  
2015 ◽  
Vol 5 (108) ◽  
pp. 88908-88914 ◽  
Author(s):  
Wei Gong ◽  
Dongning He ◽  
Jinlong Tao ◽  
Pengfei Zhao ◽  
Lingxue Kong ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Graphite Oxide ◽  
Exfoliated Graphene

A difference in 2D-DBAR-ratio curves reveals different vacancy-like defects observed by positron measurements in unexfoliated graphite oxide and exfoliated graphene oxide samples.

Tuning the electrical properties of exfoliated graphene layers using deep ultraviolet irradiation

2014 ◽  
Vol 2 (27) ◽  
pp. 5404-5410 ◽  
Author(s):  
M. Z. Iqbal ◽  
M. F. Khan ◽  
M. W. Iqbal ◽  
Jonghwa Eom
Keyword(s):  
Electrical Properties ◽  
Ultraviolet Irradiation ◽  
Single Layer ◽  
Single Layer Graphene ◽  
Graphene Bilayer ◽  
Graphene Layers ◽  
Exfoliated Graphene ◽  
Deep Ultraviolet ◽  
Trilayer Graphene ◽  
Unique Band

Deep ultraviolet irradiation tunes the electronic properties of mechanically exfoliated single-layer graphene, bilayer graphene, and trilayer graphene while maintaining their unique band structure and electrical properties.

Effects of single layer graphene and graphene oxide modification on the properties of phthalocyanine blue pigments

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

Effects of nano carbon black and single-layer graphene oxide on settlement, survival and swimming behaviour ofAmphibalanus amphitritelarvae

2013 ◽  
Vol 29 (7) ◽  
pp. 643-652 ◽  
Author(s):  
Tina Mesarič ◽  
Kristina Sepčič ◽  
Veronica Piazza ◽  
Chiara Gambardella ◽  
Francesca Garaventa ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Carbon Black ◽  
Single Layer ◽  
Single Layer Graphene ◽  
Swimming Behaviour ◽  
Layer Graphene ◽  
Nano Carbon

Direct Observation of Spatially Heterogeneous Single-Layer Graphene Oxide Reduction Kinetics

Nano Letters ◽  
2013 ◽  
Vol 13 (12) ◽  
pp. 5777-5784 ◽  
Author(s):  
Matthew P. McDonald ◽  
Ahmed Eltom ◽  
Felix Vietmeyer ◽  
Janak Thapa ◽  
Yurii V. Morozov ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Direct Observation ◽  
Single Layer ◽  
Single Layer Graphene ◽  
Reduction Kinetics ◽  
Oxide Reduction ◽  
Layer Graphene

Single-layer graphene oxide films on a silicon surface

2013 ◽  
Vol 58 (11) ◽  
pp. 1614-1618 ◽  
Author(s):  
A. E. Aleksenskii ◽  
P. N. Brunkov ◽  
A. T. Dideikin ◽  
D. A. Kirilenko ◽  
Yu. V. Kudashova ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Silicon Surface ◽  
Oxide Films ◽  
Single Layer ◽  
Single Layer Graphene ◽  
Layer Graphene

Synthesis of Polyacetylene-like Modified Graphene Oxide Aerogel and Its Enhanced Electrical Properties

2019 ◽  
Author(s):  
Enrico Greco ◽  
Jing Shang ◽  
jiali zhu ◽  
Tong Zhu
Keyword(s):  
Graphene Oxide ◽  
Three Dimensional ◽  
Single Layer ◽  
Internal Surface ◽  
Solid Material ◽  
Single Layer Graphene ◽  
Covalent Bonds ◽  
Surface Areas ◽  
Modified Graphene Oxide ◽  
The Individual

<p>A graphene-based or carbon-based aerogel is a three-dimensional (3D) solid material in which the carbon atoms are arranged in a sheet-like nanostructure. In this study, we report the synthesis of low-density polymer-modified aerogel monoliths by 3D macro-assemblies of graphene oxide sheets that exhibit significant internal surface areas (982 m<sup>2</sup>/g) and high electrical conductivity (∼0.1 to 1 × 10<sup>2</sup> S/cm). Different types of materials were prepared to obtain a single monolithic solid starting from a suspension of single-layer graphene oxide (GO) sheets, and a polymer, made from the precursors 4-carboxybenzaldehyde and polyvinyl alcohol. These materials were used to cross-link the individual sheets by covalent bonds, resulting in wet-gels that were supercritically dried and then, in some cases, thermally reduced to yield graphene aerogel composites. The average densities were approaching 15-20 mg/cm<sup>3</sup>. This approach allowed for the modulation of distance between the sheets, pore dimension, surface area, and related properties. This specific GO/Polymer ratio has suitable malleability making it a viable candidate for use in conductivity 3D printing; it also has other properties suitable for energy storage, catalysis, sensing and biosensing applications, bioelectronics, and superconductors.</p>

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