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

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.

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

Science and Technology Development Journal ◽

10.32508/stdj.v17i2.1312 ◽

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.

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

International Journal of Nanoscience ◽

10.1142/s0219581x15500076 ◽

2015 ◽

Vol 14 (03) ◽

pp. 1550007 ◽

Cited By ~ 53

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.

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Molecular Imprinted Graphene Oxide Nanocomposite for Optical Sensing of Nicotine in Human Blood Plasma

Journal of the chemical society of pakistan ◽

10.52568/000696 ◽

2020 ◽

Vol 42 (6) ◽

pp. 856-856

Author(s):

Sehrish Qazi Sehrish Qazi ◽

Huma Shaikh Huma Shaikh ◽

Ayaz Ali Memon Ayaz Ali Memon ◽

and Shahabuddin Memon and Shahabuddin Memon

Keyword(s):

Graphene Oxide ◽

Human Plasma ◽

Human Blood ◽

Optical Sensor ◽

Single Layer ◽

Human Blood Plasma ◽

Buffer Concentration ◽

Imprinted Polymer ◽

Ft Ir

Among all psychotropic alkaloids, nicotine is more addictive, carcinogenic and capable of causing many health problems. This work is based on the development of highly robust, cheap, reliable, selective and sensitive nicotine imprinted graphene oxide nanocomposite (ImpGO nanocomposite) based optical sensor for determination of nicotine in human plasma. The ImpGO nanocomposite has been thoroughly characterized using different techniques i.e. FT-IR, SEM, TEM, Raman, etc. These characterizations revealed that ImpGO nanocomposite is comprised of single layer of graphene oxide successfully modified with imprinted polymer. The synthesized material was utilized to selectively determine nicotine using UV-vis spectrophotometer in BR buffer of 0.1 M at pH 3 and diluted human plasma. The effect of parameters such as buffer concentration, pH, amount of nanocomposite, etc on determination of nicotine using ImpGO nanocomposite were studied thoroughly. Thus, a sensitive optical method was developed for determination of nicotine in human plasma with linear range of 22-370 pM along with LOD and LOQ of 7 pM and 22 pM, respectively. The selectivity of sensor was evaluated using homologues of nicotine such as nicotine amide, caffeine and cotinine. The results obtained from biological samples showed that developed optical sensor is efficient in complex matrices of real sample.

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

Dyes and Pigments ◽

10.1016/j.dyepig.2020.108449 ◽

2020 ◽

Vol 180 ◽

pp. 108449 ◽

Cited By ~ 1

Author(s):

Dongjun Lv ◽

Hsiu-Sun Sung ◽

Xiujing Li ◽

Xia Zhang ◽

Zheng Li ◽

...

Keyword(s):

Graphene Oxide ◽

Single Layer ◽

Single Layer Graphene ◽

Layer Graphene

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Synthesis and Characterization of Ag/Graphene Nanocomposites by Solid-Liquid Sonochemical Reactions

Materials Science Forum ◽

10.4028/www.scientific.net/msf.804.119 ◽

2014 ◽

Vol 804 ◽

pp. 119-122 ◽

Cited By ~ 1

Author(s):

Tomofumi Mochizuki ◽

Yamato Hayashi ◽

Jun Fukushima ◽

Hirotsugu Takizawa

Keyword(s):

Silver Oxide ◽

Graphene Nanocomposites ◽

Hummers Method ◽

Ft Ir ◽

Physical Effects ◽

Diffraction Patterns ◽

Xrd Patterns ◽

Short Time ◽

Solid Liquid

In this study, Graphite Oxide (GO) and Ag/Graphene nanocomposites were synthesized by solid-liquid sonochemical reactions easily and briefly. GO was synthesized by means of Hummers method using sonication or stirring. From XRD patterns and FT-IR spectra, chemical and physical effects of ultrasound promoted the oxidation of Graphite. Ag/graphene nanocomposites were synthesized from GO and silver oxide by sonication. UV-vis spectra showed the peaks of Graphene oxide and Ag nanoparticle plasmon resonance absorption. EDX images and electron diffraction patterns confirmed Ag nanoparticles were decorated on Graphene sheets by ultrasound. Using sonication, GO and Ag/Graphene nanocomposites could be synthesized easily in short time.

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Oxidation of CVD Growth Single-Layer Graphene

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.790.7 ◽

2013 ◽

Vol 790 ◽

pp. 7-10 ◽

Cited By ~ 1

Author(s):

Hui Gao ◽

Yin Zhang

Keyword(s):

Vapor Deposition ◽

Acid Treatment ◽

Oxidation Process ◽

Single Layer ◽

Chemical Vapor ◽

Strong Acid ◽

Single Layer Graphene ◽

Layer Graphene ◽

Potential Applications ◽

Cvd Growth

Recently, oxidized chemical vapor deposition (CVD) growth graphene has drawn much attention due to its potential applications in the field of optoelectronics. In this article, we report a simple, scalable and efficient method to synthesize oxidized CVD growth single-layer graphene by the strong acid treatment. The results indicate that oxidation process successfully introduced more defects and oxygen-containing groups into the lattice of graphene.

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