Influence of graphite size on the synthesis and reduction of graphite oxides

Tran, Minh-Hai; Yang, Cheol‐Soo; Yang, Sunhye; Kim, Ick‐Jun; Jeong, Hae Kyung

doi:10.1016/j.cap.2013.11.038

Cited by 24 publications

(11 citation statements)

References 20 publications

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“…Therefore, the pyrrole (N-5) would provide more valence electrons followed by increase of the electrochemical properties. Figure 6 shows the CV results of three different sized samples in acid and base electrolytes, and the data of 20 lm samples were taken from our previous paper [10]. The smaller grain size, the better CV results obtained in both electrolytes as expected.…”

Section: Resultssupporting

confidence: 61%

“…Graphene or reduced graphene oxide from GO made of the precursor graphite of 20 lm has showed much better electrochemical performance for the energy storage applications compared to graphene made from 74 to 149 lm size graphite; Smaller grain size, higher capacitance [10]. It is worth investigating whether graphene or reduced graphene oxide made from the precursor of smaller grain size less than 20 lm could show more improved electrochemical performance or not.…”

Section: Introductionmentioning

confidence: 96%

“…The properties of obtained graphene through GO, however, strongly depend on crystal structure [5] and metallic impurities [6] of precursor graphite, oxidation time of GO [7], reduction methods [8] and temperature [9], and grain size of precursor graphite [10]. Graphene or reduced graphene oxide from GO made of the precursor graphite of 20 lm has showed much better electrochemical performance for the energy storage applications compared to graphene made from 74 to 149 lm size graphite; Smaller grain size, higher capacitance [10].…”

Section: Introductionmentioning

confidence: 99%

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Size dependent electrochemical properties of reduced graphite oxide

Tran

Yang

et al. 2014

Chemical Physics Letters

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Section: Resultssupporting

confidence: 61%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Size dependent electrochemical properties of reduced graphite oxide

Tran

Yang

et al. 2014

Chemical Physics Letters

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“…Based on the literature [ 5 , 7 , 8 , 15 , 16 , 17 ] the kind of graphite and the oxidation/reduction method have large impacts on the kind of functional groups present in the final product (in rGO and GRO). Materials prepared through different methods will have difference properties.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Graphite Oxide and Reduced Graphene Oxide Obtained from Different Graphite Precursors and Oxidized by Different Methods Using Raman Spectroscopy

et al. 2018

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In this paper, the influences of the graphite precursor and the oxidation method on the resulting reduced graphene oxide (especially its composition and morphology) are shown. Three types of graphite were used to prepare samples for analysis, and each of the precursors was oxidized by two different methods (all samples were reduced by the same method of thermal reduction). Each obtained graphite oxide and reduced graphene oxide was analysed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy (RS).

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“…In the literature concerning gaseous sensors much attention is devoted to sensors based on graphene, graphite oxide (GrO) and reduced graphene oxide (RGO) [1][2][3]. There are many different methods of production [4][5][6][7][8] graphene based materials, which undoubtedly affects their structural properties. Our earlier studies [9][10] have shown that the sensor properties of graphene based materials significantly depend on the technology used for their production.…”

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confidence: 99%

The effect of oxidation and reduction processes of graphite on physicochemical properties of graphite oxide and reduced graphene oxide

Drewniak

Pustelny

Muzyka

et al. 2014

Photon. Lett. Poland

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Abstract-Due to the sensitivity of their physical properties to selected gases, graphite oxide (GrO) and reduced graphene oxide (RGO) can be used in optical gas sensors. The sensor properties of GrO and RGO depend significantly on the technology used for their production. In this paper the effects of oxidation and reduction processes on graphite physicochemical properties were presented.In many production processes, but also in environmental monitoring, an important problem is the detection of selected gases with adequate selectivity and sensitivity. Recently, much attention has been paid to the development of optical gas sensors, acting both on the basis of optical absorption and the phenomenon of propagation of modes in optical planar structures. It is important that the detection of selected gases should be unambiguous and at a low level of their concentration. Attention should also be paid to the response time of sensors (time of gas detection), which must be as short as possible. The metrological properties of optical gas sensor structures depend mainly on gas sensing layers. In the literature concerning gaseous sensors much attention is devoted to sensors based on graphene, graphite oxide (GrO) and reduced graphene oxide (RGO) [1][2][3]. There are many different methods of production [4-8] graphene based materials, which undoubtedly affects their structural properties. Our earlier studies [9][10] have shown that the sensor properties of graphene based materials significantly depend on the technology used for their production. In the present paper, the effects were investigated of oxidation and reduction processes on graphite physicochemical properties.The research work presented in this paper was designed to describe changes which take place in graphite after its oxidation and reduction. In order to clarify the description, the product obtained in an oxidation process will be referred as graphite oxide and denoted as GrO while the product obtained in a reduction process will be referred as graphite oxide and denoted as RGO. The * E-mail: sabina.drewniak@polsl.pl oxidation process is intended to incorporate the functional groups containing oxygen, e.g. carbonyl, carboxyl, hydroxyl and epoxy between the planes of graphene. The oxidation process was realized using Hummer's method, the reduction process was realized using a temperature of approximately 900 o C and inert conditions [11]. During the reduction process, the number of additional oxygen and hydrogen groups in GrO decreases, giving the RGO structure. The research presented in this paper was conducted using a sample of graphene flakes. Graphite is characterized as an ordered crystallographic structure and has a high content of mineral substance (at 9.7%). Preparation of graphite oxide:Commercial flake graphite powder (90µm), supplied by Signograf was oxidized by a modified Hummer method [12]. Concentrated H 2 SO 4 (95-97%) was used as an acid and KMnO 4 and NaNO 3. A graphite sample (1g) with a particle size <20μm was mixed with the acid and placed in...

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Influence of graphite size on the synthesis and reduction of graphite oxides

Cited by 24 publications

References 20 publications

Size dependent electrochemical properties of reduced graphite oxide

Size dependent electrochemical properties of reduced graphite oxide

Characterization of Graphite Oxide and Reduced Graphene Oxide Obtained from Different Graphite Precursors and Oxidized by Different Methods Using Raman Spectroscopy

The effect of oxidation and reduction processes of graphite on physicochemical properties of graphite oxide and reduced graphene oxide

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