Aug 17, 20 the electronic and chemical properties of reduced graphene oxide rgo can be modulated by chemical doping foreign atoms and functional moieties. Reduced graphene oxide rgo is a known semiconductor. We supply reduced graphene oxide rgo in powder form, dispersed, or as a coating on substrates. Sno2 aerogelreduced graphene oxide rgo nanocomposites were synthesized using the solgel method. Iodidereduced graphene oxide with dopantfree spiro. Facile synthesis of sno2 aerogelreduced graphene oxide. Solvent free mechanochemical reduction of graphene oxide dong wook chang a,1, hyunjung choi b,1, inyup jeon b, jeongmin seo b, liming dai c, jongbeom baek b, a department of chemical systematic engineering, catholic university of daegu, hayang, gyeongbuk 712702, south korea. The disadvantage is that it is not pristine without defects the advantage of rgo over grapheneoxide is that it is c. In this paper, graphite oxide was prepared from natural flake graphite by hummers method through liquid oxidization, and the reduced graphene oxide was obtained by chemical reduction of graphene oxide using nh 3 h 2 o aqueous solution and hydrazine hydrate. However, being hydrophilic, graphite oxide disperses readily in water, breaking up into macroscopic flakes, mostly one layer thick. In addition, dramatic enhancement of corrosion resistance via reduced graphene oxide rgo coatings under fuel cell operating conditions has been reported.
The advantage rgo has over graphene is that it can be stored longer without agglomeration. Pdf this paper describes a novel approach to the preparation of reduced. Pdf graphene has attracted great interest for its excellent mechanical, electrical, thermal and optical properties. Reduced graphene oxide an overview sciencedirect topics.
Atomic structure of reduced graphene oxide maxplanckinstitut. These are some examples of our recent publications. A composite structure based on reduced graphene oxide and. Flexible high energy density zincion batteries enabled by. Finally, the selfcharging system has been assembled using pvdfsodium niobate energy harvester, and pvdfreduced graphene oxide ssc energy storage and the selfcharging capability is investigated. Waferscale films as thin as 4 nm are sufficiently robust that they can be delaminated intact and resuspended on a bed of pillars or field of holes. Reducing graphene oxide to produce reduced graphene oxide hitherto referred to as rgo, is an extremely vital process as it has a large impact on the quality of the rgo produced, and therefore will determine how close rgo will come, in terms of structure, to pristine graphene. This book focuses on a group of new materials labeled graphene oxides. We demonstrate a rechargeable zincion battery with high energy density and cyclability using mno2 and reduced graphene oxide mno2rgo electrode. So in the reduced graphene oxide there is always some defects and even though we try to reduce the graphene oxide, there are still some oxygen functional groups in or on the reduced graphene oxide. Research institutions across the globe are looking for ways to redefine the development of highquality graphene sheets. Graphene oxide reduction recipes, spectroscopy, and. Photoconductivity of reduced graphene oxide and graphene.
In this work, sulphurdoped reduced graphene oxide srgo sponges, which are used as free standing anodes for kibs, are obtained via simple freezedrying of graphene oxide solution and subsequent thermal treatment in sulphur steam. Freestanding pvdfreduced graphene oxide film for allsolid. In this work, fluorine, nitrogen, and sulfur tridoped reduced graphene oxide f,n,srgo is designed to combine these catalytically active sites. Graphite oxide, formerly called graphitic oxide or graphitic acid, is a compound of carbon, oxygen, and hydrogen in variable ratios, obtained by treating graphite with strong oxidizers. Solventfree mechanochemical reduction of graphene oxide into. Quasisolid state rechargeable naco2 batteries with. Co3v2o8 cvo with high theoretical specific capacity derived from the multiple oxidation states of v and co is regarded as a potential electrode material for lithiumion batteries libs. The acidic nature ph23 of the unwashed graphene oxide will significantly deteriorate the results of its applications. Simultaneously fulfilling good ambient stability and high efficiency, this work proposes the use of a ptype and highly conductive reduced graphene oxide rgo reduced by ferrous iodide acid solution, combined with dopant free spiroometad as a hole extraction and transport material in perovskite solar cells, achieving a maximum power. Finally, the selfcharging system has been assembled using pvdfsodium niobate energy harvester, and pvdf reduced graphene oxide ssc energy storage and the selfcharging capability is investigated.
Among them, the chemical reduction of go into reduced graphene oxide rgo has been the most widely investigated approach to gnps with a good. Reduced graphene oxide rgo is the form of go that is processed by. Applications of graphene oxide and reduced graphene oxide. The hybrid is synthesized by onestep hydrothermal method but exhibits excellent lithium and sodium storage performances. All books are in clear copy here, and all files are secure so dont worry about it.
A thermal reduction can be done by thermal annealing at elevated temperatures in an oxygenfree environment or by lessconventional methods such as. Reducing graphene oxide to produce reduced graphene oxide hitherto referred to as rgo, is an extremely vital process as it has a large impact on the quality of the rgo produced, and therefore will determine how close. A synergistic, nanoscale electrical interface with the membranes of exoelectrogenic microbes will have a transformative impact on biological cellbased electronic devices. Graphene oxide is a form of graphene that includes oxygen functional groups, and has interesting properties that can be different than those of graphene. Synthesis, characterization and enhanced antimicrobial. A linker free connected reduced graphene oxide cdse nanoparticle rgocdse np nanocomposite was produced by directly anchoring cdse nps onto rgo. Waferscale reduced graphene oxide films for nanomechanical. Recently, graphene oxide go or reduced graphene oxide rgo has demonstrated electrochemical and electrocatalytic properties 21, 22.
The sensing properties of the hybrid structure have been studied for different concentrations of ethanol and acetone. Fast and facile preparation of graphene oxide and reduced graphene oxide nanoplatelets. Freestanding pvdfreduced graphene oxide film for all. Graphite oxide prepared by a modified hummers method creates a brown aqueous suspension when dispersed in water as shown in figure 1a. Graphene oxide as a substrate for a variety of chemical transformations, including its reduction to graphenelike materials, is also discussed. By reducing graphene oxide, these oxidized functional groups are removed, to obtain a graphene material. The layers are found to comprise defect free graphene areas with sizes of a few nanometers interspersed with defect areas dominated by.
Pdf graphene has attracted great interest for its excellent mechanical, electrical. Hydrothermal reduction of threedimensional graphene oxide for binderfree flexible supercapacitors. After sulphur doping, our srgo sponges deliver preeminent electrochemical performance. Dramatically enhanced photoresponse of reduced graphene. Templatefree synthesis of carbon hollow spheres and reduced. Therefore, it is advisable to ask a vendor about the ph of the graphene oxide before buying it.
Graphene derivatives, such as graphene oxide go and reduced. Oct 25, 2016 the advantage rgo has over graphene is that it can be stored longer without agglomeration. Solventfree mechanochemical reduction of graphene oxide. The rise in demand for sustainable and carbonfree energy production drives. However, there are still some challenges in further preparation and modification of nrgo. The electronic and chemical properties of reduced graphene oxide rgo can be modulated by chemical doping foreign atoms and functional moieties. A linkerfree connected reduced graphene oxidecdse nanoparticle rgocdse np nanocomposite was produced by directly anchoring cdse nps onto rgo. Read online the effect of functionalized reduced graphene oxide on the. Twothreedimensional reduced graphene oxide coating for.
Microwaveassisted synthesis of spionreduced graphene oxide. The process involved preparation of graphene oxide and its chemical reduction with different reductants to obtain reduced graphene oxide. F,n,srgo can be inexpensively synthesized by a facile and scalable route involving pyrolysis at 600 c of sulfurdoped rgo. Co3v2o8 nanoparticles supported on reduced graphene oxide. Reduced graphene oxide powders can be purchased from ossila either as a chemically reduced powder or thermally reduced powder. Jul 30, 2018 we demonstrate a rechargeable zincion battery with high energy density and cyclability using mno2 and reduced graphene oxide mno2rgo electrode. We report a process to form largearea, fewmonolayer graphene oxide films and then recover the outstanding mechanical properties found in graphene to fabricate high youngs modulus 185 gpa, lowdensity nanomechanical resonators. Full text graphene oxide and reduced graphene oxide induced. Reduced graphene oxides rgos have attracted considerable interest, given their potential applications in electronic and optoelectronic devices and circuits. Graphite oxide itself is an insulator, almost a semiconductor, with differential conductivity between 1 and 5. Ruoff a, a department of mechanical engineering and the texas materials institute, the university of texas at austin, one university station c2200. Synthesis of reduced graphene oxide rgo via chemical reduction article pdf available in aip conference proceedings 16611 may 2015 with 4,443 reads how we measure reads.
Simultaneously fulfilling good ambient stability and high efficiency, this work proposes the use of a ptype and highly conductive reduced graphene oxide rgo reduced by ferrous iodide acid solution, combined with dopantfree spiroometad as a hole extraction and transport material in perovskite solar cells, achieving a maximum power. Research into effective yet inexpensive ways to make derivatives or related materials has attracted tremendous interest. Probing the mechanical properties of verticallystacked ultrathin grapheneal2o3 heterostructures nanotechnology19 february 2019 electrochemically active ir nps on graphene for. Fabrication and characteristics of reduced graphene oxide. Interface of electrogenic bacteria and reduced graphene. The raw material graphite, graphite oxide, and reduced graphene oxide were. Graphene oxide consists of highly oxidized carbon atoms, made by chemical oxidation of graphite. This can be achieved by reducing graphene oxide go to produce reduced graphene oxide rgo. Obvious photocurrents have been detected under bias voltages and light irradiation 1114.
Study of reduced graphene oxide preparation by hummers. For example, it is known that the carbon to oxygen atomic ratio and electrical conductivity of reduced graphene oxide varies depending on chemical identity of the. Synthesis, properties, and applications of graphene oxidereduced. Herein, we report the facile synthesis of carbon hollow spheres chs and reduced graphene oxide rgo from separators and graphite recovered from a spent lithiumion battery lib, respectively, towards a wastetowealth approach. Reduced holey graphene oxide film and carbon nanotubes. Hydrazinereduction of graphite and graphene oxide sungjin park a,b, jinho an a, jeffrey r. In this research, the reducibility of three green reductants, lascorbic acid, dglucose and tea polyphenol, for graphene oxide was comparatively investigated. Our graphene oxide based products were obtained after steps of repetitive washing with a large amount of distilled water. In this work, sulphurdoped reduced graphene oxide srgo sponges, which are used as freestanding anodes for kibs, are obtained via simple freezedrying of graphene oxide solution and subsequent thermal treatment in sulphur steam. Particular emphasis is directed toward the synthesis of graphene oxide, as well as its structure. Probing the mechanical properties of verticallystacked ultrathin graphene al2o3 heterostructures nanotechnology19 february 2019 electrochemically active ir nps on graphene for oer. Reduced graphene oxide rgo is the form of go that is processed by chemical, thermal and other methods in order to reduce the oxygen content, while graphite oxide is a material produced by oxidation of graphite which leads to increased interlayer spacing and functionalization of the basal planes of graphite. Pdf interaction of reduced graphene oxide with free.
Hydrothermal reduction of threedimensional graphene oxide for. Nitrogendoped reduced graphene oxide nrgo is a promising candidate for oxygen reduction reaction orr in fuel cells. Graphite oxide, graphene oxide, and reduced graphene oxide have been prepared and. Highly dispersed como sulfide nanoparticles on reduced.
The photoresponse of this nanocomposite is drastically enhanced. Facile preparation of nitrogendoped reduced graphene. Reduced graphene oxideintercalated graphene oxide nanohybrid. Facile preparation of nitrogendoped reduced graphene oxide. What is the difference between reduced graphene oxide and. Graphene oxide as a substrate for a variety of chemical transformations, including its reduction to graphene like materials, is also discussed. This research studied the synthesis of graphene oxide and graphene via a lowcost manufacturing method. The hybrid is synthesized by onestep hydrothermal method but exhibits.
It not only serves as a precursor for making reduced graphene oxide rgo. The proposed selfcharging system can create a pathway for the allpolymer based composite highperformance selfcharging system. Surfactantfree synthesis of nb2o5 nanoparticles anchored. For high resolution small scale inspection record deltapsi maps and obtain one map of thickness of the sheet. C leads to the reduction of remaining graphene oxide into graphene, while. Pdf synthesis of reduced graphene oxide rgo via chemical. Interaction of reduced graphene oxide with free radicals and silver clusters. The process started with the chemical oxidation of commercial graphite powder into graphite oxide by modified hummers method, followed by the exfoliation of graphite oxide in distilled water using the ultrasound frequency from a laboratory ultrasonic bath. Graphene oxide go, product numbers 763705 and 777676 is a unique material that can be viewed as a single monomolecular layer of graphite with various oxygen containing functionalities such as epoxide, carbonyl, carboxyl and hydroxyl groups. Progress has been made to modify graphene oxide go or rgo samples by compositing other materials that are intended to act as sensitive layer photoconductors. A homogeneous dispersion of graphene oxide go flakes in a tin precursor solution was captured in a threedimensional network sno2 aerogel matrix and successively underwent supercritical alcohol drying followed by the in situ thermal reduction of go, resulting in sno2 aerogelrgo nanocomposites. Jianfeng shen, yizhe hu, min shi, xin lu, chen qin, chen li and mingxin ye.
Sulphurdoped reduced graphene oxide sponges as high. Reduced graphene oxide as saturable absorbers for erdoped passively modelocked fiber laser grzegorz sobon, 1, jaroslaw sotor, 1 joanna jagiello,2 rafal kozinski,2 mariusz zdrojek, 3 marcin holdynski, 4. However, very little is known regarding the chemically induced reduction method of graphene oxide go in both solution. Dramatically enhanced photoresponse of reduced graphene oxide. Potts a, aruna velamakanni a, shanthi murali a, rodney s. This paper reports on the synthesis of reduced graphene oxide. A linkerfree connected reduced graphene oxide cdse nanoparticle rgocdse np nanocomposite was produced by directly anchoring cdse nps onto rgo. Keywords graphene oxide, transmission electron microscopy, defects s ince the discovery of graphene,1 a twodimensional atomic sheet entirely made of carbon, immense efforts have been directed toward the development of reliable methods for obtaining large quantities of this extraordinary material. Templatefree synthesis of carbon hollow spheres and.
Download the effect of functionalized reduced graphene oxide on the. This graphene material is called reduced graphene oxide, often abbreviated to rgo. Based on the previous studies, we newly constructed porous 2d and 3d rgo structures through superheat vaporization of microdroplet svm method. A hybrid nanostructure based on reduced graphene oxide and zno has been obtained for the detection of volatile organic compounds. The chemical reduction of graphene oxide go is the most promising and effective method for the synthesis of reduced graphene oxide rgo because of its relatively large scale and low cost. Here, we report that a conformal graphenic interface on a biocatalytic geobacter sulfurreducens membrane results in quantumcapacitanceinduced ndoping in reduced graphene oxide rgo that further enhances electron. Binder free modification of glassy carbon electrode by.
Iodidereduced graphene oxide with dopantfree spiroometad. Figure 1 shows the obtained graphite oxide, graphene oxide, and reduced graphene oxide suspension in water. Reduced graphene oxide is a form of graphene oxide that has had oxygencontaining groups removed in order to make the flakes more similar in terms of properties to pure graphene. Graphene and graphenebased nanocomposites are used in various research areas. The morphological and structural characterizations evidence that the singlecrystal cdse nps with the size of a few tens of nanometers can be efficiently decorated on the rgo. A homogeneous dispersion of graphene oxide go flakes in a tin precursor solution was captured in a threedimensional network sno2 aerogel matrix and successively underwent supercritical alcohol drying followed by the in situ thermal reduction of go, resulting in sno2 aerogelrgo. The maximally oxidized bulk product is a yellow solid with c. A novel carbon nanotubes cnts and reduced holey graphene oxide film rhgof sandwich structure has been fabricated to enhance its electrochemical properties. This can be achieved by reducing graphene oxide go to. Preparation and characterization of reduced graphene oxide. A lowcost nonexplosive synthesis of graphene oxide for.
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