Graphene Oxide Paper Research Articles

Exploration of the temperature-dependent correlations present in the structural, morphological and electrical properties of thermally reduced free-standing graphene oxide papers

We report on a corroborative study of the structural, morphological and electrical property alterations of free-standing graphene oxide (GO) papers subject to thermal reduction. Structural analysis performed using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and Raman techniques prove that the onset of major structural changes, characterized by removal of oxygen functionalities, occur in the 200–300 °C temperature range. The results are corroborated with related morphological changes observed using Scanning electron microscopy (SEM) and Atomic force microscopy (AFM) imaging. Elemental analysis shows the GO paper reduced at 600 °C to contain an 85 wt. % carbon content and a remnant oxygen level of 13.31 wt. %. At the highest reduction temperatures, we see evidence of vacancy-type defects impeding the overall effectiveness of the reduction process. Detailed electrical resistance measurements and current–voltage (I-V) profiling conducted using four-point probe method reveals a several orders of magnitude drop in the sample resistance once the reduction temperature exceeds 200 °C, in good agreement with the structural and morphological changes. The fundamental insights revealed through these studies will be important for future applications where the electrical and mechanical properties of free-standing GO and reduced graphene oxide (rGO) are exploited in practical devices.Graphical abstract

Rational design of multi-walled carbon nanotube-reduced graphene oxide hierarchical porous paper toward superior electromagnetic interference shielding

The ever-intensifying electromagnetic (EM) pollution drives the intense demand for EM shielding materials. Through evaporative self-assembly and hydrazine hydrate vapor reduction strategy, intricate multiwalled carbon nanotube (MWCNT) ingeniously anchors on the porous reduced graphene oxide (RGO) paper. The synthesized MWCNT-RGO composite paper manifests a better EMI shielding performance compared with pure RGO. Typically, S5-15 (5 wt% MWCNT, 15 g mixture) furnishes the maximum electromagnetic shielding effectiveness up to 47.88 dB with a thickness of 1.04 mm in the X band. These ingenious bicomponent microstructures possess abundant heterointerfaces and defects. Consequently, they synergistically balance the impedance matching, and contribute to conduction loss, polarization relaxation and multiple reflection and scattering. This work supplies the inspiration for the facile preparation of carbon composite with high EM shielding efficiency and thin lamellation by consolidating MWCNT and RGO to form porous heterostructure.

Foldable and scrollable graphene paper with tuned interlayer spacing as high areal capacity anodes for sodium-ion batteries

Bulk graphitic carbon materials with expanded interlayer spacing and abundant defects may serve as efficient anodes with high areal capacities for sodium-ion batteries (SIBs). However, obtaining long-range order in bulk graphitic carbon materials with expanded interlayer spacing is extremely difficult. Herein, an explosive decomposition method is demonstrated to realize thermally reduced graphene oxide (rGO) paper with tuned interlayer spacing. The in-situ temperature-dependent X-ray diffraction (td-XRD) was utilized to establish the correlation between heating rate and interlayer spacing. Based on td-XRD results, free-standing graphene paper (FSG) was synthesized at 450°C under a high heating rate of 70°C/min. The FSG exhibits a highly porous structure made of graphene flakes with abundant surface epoxy groups with an overall interlayer spacing of 0.38–0.39 nm. The rGO flakes in FSG are separated by large voids that provide fast mass transport pathways and allow expansion/contraction of crystallites upon reversible Na intercalation. The FSG was utilized directly as anodes without any binder and conductive agent and delivered an excellent reversible capacity of 290 mAh/g at a current density of 50 mA/g. Moreover, the FSG exhibited excellent foldability and rollability to create high areal density anodes, delivering an areal capacity of 0.62 mAh/cm2 at a current density of 100 μA/cm2. These results open the door to fabricate graphene material-based carbon anodes with tunable interlayer spacing for high-performance SIBs.

Self-assembled graphene oxide-based paper/hollow sphere hybrid with strong bonding strength

Graphene-based nanomaterials possess broad applications because of their excellent multi-functional properties. In this work, a facile self-assembling method was presented for preparing one kind of graphene oxide-based paper/hollow microspheres hybrid. It was found that most of the hollow microspheres can strongly anchored on the surface of graphene oxide paper (GOP) by an in-situ scanning electron microscope peeling testing combining with molecular dynamics (MD) simulation. In addition, the uniform distribution of hollow microspheres on the surface of GOP cannot only provide a better surface wettability, but also can effectively improve the interfacial stress-transfer capability between such hybrid and polymer matrix. Our work provides a guidance for the structural designs of graphene-based nanomaterials and broaden their applications.

Electromagnetic shielding, resistance temperature-sensitive behavior, and decoupling of interfacial electricity for reduced graphene oxide paper

Electromagnetic shielding behavior, resistance temperature-sensitive behavior, interfacial electricity, and their variations with heating treatment of the reduced graphene oxide (RGO) paper are of concern. Herein, self-assembling RGO papers were prepared by solution-phase deposition method. An electromagnetic shielding efficiency (EMSE) of 64 dB shielding (corresponding to a SE/Grammage of 7032 dB/(g/cm2)) covering X-band (8–12 GHz) were obtained. In addition, resistance temperature-sensitive behavior of RGO paper is investigated, and equivalent circuit model is established to decouple interface electricity. The relative resistance variations of RGO paper is caused by the temperature, and the value of ∆R/R0 drops by around 36% when the RGO paper temperature increase from 200 °C to 800 °C. This graphene-based paper provides a simple experimental approach to prepare graphene papers with remarkable electromagnetic shielding performances. More importantly, a qualitative decoupling analysis method is provided for the study and analysis of interfacial electricity. These results and decoupling method can provide useful data and method for carbon-based microwave blockers, sensors and other technologies.

High-strength reduced graphene oxide paper prepared by a simple and efficient method

High-strength reduced graphene oxide paper prepared by a simple and efficient method

Facile fabrication of porous fire-resistant graphene macro-assembly with outstanding electromagnetic interference shielding performance

Free-standing bifunctional reduced graphene oxide paper (RGOP) was facilely fabricated by evaporative self-assembly and hydrazine hydrate vapor reduction. The RGOP integrates remarkable fire resistance and outstanding electromagnetic interference (EMI) shielding performance with a total shielding effectiveness value of 41.5 dB at 0.49 mm thickness in the X band. This research provides a facile pathway to fabricate graphene macro-assembly for fire safety and EMI shielding applications.

Self-Circulation Oxygen-Hydrogen Peroxide-Oxygen System for Ultrasensitive Cathode Photoelectrochemical Bioassay Using a Stacked Sealed Paper Device.

In this work, a self-circulation oxygen-hydrogen peroxide-oxygen (O2-H2O2-O2) system with photogenerated electrons as fuel and highly active hemin monomers as operators was engineered for ultrasensitive cathode photoelectrochemical bioassay of microRNA-141 (miRNA-141) using a stacked sealed paper device. During the circulation, the photogenerated electrons from BiVO4/Cu2O photosensitive structures assembled on a reduced graphene oxide paper electrode first reduced the electron acceptors (dissolved O2) to H2O2, which was then catalytically decomposed by hemin monomers to generate O2 again. The regenerated O2 continued to be reduced, which made O2 and H2O2 stuck in the infinite loop of O2-H2O2-O2 accompanied by the fast consumption of photogenerated electrons, generating an amplified photocurrent signal. When a target existed, a duplex-specific nuclease-induced target recycling reaction with dual trigger DNA probes as the output was performed to initiate the assembly of bridge-like DNA nanostructures, which endowed the self-circulation system with dual destruction functions as follows. (i) Reduced fuel supply: the assembled DNA bridges acting as a negatively charged barrier prevented the photogenerated electrons from participating in the O2 reduction to H2O2. (ii) Incapacitation of operators: DNA bridging induced the dimerization of hemin monomers linked on the DNA hairpins to catalytically inactive hemin dimers, leading to the abortive regeneration of O2. These destruction functions resulted in the circulation interruption and a remarkably decreased photocurrent signal. Thus, the developed cathode photoelectrochemical biosensing platform achieved ultrasensitive miRNA-141 detection with a linear range of 0.25 fM to 1 nM and a detection limit of 83 aM, and it also exhibited high accuracy, selectivity, and practicability.

Quantum-confined-superfluidics-enabled moisture responsive graphene oxide papers

Quantum-confined-superfluidics-enabled moisture responsive graphene oxide papers

Octahedral Cuprous Oxide Decorated Flexible Reduced Graphene Oxide Paper for Food Sensing Application

AbstractThis work presents a simple method to fabricate an octahedral cuprous oxide (Cu2O) decorated two‐dimensional (2D) flexible rGOP electrode with filtration and electrodeposition strategies. The characteristic of the Cu2O/rGOP electrodes was recorded by SEM, EDX, XPS, XRD, and Raman spectroscopy. The results clearly showed that Cu2O was successfully electrodeposited on the surface of rGOP by controlling the electrodeposition potential without the introduction of any template or surfactant. The electrochemical characterizations of the Cu2O/rGOP exhibited high electrocatalytic activity toward the reduction of H2O2. The linear detection range for the Cu2O/rGOP flexible sensor was 5.0 μM to 5.5 mM, with a limit of detection of 1.27 μΜ. Subsequently, the developed flexible rGOP sensor was extended for H2O2 detection in milk samples for avoiding milk spoilage. Such judicial preparation of rGOP as a sensing device will certainly pave the way for various other sensing applications including environmental and biomedical applications.

Coherency between thermal and electrical transport of partly reduced graphene paper

By continuously varying the structure of graphene oxide paper (PRGP) using Joule heating annealing, we are able to tune its electrical conductivity (σ) and thermal diffusivity (α) in a very wide range: more than three orders of magnitude for σ (186–503009 S/m) and 10-fold for α (8.31 × 10−7 m2/s to 9.31 × 10−6 m2/s). Excellent coherency-linear relationship between σ and α is discovered although they are sustained by different carriers: electrons and phonons. Such coherency exists over two sections: σ > 2 × 104 S/m, and 103<σ < 2 × 104 S/m. A two-component parallel structure is proposed to interpret the observed discovery. The slope of α∼σ relation reflects the ratio of difference in α between the two components over σ of the ordered structure. The intercept of α∼σ relation reflects the α of the disordered structure. It is found the α of disordered structure in our PRGP agrees well with that of amorphous carbon. Past work on carbon nanocoil, graphene paper, graphene oxide film, and graphene fiber also reveals linear coherency between α and σ. However, there are no uniform slope and intercept while they are close for similar materials. The parameters of the linear coherency strongly depend on the two structures in the material.

Fabrication of Reduced Graphene Oxide Paper Doped with Zinc Oxide Nanoparticles as Flexible Electrode Material

The conventional electrodes like glassy carbon electrode and graphite are restricted for large-scale electrochemical production and in-vivo applications. Therefore, flexible electrodes are beginning to replace with such electrodes. This work reports a simple preparation of flexible paper-like electrode material (FPEM) including reduced graphene oxide (rGO) and zinc oxide nanoparticles (ZnONPs) for possible electrochemical applications. For this purpose, graphene oxide dispersion was interacted with ZnONPs, filtered under vacuum effect through a membrane, peeled off the membrane and then reduced by hydrothermal reduction process. This FPEM was performed as working electrode for some redox processes and results revealed that rGO/ZnONPs paper allows a large potential region in acidic, basic, and neutral media for electrochemical processes.

Preparation of phase change material filled hybrid 2D/3D graphene structure with ultra-high thermal effusivity for effective thermal management

Graphene-based energy storage and renewable material has increasingly attracted research interest, due to its high thermal conductivity and light weight. Researchers fill phase change material (PCM) into three-dimensional graphene foam, to obtain a composite with high energy storage capability and moderate thermal conductivity. However, this kind of composite's heat transfer mode is single and cannot maximize the advantages of graphene. Herein, a stearic acid filled graphene-foam composite (GFSAC) connected with graphene paper (GP) through gravity-assisted wetting attaching process is demonstrated in this paper.•GP is obtained by thermal reduction of graphene oxide (GO) paper. Its in-plane thermal conductivity can reach up to 938 Wm−1 K−1. By controlling the preparation process of GO paper, the in-plane thermal conductivity of GP can be adjusted.•GFSAC is consisted of GF and SA, GFSAC with different heat transfer properties can be prepared by adjusting the degree of reduction of GF.•A novel gravity-assisted wetting attaching process has been developed to prepare GP/GFSAC/GP composite, which can effectively reduce the thermal resistance between GP and GFSAC.The effective thermal effusivity of the final GP/GFSAC/GP composite reaches 18.45 J cm−3/2 m−1/2 s−1/2 K−1/2, showing an excellent thermal management capability.

The structure and resistance characteristic of reduced graphene oxide paper under atomic oxygen exposure

To study the effects of low earth orbit (LEO) environment on film surface structure and resistance characteristics, reduced graphene oxide paper (rGOP) was irradiated by atomic oxygen (AO) in ground‐based simulation facility. A rough pits surface, chemical oxidation, and change in lamina thickness were found after AO exposure. The erosion yield under AO attack changed from 3.56 × 10−25 to 4.04 × 10−25 cm3/atom. The resistance data exhibited a linear relationship between R0/R and AO fluence, and the maximum AO detect fluence reached to 5 × 1019 atom/cm3 when rGOP thickness was 0.8 μm, which implies that greater thickness is expected to improve space service life of rGOP.

Solvent-free functionalization of graphene oxide powder and paper with aminobenzo-crown ethers and complexation with alkali metal cations

Graphene oxide powder and graphene oxide paper were covalently functionalized with the 4′-aminobenzo-15-crown-5 (AB15C5) and 4′-aminobenzo-18-crown-6 (AB18C6) ethers by a solvent-free gas-phase treatment. Then, we attempted the complexation with potassium and sodium cations. A comparative characterization in the functionalized graphene oxide structures was carried out using Fourier-transform infrared (FTIR), Raman and X-ray photoelectron spectroscopy (XPS), thermogravimetric and differential thermal analysis (TGA and DTA, respectively), scanning electron microscopy (SEM), and atomic force microscopy (AFM). The wettability of graphene oxide paper (GOP) samples was analyzed by measuring the contact angle. The degree of covalent functionalization in GO powder with aminobenzo-crown ethers was estimated at 27% (AB15C5) and 19% (AB18C6). The amount of organics attached to GOP samples was approximately 7%. After the interaction with potassium and sodium cations, the functionalized GOP samples showed an increase in the contact angle, followed by a decrease in surface free energy. The complexation with alkali metal cations suggests an uptake of about 3%. However, the cation selectivity for alkali metal ions was dependent on the ions' radius. Surface free energy measurements suggest that complexation with potassium effectively takes place when using AB18C6.

Carbon Black and Reduced Graphene Oxide Nanocomposite for Binder-Free Supercapacitors with Reduced Graphene Oxide Paper as the Current Collector.

Reduced graphene oxide (rGO) is an ideal candidate for the improvement of supercapacitor (SC) performances due to its industrial-ready manufacturing process and ease of processing. In this work, rGO was used as an active binder for the manufacture of carbon black (CB) and rGO-based SCs. Being able to form a stable suspension in water, graphene oxide (GO) was initially exploited as a dispersing agent to fabricate a homogeneous slurry with CB having exclusively water as a low-cost and environment-friendly solvent. After casting on a suitable substrate, the material was subjected to thermal treatment allowing the reduction of GO to rGO, which was successively confirmed by chemical–physical analysis. An innovative current collector, consisting of high-quality rGO paper, was also proposed ensuring an improved adhesion between the active material and the substrate and a reduction of the whole weight with respect to devices fabricated using common metallic current collectors. Due to the interesting electrochemical performances, with a high specific power of 32.1 kW kg–1 and a corresponding specific energy of 8.8 Wh kg–1 at a current of 1 A g–1, and the improved manufacturing process, the described “all-graphene-based” device represents a valuable candidate for the future of SCs.

The Construction and Testing of an Amperometric Biosensor for Oxidized Glutathione with Glutathione Reductase Immobilized on Reduced Graphene Oxide Paper Modified with Cobalt Sulphur

AbstractThe aim of this study is to build and test an amperometric biosensor to determine oxidized glutathione (GSSG). The biosensor is based on glutathione reductase (GR), which was immobilized onto the surface of reduced graphene oxide (rGO) modified with cobalt sulfide (CoS2). CoS2 nanostructures on the composite paper surface are active centers for immobilizing the GR enzyme. The conversion of GSSG into reduced glutathione was monitored with voltammetry in the presence of nicotinamide adenine dinucleotide phosphate reduced form (NADPH) on the GR‐CoS2/rGO immobilized electrode surface. The biosensor's cyclic volt response is linearly correlated with GSSG concentrations of 0.01–500 μM in a 0.1 M pH 7.4 phosphate‐buffer solution (PBS). The performance of the sensor was high, with a detection limit of 0.48 μM and a sensitivity of 0.6 mA μM cm−2. Four human blood samples were tested for GSSG with both the biosensor and Ellman's assay, which showed nearly identical results, confirming the biosensor's reliability.

Facile and Diverse Graphene Manufacturing from Proprietary Arc Discharge Process

Low cost, low defect and high-quality graphene have been produced in three simple exfoliation steps as a fully tested commercial concept. Low energy thermal arc-discharging expands the electrolytic graphite rod electrodes into hierarchical-like 3D graphene retaining the graphite structural order on a basal plane and chemical purity. Multi-size ball milling causes movement of the graphene materials in multi-shear directions, with optimized speed of the balls and lesser time. Micro-waving further separates the graphene sheets by “thermal expansion and release” mechanism utilizing thermally induced lattice vibrations. This also causes higher lattice order on basal plane improving directional and surface properties. The produced graphene (XRD 2theta = 26 degrees) has low defect (I(D)/I(G) between 0.05 and 0.2), retains chemical purity (between 0.56 and 2.4% change in oxygen content), and with comparatively optimized effective nano-sizes (ranging from 300nm to 35um). These properties make the graphene suitable for diverse applications, dispersibility in various solvents, conformability to flat semitransparent surfaces, and storable in concentrated slurries (>50 mg mL−1) or powder. Keywords: Low Defect; 2D Planar; Arc Discharge Graphene; PPC Sonication; 5 Sec Microwaving; Exfoliation; Electronics.References O.J. Dada, " In-Situ Electrochemical Functionalization of Reduced Graphene Oxide: Positive Lead Acid Case. " ECS Trans., vol. 66, no. 14, pp. 19–30, Aug. 2015.O.J. Dada, “ In-Situ Electrochemical Functionalization of Reduced Graphene Oxide: Positive Lead Acid Case.,” ECS ., MA2015-01 (870), April 2015.O.J. Dada and D. Villaroman, " Superior Electronic and Dielectric Properties of Corrugated ElectrochemicallyReduced Graphene over Graphene Oxide Papers " Journal of the Electrochemical Society, vol 166 no.2, pp D1-D16, 2019.O.J. Dada, " Functional Cathodic and Anodic Transition of Graphene Oxide Paper in Lead Acid Battery System and Its Electrochemistry ". Materials Today: Proceedings”, vol. 3, no. 8, 2688-2697, 2016.O.J. Dada, " Interconnected Graphene Networks as Novel NanoComposite for Optimizing Lead Acid Cathode ". IEEE NANO 2015- Int. Conf. Nanotechnology, Rome, 2015.O.J. Dada, " Higher Capacity Utilization and Rate Performance of Lead Acid Battery Electrodes Using Graphene Additives ”. Journal of Energy Storage, vol. 23, pp579-589, Jun. 2019.O.J. Dada, " Effect of the Size and Conductivity of Tailored Graphene Electro-Catalysts, Lead Acid Battery Cathode as a Case ". IEEE NANO 2015- Int. Conf. Nanotechnology, Rome, Italy, 2015.O.J. Dada, " Wrinkled Graphene Oxide Synthesis by Electrolytic Arc Discharge of Graphite Rods and Slightly Modified Hummer’s Process ". Available at SSRN 3368351, 2019.O.J. Dada, " Highly Ordered Commercial Graphene Manufactured from 3 Simple Steps ". Available at SSRN 3335369, 2019.O.J. Dada, " Low Defect Planar Graphene Exfoliation by Sonication in Polypropylene Carbonate and 5 sec Microwaving ". Available at SSRN 3386581, 2019.O.J. Dada, " Utilization of Hard Carbon as a Substitute for Graphite As Efficient Lithium Battery Anode Material ". Available at SSRN 3368403, 2019.O.J. Dada, “ High Performance Lithium Battery Anodes from Non-Water based Graphene ”. Available at SSRN 3368433, 2019.O.J. Dada, “ Free Standing Porous Graphene and Reduced Graphene Papers Manufactured from Sedimentation of Arc Discharge of Graphite Rods ”. Available at SSRN 3481786, 2019.O.J. Dada, " Corrigendum to “Higher capacity utilization and rate performance of lead acid battery electrodes using graphene additives” . Journal of Energy Storage, vol. 23, pp579–589, Jun. 2019.

Wrinkled Graphene Oxide Synthesis By Electrolytic Arc Discharge of Graphite Rods and Slightly Modified Hummer’s Process

Wrinkled Graphene Oxide has been produced from both glow electrolytic thermal arc discharging of graphite rods combined with hummer’s process. Wrinkling in GO was enhanced by low defects, multilayer clusters, and variegated-edge interaction amongst graphene clusters. The composition of GO was confirmed by XPS, while the low defect level clearly marked by higher planar order and low ID/IG band. The GO morphology is captured by optical microscope and TEM. While arc discharge maintains the graphitic quality of the GO, the slightly modified hummer’s process did not introduce as much defects as the GO used in previous works. The wrinkled GO dispersion is optimal for quenching for DNA biosensors, and it is also applicable for similar high volume and high storage modulus epoxy composites, and other diverse materials and energy applications.REFERENCES -O. J. Dada, " In-Situ Electrochemical Functionalization of Reduced Graphene Oxide: Positive Lead Acid Case. " ECS Trans., vol. 66, no. 14, pp. 19–30, Aug. 2015-O. J. Dada, “ In-Situ Electrochemical Functionalization of Reduced Graphene Oxide: Positive Lead Acid Case.,” ECS ., MA2015-01 (870), April 2015.-O. J. Dada and D. Villaroman, " Superior Electronic and Dielectric Properties of Corrugated ElectrochemicallyReduced Graphene over Graphene Oxide Papers " Journal of the Electrochemical Society, vol 166 no.2, pp D1-D16, 2019.-O. J. Dada, " Functional Cathodic and Anodic Transition of Graphene Oxide Paper in Lead Acid Battery System and Its Electrochemistry ". Materials Today: Proceedings”, vol. 3, no. 8, 2688-2697, 2016.-O. J. Dada, " Interconnected Graphene Networks as Novel NanoComposite for Optimizing Lead Acid Cathode ". IEEE NANO 2015- Int. Conf. Nanotechnology, Rome, 2015.-O. J. Dada, " Higher Capacity Utilization and Rate Performance of Lead Acid Battery Electrodes Using Graphene Additives ”. Journal of Energy Storage, vol. 23, pp579-589, Jun. 2019.-O. J. Dada, " Effect of the Size and Conductivity of Tailored Graphene Electro-Catalysts, Lead Acid Battery Cathode as a Case ". IEEE NANO 2015- Int. Conf. Nanotechnology, Rome, Italy, 2015.-O. J. Dada, " Wrinkled Graphene Oxide Synthesis by Electrolytic Arc Discharge of Graphite Rods and Slightly Modified Hummer’s Process ". Available at SSRN 3368351, 2019.-O. J. Dada, " Highly Ordered Commercial Graphene Manufactured from 3 Simple Steps ". Available at SSRN 3335369, 2019.-O. J. Dada, " Low Defect Planar Graphene Exfoliation by Sonication in Polypropylene Carbonate and 5 sec Microwaving ". Available at SSRN 3386581, 2019.-O. J. Dada, " Utilization of Hard Carbon as a Substitute for Graphite As Efficient Lithium Battery Anode Material ". Available at SSRN 3368403, 2019.-O. J. Dada, “ High Performance Lithium Battery Anodes from Non-Water based Graphene ”. Available at SSRN 3368433, 2019.-O. J. Dada, “ Free Standing Porous Graphene and Reduced Graphene Papers Manufactured from Sedimentation of Arc Discharge of Graphite Rods ”. Available at SSRN 3481786, 2019.-O. J. Dada, " Corrigendum to “Higher capacity utilization and rate performance of lead acid battery electrodes using graphene additives” . Journal of Energy Storage, vol. 23, pp579–589, Jun. 2019.

Free Standing Porous Graphene and Reduced Graphene Papers Manufactured from Sedimentation of Arc Discharge of Graphite Rods

Free Standing Porous Graphene and Reduced Graphene Papers manufactured from Sedimentation of Arc Discharge of Graphite Rods. At SignEcoTech, novel and newer nano-carbons such as hard carbons, homogenized graphene, low defect highly crystalline graphene’s, and wrinkled graphene [1-14]. Here, Graphene Oxide papers have been synthesized previously by flow-directed assembly, where the pressure of air within the assembly supports graphene oxide sheets in their nano-crystalline colloidal solution being filtered on nano-porous filter paper. However in this research, we haven’t used any filter paper, or directed flow assembly, but sedimentation of the colloidal solution in ethyl alcohol in a dish. Then, the wrinkled the hierarchical GO sheets fall under gravity by sedimentation. Wrinkling in GO was enhanced by low defects, multi-layer clusters, and variegated + edge interaction amongst graphene clusters, as such the sedimented graphene papers were porous, intertwined and free standing. The composition of GO was confirmed by XPS, while the low defect level clearly marked by higher planar order and low ID/IG band. The wrinkled, multilayer clusters and carbonic surface properties of the graphene oxide sheets enhanced fast sedimentation, evaporation of the alcohol and formation of porous GO structure. The porous reduced\\GO morphology is captured by optical microscope. Keywords: Wrinkled GO Papers, Reduced Graphene, Arc Discharge, Modified Hummers Method