Aggregation Of Graphene Sheets Research Articles

Boosting the performance of Zn ion hybrid supercapacitors by regulating the chemically and physically active sites of graphene films.

Reduced graphene oxide (RGO) is an ideal material as an electrode used in the electrochemical energy storage field. However, the serious aggregation of graphene sheets and fewer chemically active sites limit it from exhibiting higher performance. Herein, we introduce a facile solvothermal reaction method to simultaneously regulate the functional groups on RGO, balance the aggregation and connection of graphene sheets, and dope the nitrogen element in a graphene network. The obtained electrode (RGO-N(DMF)) has a high content of carbonyl and nitrogen functional groups, and shows a fluffy structure as well as good electron conductivity, exhibiting both high chemically and physically actives sites. Benefiting from these advantages, RGO-N(DMF) shows a high specific capacity of 135 mA h g-1 at 0.2 A g-1 and favorable rate performance of maintaining 53% capacity at 50 A g-1, which are both higher than those of the normal hydrothermally obtained RGO electrodes. More interestingly, RGO-N(DMF) can maintain the high electrochemical performance at a high mass loading of 5.1 mg cm-2. In addition, when the RGO-N(DMF) electrode is used in the flexible Zn-ion hybrid supercapacitor (ZHS), the capacity retention remains at 100% after 500-time bending, showing excellent mechanical flexibility. This study not only provides an effective strategy for constructing carbon-based cathode materials with excellent properties, but also provides prospects and enlightenment for the practical application of aqueous ZHSs.

Reduced graphene oxide/ionic liquid composites with tunable interlayer spacing for improved charge/discharge kinetics in supercapacitors

The large specific surface area and high conductivity of reduced graphene oxide (RGO) make it a promising material for supercapacitors. However, aggregation of graphene sheets into graphitic domains upon drying hampers supercapacitor performance by drastically impeding ion transport inside electrodes. Here, we present a facile approach to optimize charge storage performance in RGO-based supercapacitors by systematically tuning their micropore structure. To this end, we combine RGOs with room temperature ionic liquids during electrode processing to impede stacking of sheets into graphitic structures with small interlayer distance. In this process, RGO sheets function as the active electrode material while ionic liquid serves both as a charge carrier and a spacer to control interlayer spacing inside electrodes and form ion transport channels. We show that composite RGO/ionic liquid electrodes with larger interlayer spacing and more ordered structure exhibit improved capacitance and charging kinetics.

Biocompatible, Electroconductive, and Highly Stretchable Hybrid Silicone Composites Based on Few-Layer Graphene and CNTs.

In this paper, we report a cost-effective and scalable approach to produce highly homogeneous graphene and CNT-based silicone composites with potential applications in diverse fields of research, including biosensors and wearable electronics. This approach includes the fabrication of hybrid fillers based on few-layer graphene and CNTs by water solution blending and manufacturing of graphene/CNT/PDMS composites through calendering in a three-roll mill. The influence of processing parameters, the graphene/CNT ratio, and hybrid filler loading was thoroughly investigated, and the optimal parameters for producing hybrid composites with superior electrical and mechanical properties were found. It was also confirmed that the graphene/CNT hybrid system exhibits a synergistic effect of non-covalent interactions between graphene sheets and CNT sidewalls. This synergistic effect prevents the aggregation of graphene sheets, facilitates the dispersion of graphene and CNTs in the silicone matrix, and contributes to the superior properties of hybrid composites compared to composites with either of these fillers alone.

Nitrogen-doped bagasse carbon spheres/graphene composite for high-performance supercapacitors

Carbon spheres have emerged as a promising material in energy storage, but preparing carbon spheres from raw biomass in a cost-effective way still remains as a great challenge. Here, for the first time, we directly transformed bagasse to nitrogen-doped carbon sphere through hydrothermal carbonization. Before carbonization, bagasse and graphene oxide was fully dissolved in NaOH/urea aqueous system. In the process of hydrothermal carbonization, graphene oxide acted as template and accelerant, and urea was acted as nitrogen source. The diameter of the prepared carbon spheres was about 200 nm, which were distributed on the graphene sheets and acted as spacer to prevent aggregation of graphene sheets. The nitrogen-doped bagasse-based carbon spheres/reduced graphene oxide composite exhibited 3D interconnected structures with high electrical conductivity, large specific surface areas, and active nitrogen-doped sites. Applied as electrode material for supercapacitor, the composite showed a higher specific capacitance, rate capability and better cycling stability compared to some traditional carbon spheres, active carbon and reduced graphene oxide. The specific capacitance is 226.8 F g−1 at the current density of 0.5 A g−1, which still retains 83.9% after 10,000 cycles. After 10,000 cycles, the composite maintains 83.9% of the initial capacitance. Furthermore, the possible formation mechanism of nitrogen-doped bagasse-based carbon spheres/reduced graphene oxide composite was discussed. This study achieved full solubility of bagasse in NaOH/urea aqueous system, not only providing a promising way to convert lignocellulosic raw biomass into carbon spheres directly, but also proposing an emerging strategy for synthesizing high capacitive and stable biomass-based electrode material.

Ionic liquid functionalized 3D graphene-carbon nanotubes‒AuPd nanoparticles‒molecularly imprinted copolymer based paracetamol electrochemical sensor: Preparation, characterization and application

An innovative electrochemical sensor for paracetamol (PCM) determination was fabricated by electropolymerization imprinting on three-dimension (3D) AuPd nanoparticles‒ionic liquid (IL) functionalized graphene‒carbon nanotubes nanocomposite (AuPd/GN-CNTs-IL) modified glassy carbon electrode. The GN-CNTs supported AuPd alloy nanoparticles were prepared via one-pot hydrothermal method in the presence of IL (i.e. 1-hydroxyethyl-3-methyl imidazolium bis[(trifluoromethyl) sulfonyl] imide), which not only promoted the formation of small AuPd alloy nanoparticles, but also acted as “spacer” to prevent the π-π stacking and aggregation of graphene sheets and carbon nanotubes. The resulting composite had large surface area and high electrocatalysis. The PCM imprinted poly(carbazole-co-pyrrole) exhibited good recognition to PCM and had high stability. Based on the synergic effect of PCM imprinted copolymer and 3D AuPd/GN-CNTs-IL nanocomposite, a highly selective and sensitive electrochemical sensor was established. It presented a good linear relationship from 0.10 to 10 μM with a low limit of detection of 50 nM (S/N = 3). The sensor could be applied to the detection of PCM in biological samples, with acceptable recoveries (84.5%–102%). In addition, it was successfully used to monitor the concentration of PCM in urine from a patient with fever cold.

The characteristic and performance of reduced graphene oxide by marine bacterium Pseudoalteromonas sp. CF10-13

Reduced graphene oxide (rGO) has attracted enormous interest because of its excellent physicochemical properties compared to graphene oxide (GO). However, rGO applications are greatly restricted by the aggregation of graphene sheets, risks of sophisticated violent processes, environmental concerns, and high costs of GO reduction. In this study, a mild, eco-friendly, and simplified method for rGO material preparation was developed via a marine bacterium Pseudoalteromonas sp. CF10-13 (CF10-13) under facultative anaerobic conditions. Results showed that bacterial reduced graphene oxide (BRGO) had low oxygen content and decreased interlayer space (d-spacing 0.4 nm). The increased D band to G band ratio was 1.3 and a typical hexagonal crystal structure was observed. The prepared biocompatible three-dimensional hydrogel (BRGO balls) could decolorize both cationic dye (methyl blue) and azo dye (Congo red), with respective efficiencies of 87% and 92% and the equilibrium adsorptions were 72.5 mg/g and 76.0 mg/g at an initial dye concentration of 50 mg/L, respectively. This study provides one operable option for producing BRGO with better physicochemical properties with potential as a wastewater treatment method.

Three-dimensional nanocomposite of graphene/MWCNT hydrogel grafted with Ni–Co hydroxide nanorods as high-performance electrode for asymmetric supercapacitor

Graphene hydrogels with a three-dimensional (3D) structure have attracted attention as electrode materials for energy storage devices due to their macroscopic architecture and freestanding characteristics. In this work, 3D graphene/MWCNT hydrogel (GCH) with a tunable internal structure was self-assembled through chemical reduction and used as an electrode material for supercapacitor. The added MWCNTs prevent aggregation of graphene sheets and increase available active sites. Furthermore, the high conductivity and strength of MWCNTs greatly tuned the structural and physical properties of the hydrogel. Nickel-cobalt hydroxide nanorods were further grafted on GCH scaffold by a hydrothermal method. Due to its good electrolyte accessibility and fast charge transfer, the resulting GCH-NC shows high specific capacity and outstanding rate performance when it is used as electrode material for supercapacitor. For practical applications, asymmetric supercapacitor is fabricated using GCH and GCH-NC as negative and positive electrode materials, respectively. The fabricated asymmetric supercapacitor exhibits excellent performance with an energy density of 0.36 mWh/cm2 and a high power density of 22.6 mW/cm2 (loading mass: 10.6 mg/cm2). Also, this device possesses outstanding cycle stability with capacity retention of 92% after 25,000 cycles at a current density 10 A/cm2. Therefore, the GCH-NC is expected to be a promising electrode material for high-performance supercapacitor.

A novel robust adsorbent for efficient oil/water separation: Magnetic carbon nanospheres/graphene composite aerogel

Recently, graphene aerogels (GAs) have attracted considerable research attention in oil/water separation owing to their remarkable properties. However, the serious stacking of graphene oxide nanosheets (GO) would lead to low adsorption capacity and poor recyclability. For the first time, with alkaline ammonium citrate as reducing agent and nitrogen source, the point-to-face contact between magnetic carbon nanospheres (MCNS) and graphene sheets was adopted to effectively inhibit the aggregation of graphene sheets. Nitrogen-doped magnetic carbon nanospheres/graphene composite aerogels (MCNS/NGA) were fabricated under weakly alkaline conditions by one-step hydrothermal in-situ electrostatic self-assembling strategy. The aerogels have low density, super-elasticity (up to 95 % compression), high specific surface area (787.92 m2 g−1) and good magnetic properties. Therefore, they exhibit adsorption capacity in the range of 187–537 g g−1 towards various organic solvents and oils, superior to most reported materials to date. In addition, thanks to their good mechanical properties, excellent thermal stability and flame retardancy, they can be regenerated by squeezing, distillation and combustion. More importantly, magnetic control technology can be adopted to realize oriented adsorption and facilitate recycling of organic solvents and oils in extreme environments.

Polypyrrole nanospheres@graphene aerogel with high specific surface area, compressibility, and proper water wettability prepared in dimethylformamide-dependent environment

A polar functionalization modification is put forward to prepare polypyrrole nanospheres@graphene aerogel (PPys@GA) with high specific surface area, compressibility, and proper water wettability. Polarity of mixed solutions is regulated by controlling the volume ratio of H2O to N,N-dimethylformamide (DMF) to realize better dispersion of graphite oxide (GO), while PPys prepared by weak oxidant (FeCl2/H2O2) own excellent water wettability and can be easily adsorbed on GO sheets to restrain the aggregation of graphene sheets during the reduction self-assembly process more efficiently than PPys synthesized using strong oxidants. The finally resultant PPys@GA enjoys the advantages of high specific surface area (686 m2 g−1), ultralow density (7.8 mg cm−3), high Young's modulus (45.33 kPa) as well as proper wettability (a contact angle of 86°). And such excellent comprehensive properties for PPys@GA outperform many of their counterparts, which qualifies PPys@GA acting as a promising candidate for extensive applications such as adsorption, catalysis, sensors and energy storage materials.

Nano-Li4Ti5O12 particles in-situ deposited on compact holey-graphene framework for high volumetric power capability of lithium ion battery anode

It is still a considerable challenge for spinel Li4Ti5O12 to achieve high tap density while retaining excellent power capability. Herein, a compact and mesopore-oriented holey-graphene framework (HGF) caging nano-Li4Ti5O12 particles (Li4Ti5O12/HGF) is synthesized by capillary shrink effect. In the capillary drying process, nano-Li4Ti5O12 particles prevent the absolute aggregation of graphene sheets, remaining mesopore-oriented porosity for rapid Li+ diffusion. After precisely adjusting the porous structure, Li4Ti5O12/HGF composite successfully achieves a balance between tap density and porosity. Furthermore, the in-plane nanopores of holey-graphene sheets provide channels for Li+ diffusion, obviously weakening the Li+ diffusion resistances of compact composite. The resultant Li4Ti5O12/HGF composite combines a high tap density of 1.1 g cm−3 and a moderate mesopore-oriented porosity with BET specific area of 152 m2 g−1, delivering volumetric-specific capacities of 161, 142, 120, 103 mA h cm−3 at 0.035, 1.75, 7 and 14 A g−1, respectively. Even as current density reaches 17.5 A g−1, the as-prepared Li4Ti5O12/HGF composite still displays a capacity of 98 mA h cm−3, showing excellent ultrahigh-rate performance. After 1000 cycles at 7A g−1, the capacity of dense Li4Ti5O12/HGF composite remains 84%, demonstrating high cycle stability.

Edge Planes Oriented Electrochemically Exfoliated HOPG for Electrochemical Capacitors

Increase in demand of flexible and portable electronic gadgets, created a market for similar energy storage devices. Freestanding, binder free electrode is the primary component to make such an energy storage device. Graphene, a 2D form of carbon has attracted much attention as an electrode material for supercapacitor applications, because of its properties, like, high surface area and excellent intrinsic electrical conductivity. Scalable, economical synthesis of graphene and its application as an electrode material is still in the development stage. Restacking and aggregation of graphene sheets during electrode fabrication decreases effective surface area for double layer formation. Electrochemical exfoliation of HOPG leads to growth of edge oriented graphene sheets on the surface of HOPG. Controlled electrochemical exfoliation of HOPG electrodes in different electrolytes shows different capacitive performance. This performance variation is related to pH of electrolyte. A maximum aerial capacitance of 760 mF cm-2 at current density of 1 mA cm-2 achieved in electrode exfoliated in 1 M H2SO4 electrolyte.

Electrochemical performance enhancement of flexible graphene supercapacitor electrodes by carbon dots modification and NiCo2S4 electrodeposition

In this work, flexible graphene supercapacitor electrodes were prepared from biomass-derived carbon dots/graphene composite film (CDGF) and hydrogel (CDGH) with/without an electrodeposited NiCo2S4 layer. Results showed that the dispersive CDs with abundant heteroatoms effectively inhibited the aggregation of graphene sheets and increased the number of active sites. By combining CDs modification and NiCo2S4 electrodeposition, the electrochemical performance of the prepared ternary composite electrodes is significantly enhanced. In particular, the CDGF-NiCo2S4 electrode has a specific capacitance of up to 1348 F g−1 at a current density of 0.5 A g−1. The resultant CDGF-NiCo2S4 flexible symmetric supercapacitor using 1.0 M H2SO4 as aqueous electrolyte shows a large specific capacitance (313 F g−1 at 0.5 A g−1) and a high energy density of 85.1 Wh kg−1 at a power density of 353 W kg−1. By contrast, the CDGH-NiCo2S4 flexible solid-state supercapacitor using polyvinyl alcohol (PVA)/H2SO4 as gel electrolyte has improved cycling stability (83.1% capacitance retention after 10000 charging/discharging cycles) and a better mechanical flexibility (96.8% capacitance retention after 1000 bending cycles). This work demonstrates the importance of CDs and metal sulfides in modifying graphene-based composite electrodes for flexible supercapacitor.

Electrochemically Engineered Graphite for Supercapacitor Application

Supercapacitors are also known as electrochemical capacitors (ECs) attracted considerable attention because of properties like high power density, rapid charge-discharge rate (few seconds), long cycle life (>100000 cycles) and low maintenance cost. These properties make EC an excellent candidate for applications like hybrid electric vehicles, frequency regulations in smart grids etc. However, designing freestanding binder-free electrodes with superior mechanical strength and suitable capacitance is still in the development stage. Graphene, a 2D form of carbon is one of the best candidates for supercapacitor electrode material, because of its properties, like, high surface area (~2630 m2 g-1), high intrinsic electrical conductivity, and chemical stability. Restacking and aggregation of graphene sheets during electrode fabrication process leads to ineffective use of its high surface area. Vertically oriented graphene (VOG) sheets on a conductive substrate can be a useful electrode for supercapacitor application. Exposed graphene sheets on the surface of graphite, increases the surface area of the electrode by order of magnitude and reduces the contact resistance since graphene sheets remain attached to the substrate. Here, we demonstrate an electrochemical approach for engineering graphite surface in such a way that we can directly grow vertically oriented graphene on the graphite substrate itself. Electrochemical exfoliation process increases interlayer spacing causing more and easy access to the surface area by electrolyte ions, thus reducing diffusion resistance. Anodization of graphite in 1 M H2SO4 leads to the growth of VOGs on a graphite substrate. Exfoliated graphite (EG) not only act as a current collector but also stores enough charges in the interlayer spaces. EG shows excellent capacitive performance in 1 M sodium sulphate electrolyte. The capacitance of graphite, 0.05 F cm-2 increases to 0.75 F cm-2 (scan rate of 5 mV s-1) in case of EG.

Magnetic nitrogen-doped reduced graphene oxide as a novel magnetic solid-phase extraction adsorbent for the separation of bisphenol endocrine disruptors in carbonated beverages

A novel magnetic nitrogen-doped reduced graphene oxide (Fe3O4@N-RGO) had been fabricated for the first time on the basis of a simple solvothermal method and then was successfully applied to extract four bisphenol endocrine disruptors (bisphenol A, bisphenol B, bisphenol F and bisphenol AP) in carbonated beverages coupled with high performance liquid chromatography (HPLC). The as-prepared Fe3O4@N-RGO was characterized by transmission electron microscopy (TEM), Brunner-Emmet-Teller (BET), X-ray diffraction (XRD), X-ray photoelectron spectrometer (XPS) and vibrating sample magnetometer (VSM). The introduction of nitrogen atoms not only made the wrinkle level of N-RGO increased, but also retarded the irreversible aggregation of graphene sheets. Compared with Fe3O4@RGO, Fe3O4@N-RGO owned larger specific surface area and more adsorption sites. Hence, Fe3O4@N-RGO showed excellent extraction efficiency toward bisphenol endocrine disruptors. The analytical parameters influencing the extraction efficiency were optimized in detail. Under the optimal conditions, a satisfactory performance was obtained. The calibration lines were linear over the concentration in the range of 0.4–1000 μg L−1 with determination coefficients (r2) between 0.9976 and 0.9996. The limits of detection (LOD) ranged from 0.1 μg L−1 to 0.2 μg L−1. The recoveries varied from 86.52% to 101.47% with relative standard deviations (RSDs) less than 8.59%. Overall, the proposed method was an efficient pretreatment and enrichment procedure and could be successfully applied for selective extraction and determination of bisphenol endocrine disruptors in complex matrices.

Tuning polyelectrolyte-graphene interaction for enhanced electrochemical nonenzymatic hydrogen peroxide sensing

Herein, tuning polyelectrolyte-graphene interaction was demonstrated to enhance electrocatalytic activity for non-enzymatic hydrogen peroxide detection. The introduction of positively charged poly(diallyldimethylammonium chloride) (PDDA) onto graphene surface not only prevent the aggregation of graphene sheets through electrostatic repulsion but also create net positive charge on adjacent carbon atoms in the graphene due to the occurrence of the intermolecular charge transfer by virtue of the robust electron-withdrawing ability of PDDA. Notably, we revealed the influence of the adsorbed polyelectrolytes on the redox of H2O2 and the related mechanism was discussed in detail. In a word, the catalytic activities of the graphene could be effectively tuned via the induction of the polyelectrolytes with different attributes. It was expected that this finding could be favorable for the tuning graphene electronic structure and further developing the novel graphene-based electrochemical sensing platforms.

Facile Fabrication of Three-Dimensional Lightweight RGO/PPy Nanotube/Fe3O4 Aerogel with Excellent Electromagnetic Wave Absorption Properties.

In this article, a three-dimensional chemically reduced graphene oxide/polypyrrole nanotubes (PPy nanotubes)/Fe3O4 aerogel (GPFA) was fabricated by a simple one-step self-assembly process through hydrothermal reduction. The addition of both PPy nanotubes and Fe3O4 nanoparticles is aimed to avoid the aggregation of graphene sheets, effectively adjust the permittivity, and make better impedance matching between dielectric loss and magnetic loss of the composite aerogel to gain excellent electromagnetic (EM) wave absorption performance. The EM wave-absorbing results indicate that the ternary composite with an ultralow density of about 38.3 mg/cm3 shows an improved EM wave-absorbing property with a maximum reflection loss of −49.2 dB at the frequency of 11.8 GHz, with an effective absorption bandwidth below −10 dB reaching 6.1 GHz (9.8–15.9 GHz) at a thickness of 3.0 mm. Such an outstanding EM wave absorption behavior can be attributed to the multiple reflections, polarizations, and relaxation processes in the aerogel.

One-step approach for fabrication of 3D porous carbon/graphene composites as supercapacitor electrode materials

In this work, we reported a facile one-step method for fabricating hierarchically porous carbon/graphene composites, which exhibited superior electrochemical performance in supercapacitor as electrode. The preparation was processed in a KCl molten salt at a temperature range of 650–950 °C using soluble low-molecular-weight phenolic resol as carbon source. The structural and morphological characterizations showed that composites possessed a special 3D structure, which consisted of well-dispersive porous carbon particles growing chemically on the graphene sheets. The carbon particles served as spacers to block the aggregation of graphene sheets. This unique structure benefited the penetration/mobility of ions within the composites due to high surface area, abundant micropores/mesopores/macropores, high conductivity of graphene, and strong chemical interaction between porous carbon particles and graphene. The optimal sample offered an outstanding capacitive behavior in the two-electrode and three-electrode system including higher specific capacitance, better rate capability and more stable cycling performance after 5000 cycles. This study opens up a new strategy for developing graphene based electrode material in supercapacitor.

Optimisation of electrolytic solvents for simultaneous electrochemical exfoliation and functionalisation of graphene with metal nanostructures

The development of a simple, simultaneous electrochemical exfoliation and functionalisation of graphene with metal nanostructures in a one-pot, single step process is reported. This approach is useful in terms of the reduction in processing time and cost, as well as aiding the control of the aggregation of graphene sheets. This first part of this work compares the efficiency of electrochemical graphite exfoliation in dimethyl sulfoxide (DMSO), N-methylpyrrolidone (NMP) and in a mixture of dimethyl carbonate (DMC) and ethylene carbonate (EC) in an electrolyte consisting of LiClO4 and tetraethylammonium tetrafluoroborate. In the second part, the best performing electrolytic solvent was used for in-situ functionalisation of graphene sheets with gold or cobalt nanostructures. The formation of solid layer electrolyte interface in the DMC/EC system is believed to stabilise the graphite from premature exfoliation and allowed the ions to intercalate efficiently to produce a relatively high yield of monolayer graphene sheets. By contrast, the electrochemical exfoliation of graphite in the other two solvents (DMSO and NMP) produced lower yields of few layer graphene. In particular, the co-intercalation of DMSO fragments the electrode by its decomposition by-products (sulfur/carbon oxides) before sufficient cation intercalation occurs. The simulations electrochemical exfoliation and functionalisation of graphene at a single applied potential in the presence of Au salt in DMC/EC solution resulted in the functionalisation of graphene sheets with a variety of high surface area Au nanowhiskers, nanodendrites, nanowires and lamellar nanoparticles. Alternatively, the use of Co(II) salt in the exfoliation solution resulted in the co-deposition of uniformly grown Co nanoparticles on graphene sheets. The metal-functionalised graphene sheets showed high catalytic activity and stability when used as an electrocatalyst for hydrogen evolution reactions. This process could be extended to other metal salts, or mixtures of metal salts, to form graphene-metal alloy composites for use in various applications.

Nickel cobalt sulfide anchored in crumpled and porous graphene framework for electrochemical energy storage

Energy storage is becoming highly important as renewable generation sources are added to the mix in electrical power generation and distribution systems. Supercapacitors and batteries could allow renewables to overcome intermittency difficulties by regulating the voltage, frequency, and phase angle of the power. Transition-metal oxide, hydroxide, and sulfide forms, carbonaceous materials, and conducting polymers can be used as electrodes for supercapacitors. Graphene is considered to be a promising material for supercapacitors because of its high surface area and theoretical gravimetric capacitance. However, aggregation of graphene sheets severely decreases the accessible surface area and theoretical gravimetric capacitance. Here we report a unique synthesis route of a hybrid nickel cobalt sulfide anchored in a crumpled and porous graphene framework to address the aforementioned problem. The hybrid sample, a nickel cobalt sulfide/crumpled-porous graphene framework, delivered higher specific capacitance and better electronic conductivity than the porous graphene framework when used as a supercapacitor electrode.

Fabrication of capsaicin functionalized reduced graphene oxide and its effect on proliferation and differentiation of osteoblasts

Herein, we report a new simple and biological approach for the preparation of capsaicin adsorbed reduced graphene oxide (RGO), where capsaicin acts as a stabilizing and deoxygenating agent. The capsaicin that is decorated on graphene surface plays an important role as a capping agent to avoid the aggregation of graphene sheets. The capsaicin functionalized RGO stimulated the differentiation and proliferation of osteoblasts to a larger extent, which is a significant feature for the use of biomaterials in biomedical application such as in bone tissue engineering, more speciafically in the case of diseases such as osteoporosis.