Facile fabrication of stable monolayer and few-layer graphene nanosheets as superior sorbents for persistent aromatic pollutant management in water

2014 ◽  
Vol 2 (43) ◽  
pp. 18219-18224 ◽  
Author(s):  
Kaijie Yang ◽  
Jun Wang ◽  
Baoliang Chen
Keyword(s):  
Graphene Nanosheets ◽  
Layer Graphene ◽  
Facile Fabrication ◽  
Few Layer Graphene

A facile method was employed to prepare stable monolayer and few-layer graphene (ASG) nanosheets by loading on nanosilica substrates.

scholarly journals Green Synthesis of Clean Edge Graphene Nanosheets Using Natural Precursor

2021 ◽  
Vol 58 (3) ◽  
pp. 210-216
Author(s):  
Balakrishnan Somasekaran ◽  
Alwarsamy Thirunarayanaswamy ◽  
Ilamathi Palanivel
Keyword(s):  
Environmental Concern ◽  
Graphene Nanosheets ◽  
Agricultural Waste ◽  
Chemical Activation ◽  
Advantages And Disadvantages ◽  
Layer Graphene ◽  
Smooth Edge ◽  
Novel Method ◽  
Traditional Approaches ◽  
Few Layer Graphene

Graphene, a two-dimensional crystalline allotrope of carbon, has received greater attention from numerous researchers due to its excellent properties. Graphene could be produced by various techniques, each method has its advantages and disadvantages. In this research article, a novel method using agricultural waste rice husk as a precursor and chemical activation to produce few-layer graphene nanosheets was developed. Traditional approaches significant shortcomings and the environmental concern of agricultural waste have been eliminated. The synthesized material was characterized using FESEM, Raman Spectroscopy, X-Ray diffractometer, UV-Vis absorbance and FTIR analysis. FESEM analysis of the surface morphology revealed smooth edge few-layer graphene. The formation of sp2 hybridized atoms can be seen in XRD spectra at 26.3 degrees. The C=C stretching bonds detected at 1612 cm-1 wavelength are responsible for the graphitic structure.

CN foam loaded with few-layer graphene nanosheets for high-performance supercapacitor electrodes

2015 ◽  
Vol 3 (14) ◽  
pp. 7591-7599 ◽  
Author(s):  
Guoxing Zhu ◽  
Chunyan Xi ◽  
Yuanjun Liu ◽  
Jun Zhu ◽  
Xiaoping Shen
Keyword(s):  
High Performance ◽  
Graphene Nanosheets ◽  
Capacitive Performance ◽  
Layer Graphene ◽  
Few Layer Graphene

A CN–RGO composite with excellent capacitive performance was prepared through a facile and rapid two-step strategy.

Anionic Electrochemical Exfoliation of Few-Layer Graphene Nano-Sheets: An Emphasis on Characterization

2020 ◽  
Vol 978 ◽  
pp. 399-406
Author(s):  
Azmeera Srinivasanaik ◽  
Amlan Das ◽  
Archana Mallik
Keyword(s):  
Graphene Nanosheets ◽  
Pyrolytic Graphite ◽  
Chemical Vapour ◽  
Morphological Structure ◽  
Cost Effective ◽  
Layer Graphene ◽  
Chemical Exfoliation ◽  
Electrochemical Approach ◽  
Probe Spectroscopy ◽  
Few Layer Graphene

Graphene, the most unique member of carbon family has fuelled a huge interest across the globe with its superior mechanical, chemical, optical and electronic properties. It has opened enormous avenues for humankind in terms of different applications. Since its discovery in 2004, people have tried various techniques to extract graphene, such as mechanical exfoliation, chemical exfoliation, epitaxial growth, CVD (chemical vapour deposition) etc. However, the above methods are not optimal for mass production, neither are they simple and cost effective. The present work highlights synthesis of graphene through electrochemical approach and its subsequent characterization. Pyrolytic graphite is subjected to intercalation of two different concentrations of HNO3 electrolyte. XRD, FESEM and TEM were utilised to understand the structure and morphology of the obtained few-layer graphene nanosheets (FLGNs). Scanning probe spectroscopy is a useful technique for understanding the morphological structure of a sample at atomic level. Authors have utilised AFM which shows the thickness of the FLGNs to be in the range of 5-6 nm. STM studies of graphene nanosheets revealed atomic scaled periodicity and atomic flatness.

scholarly journals Synthesis of Clustered Mn3O4 Nanoparticles through a Polymer Surfactant Mediated Route on Few-Layer Graphene Nanoplatelet Surface and its Application for Electrochemical Energy Storage: Lithium-ion Battery Anode

2020 ◽  
Author(s):  
Debkumar Saha ◽  
Lawrence T. Drzal
Keyword(s):  
Electrical Conductivity ◽  
Lithium Ion Battery ◽  
Graphene Nanosheets ◽  
High Surface ◽  
High Surface Area ◽  
Lithium Ion ◽  
Layer Graphene ◽  
Carbon Substrates ◽  
Few Layer Graphene ◽  
Battery Anode

<p>Composites synthesized through the deposition of Mn<sub>3</sub>O<sub>4</sub> on graphene, carbon nanotube and other carbon based materials have attracted much attention recently as potential electrode materials for different electrochemical applications such as pseudocapacitor; Lithium-ion battery; and catalysis. The primary reason Mn<sub>3</sub>O<sub>4</sub> is grown on these substrates in spite of having high charge storage capacity as pseudocapacitor or Lithium-ion battery electrodes on its own is to enhance its electrical conductivity and/or to impart flexibility to the electrode, which is difficult for a fully metallic electrode. Higher electrical conductivity prolongs the cycle life of an electrode. In addition, the substrate contributes capacity and thus, enhances the overall energy density of an electrode. Mn<sub>3</sub>O<sub>4 </sub>acts as a spacer and keeps graphene nanosheets separated when used as the substrate for capacitor electrode fabrication. This helps retain the high surface area of graphene nanosheets in the electrode which contributes additional capacitance. Mn<sub>3</sub>O<sub>4 </sub>supported on graphene and other carbon substrates have recently been investigated as catalyst for methanol electro-oxidation in alkaline media; CO oxidation; and Oxygen reduction reaction (ORR). High surface area substrate uniformly distributes metal particles and prevents their agglomeration and dissolution during catalytic process. In addition, high electrical conductivity of graphene and carbon substrates enhances the electronic conductivity of Mn<sub>3</sub>O<sub>4</sub> which is of importance for superior catalytic activity. Composite of Mn<sub>3</sub>O<sub>4</sub> combined with carbon based substrate has also found non-electrochemical application such as the removal of Pb and Cu ions from aqueous solution because of their adsorptive behaviour.<b></b></p> <p>A myriad of procedures have been adopted for the synthesis of Mn<sub>3</sub>O<sub>4</sub> on graphene or other carbonaceous substrates. All of these methods involve one or more of the following factors that complicate the process, such as: long synthesis time; high synthesis temperature; use of hazardous/toxic chemicals; multistep process and the requirement for sophisticated device or highly controlled environment. In fact, the complicacies associated with the synthesis of Mn<sub>3</sub>O<sub>4</sub> have already been acknowledged and investigations have been directed at finding relatively simpler route such as the use of microwave technique. <b></b></p> <p>In this research, we report the synthesis of clusters of nearly octahedral shapedn Mn<sub>3</sub>O<sub>4</sub> nanoparticles on few-layer graphene nanoplatalet (GnP) surface through a simple, wet-chemical, polyethyleneimine (PEI) mediated route. Few-layer graphene nanoplatelets are ultrathin particles of graphite prepared through proprietary intercalation and exfoliation method (XG Sciences, Inc., Lansing, MI, USA). The components involved in this synthesis method are manganese salts (KMnO<sub>4</sub> and MnSO<sub>4</sub>.H<sub>2</sub>O); water; PEI; and GnP as the substrate. The synthesis is carried out at a temperature of 80°C only and in open air. Highly crystallized Mn<sub>3</sub>O<sub>4</sub> particles, as observed by X-Ray Diffraction (XRD), can be synthesized on GnP surface. It has also been observed that PEI acts as a reducing agent and as a capping agent on a continuous network of ribbon-like Birnessite-MnO<sub>2</sub> (IV) to produce a nearly octahedral shaped nanoparticles of Mn<sub>3</sub>O<sub>4</sub> (II, III). It has already been mentioned that composites of Mn<sub>3</sub>O<sub>4</sub> on graphene or other carbonaceous substrates find a myriad of applications. Thus, our research findings to synthesize GnP-Mn<sub>3</sub>O<sub>4</sub> composite through a simple method should be of interest to a broad group of researchers. In this research, we have investigated the performance of this composite system as a Lithium-ion battery anode only. Our preliminary investigations reveal that the Mn<sub>3</sub>O<sub>4</sub> composite synthesized through this method has just as much potential as the ones prepared through other alternative methods.</p>

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