Relevant bibliographies by topics / Graphene Nano-sheets

Academic literature on the topic 'Graphene Nano-sheets'

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Published: 7 September 2023

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Journal articles on the topic "Graphene Nano-sheets"

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Fauchard, Mélissa, Sébastien Cahen, Philippe Lagrange, Jean-François Marêché, and Claire Hérold. "Gold nano-sheets intercalated between graphene planes." Carbon 65 (December 2013): 236–42. http://dx.doi.org/10.1016/j.carbon.2013.08.019.

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Bansal, Suneev Anil, Amrinder Pal Singh, Anil Kumar, Suresh Kumar, Navin Kumar, and Jatinder Kumar Goswamy. "Improved mechanical performance of bisphenol-A graphene-oxide nano-composites." Journal of Composite Materials 52, no. 16 (November 13, 2017): 2179–88. http://dx.doi.org/10.1177/0021998317741952.

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Epoxy resins have been extensively utilized for mechanical strength applications in the field of aerospace, automobiles, marine, defence, etc. Improving the strength as well as fracture behaviour of the light weight materials is challenging. Present work is an attempt to enhance elastic modulus, hardness and fracture resistance simultaneously by reinforcing the epoxy (bisphenol-A) matrix with a new-age two-dimensional atomically thin graphene oxide filler. Wet chemical oxidation method was used to prepare graphene oxide sheets. Morphological study of the synthesized graphene oxide was carried out using scanning electron microscopy. Fourier-transformed infrared, ultraviolet–visible and Raman spectroscopic techniques were also employed to ascertain the synthesis of graphene oxide. The results confirmed the synthesis of well oxidized graphene oxide sheets. The prepared graphene oxide sheets were then sonicated in acetone solution to ensure better dispersion in the bisphenol-A graphene oxide nano-composite using 0.25, 0.5, 1.0 and 1.5 wt.% graphene oxide reinforcement. Solution mixing method was used to synthesize the polymer nano-composite. Scanning electron microscopy results revealed the smooth dispersion of graphene oxide in the bisphenol-A matrix. Nano-indentation of the bisphenol-A graphene oxide nano-composite showed a considerable jump in elastic modulus at 1 wt.% and hardness at 0.50 wt.% of graphene oxide reinforcement. Fracture resistance of bisphenol-A graphene oxide composite as represented by ratio of elastic modulus to hardness was enhanced by 24% as compared to the pristine bisphenol-A. Our results demonstrate a promising way to improve the mechanical characteristics of epoxy resins through graphene oxide reinforcement at low weight percentages.
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Trusova, Elena A., Dmitrii D. Titov, Asya M. Afzal, and Sergey S. Abramchuk. "Influence of Graphene Sheets on Compaction and Sintering Properties of Nano-Zirconia Ceramics." Materials 15, no. 20 (October 20, 2022): 7342. http://dx.doi.org/10.3390/ma15207342.

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The use of a nanostructured graphene-zirconia composite will allow the development of new materials with improved performance properties and a high functionality. This work covers a stepwise study related to the creation of a nanostructured composite based on ZrO2 and graphene. A composite was prepared using two suspensions: nano-zirconia obtained by sol-gel synthesis and oxygen-free graphene obtained sonochemically. The morphology of oxygen-free graphene sheets, phase composition and the morphology of a zirconia powder, and the morphology of the synthesized composite were studied. The effect of the graphene sheets on the rheological and sintering properties of a nanostructured zirconia-based composite powder has been studied. It has been found that graphene sheets in a hybrid nanostructure make it difficult to press at the elastic deformation stage, and the composite passes into the plastic region at a lower pressure than a single nano-zirconia. A sintering mechanism was proposed for a composite with a graphene content of 0.635 wt%, in which graphene is an important factor affecting the process mechanism. It has been determined that the activation energy of the composite sintering is more than two times higher than for a single nano-zirconia. Apparently, due to the van der Waals interaction, the graphene sheets partially stabilize the zirconia and prevent the disordering of the surface monolayers of its nanocrystals and premelting prior to the sintering. This leads to an increase in the activation energy of the composite sintering, and its sintering occurs, according to a mixed mechanism, in which the grain boundary diffusion predominates, in contrast to the single nano-zirconia sintering, which occurs through a viscous flow.
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Afzal, A. M., E. A. Trusova, and A. A. Konovalov. "Obtaining hybrid nanostructures based on graphene and nano-ZrO2." Perspektivnye Materialy 10 (2022): 52–63. http://dx.doi.org/10.30791/1028-978x-2022-10-52-63.

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A technologically promising method for obtaining nanostructured graphene/ZrO2 has been proposed. Its main idea is to use suspensions of graphene and nano-ZrO2 and create conditions for the interaction of graphene sheets and ZrO2 crystallites to form a hybrid nanostructured powder without the formation of new chemical bonds. The oxygen-free graphene sheets with thickness of several nanometers were obtained by sonochemical method in N,N-dimethyloctylamine-aqua emulsion. Nano-ZrO2 powder with average crystallite size of 8.1 nm was synthesized by sol-gel method. The morphology and phase composition of all synthesized objects (nano-ZrO2, graphene, composite) were studied by using a set of instrumental methods (transmission electron microscopy (TEM) and electron diffraction, x-ray diffraction (XRD), electron energy loss spectroscopy (EELS), nitrogen adsorption-desorption, diffusion aerosol spectrometry (DAS) and elemental analysis). It was shown that the proposed method allows obtain chemically homogeneous mesoporous hybrid powders consisting of graphene sheets and ZrO2 crystallites with a size of 8 – 13 nm fixed on them. We investigated an effect of duration of ultrasonic impact to graphite on the morphology of the hybrid and the mechanism of its formation. According to the results of a comprehensive analysis of the obtained data, the mechanisms for the formation of graphene suspension in emulsion and a nanostructured hybrid during the interaction of crystalline ZrO2 and oxygen-free graphene sheets in an aqueous-organic medium was proposed. The developed hybrid nanostructures are highly demanded innovative raw-products in the production of (photo)catalysts for a wide range of processes, sensor, ceramic and electrical materials, and materials for medical and biological purposes.
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Yengejeh, Sadegh Imani, Seyedeh Alieh Kazemi, Oleksandr Ivasenko, and Andreas Öchsner. "Simulations of Graphene Sheets Based on the Finite Element Method and Density Functional Theory: Comparison of the Geometry Modeling under the Influence of Defects." Journal of Nano Research 47 (May 2017): 128–35. http://dx.doi.org/10.4028/www.scientific.net/jnanor.47.128.

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In the present research, imperfect graphene sheets were generated and their vibrational property was studied via finite element analysis. The effect of vacant sites in the arrangement of these nano-structures was examined. The fundamental frequency of the defect free and imperfect nano-sheets was acquired based on two different approaches. The first approach was a pure finite element simulation. The second approach for comparison purpose was a recently reported refined finite element simulation at which the vicinity of a defect was first evaluated according to the density functional theory (DFT) and then the refined geometry was implemented into a finite element model. The findings of this research show that the fundamental frequency of graphene sheets decreases by presenting microscopic imperfection to the formation of these nano-materials. In addition, it was pointed out that the geometry based on the more precise DFT simulations gives a higher decrease in the fundamental frequency of the sheets for all considered cases.
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Siburian, R., H. Sihotang, S. Lumban Raja, M. Supeno, and C. Simanjuntak. "New Route to Synthesize of Graphene Nano Sheets." Oriental Journal of Chemistry 34, no. 1 (February 25, 2018): 182–87. http://dx.doi.org/10.13005/ojc/340120.

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Siburian, Rikson, Dewiratih Dewiratih, Andiayani Andiayani, Sabarmin Perangin-Angin, Helmina Sembiring, Herlince Sihotang, Saur Lumban Raja, et al. "Facile Method to Synthesize N-Graphene Nano Sheets." Oriental Journal of Chemistry 34, no. 4 (August 25, 2018): 1978–83. http://dx.doi.org/10.13005/ojc/3404035.

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Al-Tamimi, B. H., S. B. H. Farid, and F. A. Chyad. "Modified Unzipping Technique to Prepare Graphene Nano-Sheets." Journal of Physics: Conference Series 1003 (May 2018): 012020. http://dx.doi.org/10.1088/1742-6596/1003/1/012020.

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Dey, Abhijit, Vinit Nangare, Priyesh V. More, Md Abdul Shafeeuulla Khan, Pawan K. Khanna, Arun Kanti Sikder, and Santanu Chattopadhyay. "A graphene titanium dioxide nanocomposite (GTNC): one pot green synthesis and its application in a solid rocket propellant." RSC Advances 5, no. 78 (2015): 63777–85. http://dx.doi.org/10.1039/c5ra09295g.

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A green process was developed for a graphene–titanium dioxide nanocomposite (GTNC) synthesis by dispersing titanium dioxide (TiO2) nanoparticles and graphene nano-sheets (GNSs) in ethanolviaultrasonication followed by microwave irradiation.
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Rivera, Jose L., Francisco Villanueva-Mejia, Pedro Navarro-Santos, and Francis W. Starr. "Desalination by dragging water using a low-energy nano-mechanical device of porous graphene." RSC Advances 7, no. 85 (2017): 53729–39. http://dx.doi.org/10.1039/c7ra09847b.

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Dissertations / Theses on the topic "Graphene Nano-sheets"

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Wang, S. Q. "Car-Parrinello Molecular Dynamics of Nanosized Graphene Sheets." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35242.

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Car-Parronello molecular dynamics simulations of twelve nanosized graphene sheets with a dozen to a hundred carbon atoms are performed using a mixed Gaussian and planewave approach within the frame-work of the density-functional theory. Two different origins for the rippled structure of graphene are found: the thermodynamic vibration of atoms and the local lattice defect. We suggest that the lattice defect, which changes the local atomic bonding state, should be responsible for the intrinsic ripples in graphene sheet. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35242
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Holliday, Nathan. "Processing and Properties of SBR-PU Bilayer and Blend Composite Films Reinforced with Multilayered Nano-Graphene Sheets." University of Cincinnati / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1458300045.

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Chi-HuaHsu and 徐啟華. "Characterization and Optimal Design of Graphene Sheets on Micro/Nano Actuators." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/70913433104122613605.

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碩士
國立成功大學
機械工程學系
103
With the rapid growth of semiconductor process technologies, micro / nano-electromechanical systems is well developed. Nowadays, the conventional semiconductor device can’t meet the requirements because of its weight, bulk and high power consumption. The application of micro / nano electromechanical technology to achieve functional integration, bandwidth, low signal loss and small size requirements is used to solve this problem. Graphene have excellent chemical and machinery stability and it’s suitable for the application of micro / nano components in high speed, high sensitivity and high current density. This paper shows systematic analysis and design methods for actuator electrodes of electrostatic driving micro actuator, and further discuss about the graphene sheet as the basic element. Meshfree method with no grid dependence, it is only necessary to know the information of node location. It is easy to analyze the data. Thus, we adopted EFGM as our methods. Finally apply an electrostatic force and nonlocal elastically theory to observe the changes in the structure of the graphene. Simulation results show that: through the nonlocal parameters and electrostatic driving will cause reduction of frequency in the structure. By the EFGM analysis, it can be observed that method provides not only the value of voltage rapidly which arise adsorption phenomena but also reduces the cost of experiments. The value could be as a reference to company.
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Srinivasanaik, Azmeera. "AFM and STM Characterization of Electrochemically Synthesized Few-Layer Graphene Nano-Sheets." Thesis, 2018. http://ethesis.nitrkl.ac.in/9579/1/2018_MT_216MM1425_ASrinivasanaik_AFM.pdf.

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The aim of this work is electrochemical exfoliation of pyrolytic graphite for mass production of few-layer graphene nano sheets. It is synthesized by intercalation of graphite sheets in the electrolyte of two different types of concentrations, one molar and two molar concentrations of nitric acid by application of positive bias. The voltage is gradually increased with an increment of 0.5V upto 8V and an interval of 3 minutes. The X-ray diffraction peaks corresponding to graphene sheet ((002) plane) were observed at 2θ positions of 26.35°. The morphology of as-synthesized FLGNSs is characterized by field emission scanning electron microscopy. The transparent layers of FLGNSs are observed in transmission electron microscopy. The number of layers in transparent graphene sheets is confirmed by the HRTEM. Through FTIR studies, the presence of functional groups of O-H and C-O has been identified. AFM topography revealed that the thickness of the single layer is in the range of 1 nm, and for few-layer graphene nano sheets are in the range of 5-6 nm only. However, FLGNSs could be readily distinguished through phase imaging of tapping-mode AFM, because of differences in hydrophobicity arising from their different oxygen contents. STM studies of graphene nanosheets revealed atomic scaled periodicity at very low tunneling currents (∼1 pA). Phase imaging showed distinct contrast difference between FLGNSs to the graphite substrate (HOPG), a result that was attributed to their extremely low conductivity. The atomically flatness of the graphene nano sheets and electronic properties were measured by scanning tunneling microscopy. Scanning probe spectroscopy revealed the electronic properties like the density of states (DOS) and Dirac point (DP) of graphene sheets. The synthesized material can be used as a base material for the future applications such as desalination of sea water, supercapacitors, sensors, solar cells, and coatings.
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Liu, Cheng-Hao, and 劉承浩. "Synthesis and Optoelectronic Properties of Poly(fluorene-alt-thiophene) Comprising Nano Graphene Sheets." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/36731003518401988063.

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碩士
國立中正大學
化學工程所
97
Graphite was acidified to convert to graphite oxide via the Hummers method, and the resulting exfoliated graphite oxide sheets were reduced by phenylhydrazine in the presence of conjugated polymer PDOFT to form the PDOFT/GS polymeric nanocomposite. This novel polymeric nanocomposite was characterized by FT-IR spectroscopy, X-ray photoelectron spectroscopy, atomic force microscope, scanning electron microscopy, transmission electron microscope, UV/Vis spectroscopy, photoluminescence spectroscopy and various optoelectronic instruments. TGA and DSC analyses indicate that all polymeric nanocomposites are thermally stable up to 400℃ without detectable melting points. By introducing graphene sheets into the polymer matrix, the threshold voltage of the PLED device is lowered and both of the current efficiency and the carrier mobility were improved.
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Chiou, Po-Jiun, and 邱柏鈞. "Synthesis and Optoelectronic Properties of Poly fluorene-block-polythiophene Comprising Nano Graphene Sheets." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/02517459316046375324.

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碩士
國立中正大學
化學工程所
98
Graphite was acidified to convert to graphite oxide via the Hummers method, and the resulting exfoliated graphite oxide sheets were reduced by octadecylamine in the presence of conjugated polymer PF-b-P3HT to form the PF-b-P3HT/Gr polymeric nanocomposite. This novel polymeric nanocomposite was characterized by FT-IR spectroscopy, X-ray photoelectron spectroscopy, atomic force microscope, scanning electron microscopy, transmission electron microscope, UV/Vis spectroscopy, photoluminescence spectroscopy and various optoelectronic instruments. TGA and DSC analyses indicated that all polymeric nanocomposites were thermally stable up to 400℃ with the glass transition temperature being to 150℃. And the melting point being 230℃.By introducing graphene sheets into the polymer matrix, the threshold voltage of the PLED device was lowered and both of the current efficiency and the carrier mobility were improved.
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Yang, Chih-Yu, and 楊芷瑀. "Preparation and Characterization of Graphene Nano Sheets/Waterborne Polyurethane Nanocomposite for Electromagnetic Interference Shielding." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/459r4t.

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碩士
國立清華大學
化學工程學系
103
The aim of this study is to prepare the electromagnetic interference shielding (EMI SE) polymer composite by two-dimentional Graphene Nano Sheets (GNS) and Waterborne Polyurethane (WPU) via solution mixing method. This study includes two parts. In the first part, graphene oxide (GO) was prepared from graphite by modified Hummers’ method, and then was reduced to GNS by NaBH4. In order to improve the dispersion and to prevent the restacking and aggregations of GNS during reduction, [2-(Methacryloyloxy)-ethyl]- trimethyl ammonium chloride (AETAC) was grafted onto the GO and GNS surface by free radical polymerization to form FGO and FGNS. FGO was reduced to FRGO by chemical reduction with NaBH4. According to the results of analysis of XRD, XPS and TEM, it was confirmed that AETAC was grafted onto GO and GNS surface. A simple solution mixing method was used to prepare GNS/WPU, FGNS/WPU and FRGO/WPU composite with 1, 3, 5 and 10 wt% filler content. The electrical conductivity of GNS/WPU (FGNS/WPU and FRGO/WPU) composites was increased with the filler content. The results showed that the highest electrical conductivity of 2.07 S/cm and EMI shielding effectiveness (EMI SE) of approximately 17 dB in the frequency of 8.2–12.4 GHz (X-band) were obtained by the 10 wt% filler content of FRGO/WPU composite. In the second part, in order to increase the electrical conductivity and EMI SE of composites, silver nanoparticles (Ag NPs) were deposited on the FRGO surfaces to form Ag@FRGO. The different weight ratios of Ag NPs to FRGO were 1：1, 1：3, 1：5 and 1：10, which formed 1Ag@FRGO, 3Ag@FRGO, 5Ag@FRGO and 10Ag@FRGO. A simple solution mixing method was used to prepare Ag@FRGO/WPU composites with 10 wt% filler content and different weight ratios of Ag NPs to FRGO. Results showed that the electrical conductivity and EMI SE of Ag@FRGO/WPU composites were increased with the increasing weight ratio of Ag NPs to FRGO. The highest electrical conductivity and EMI SE of 10Ag@FRGO/WPU composite over the frequency of 8.2–12.4 GHz were improved to 25.5 S/cm and 35 dB, respectively.
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Arash, Behrouz. "Molecular dynamics studies on application of carbon nanotubes and graphene sheets as nano-resonator sensors." 2013. http://hdl.handle.net/1993/22278.

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The main objective of the research is to study the potential application of carbon nanotubes and graphene sheets as nano-resonator sensors in the detection of atoms/molecules with vibration and wave propagation analyses. It is also aimed to develop and examine new methods in the design of nano-resonator sensors for differentiating distinct gas atoms and different macromolecules, such as DNA molecules. The hypothesis in the detection techniques is that atoms or molecules attached on the surface of the nano-resonator sensors would induce a recognizable shift in the resonant frequency of or wave velocity in the sensors. With this regard, a sensitivity index based on the shift in resonant frequency of the sensors in the vibration analysis and/or a shift in wave velocity in the sensors in the wave propagation analysis is defined and examined. In order to achieve the objective, the vibration characteristics of carbon nanotubes and graphenes are studied using molecular dynamics simulations to first propose nano-resonator sensors, which are able to differentiate distinct gas atoms with high enough resolutions even at low concentration. It is also indicated that the nano-resonator sensors are effective devices to identify different genes even with the same number of nucleobases in the structure of single-strand DNA macromolecules. The effect of various parameters such as size and restrained boundary conditions of the sensors, the position of attached atoms/molecules being detected, and environment temperature on the sensitivity of the sensors is investigated in detail. Following the studies on vibration-based sensors, the wave propagation analysis in carbon nanotubes and graphene sheets is first investigated by using molecular dynamics simulations to design nano-resonator sensors. Moreover, a nonlocal finite element model is presented and calibrated for the first time to model propagation of mechanical waves in graphene sensors attached with atoms through a verification process with atomistic results. The simulation results reveal that the nano-resonator sensors are able to successfully detect distinct types of noble gases with the same mass density or at the same environmental condition of temperature and pressure.
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黃郁芩. "Preparation and Characterization of Graphene Nano sheets/Waterborne Polyurethane Nanocomposites for Electromagnetic Interference Shielding via Self-Assembly Process." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/we5y8s.

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Fan, Yang-chun, and 范揚均. "Morphology, electrical conductivity, crystalline property of high density polyethylene/polyamide/graphene nano sheets composites prepared by melt-compounding." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/06366971148305821535.

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碩士
逢甲大學
纖維與複合材料學系
104
This study focused on the morphology change of immiscible polymer, high-density polyethylene(HDPE) and polyamide 6(PA blends with the incorporation of GNSs to produce double double percolation, to find the direct relationship between the GNS content with compatibilizer introduce of blends and the network structure of GNSs. The conductivities of HDPE/PA6 composites filled with different amounts of GNS were measured by 4-point Probe and Source meter. The morphologies, GNS dispersion and crystallization behavior of HDPE/PA6/GNS composites were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and differential scanning calorimetry (DSC). Analysis the ratio 50/50 HDPE/PA6 will produce co-continuous morphology by SEM and TEM, different content GNSs bring about morphology change. The GNSs located in HDPE/PA6 phases form conductive network, we find the double percolation bring in 3wt% and 5wt% of HDPE/PA6-6N/GNS and HDPE/PA6-10k/GNS, Incorporate the HDPE-g-MA will more improve the conductivity of HDPE/HDPE-g-MA/PA6-6N/GNS-M in 5wt%.
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Book chapters on the topic "Graphene Nano-sheets"

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Jungen, Alain. "Nano-spectroscopy of Individual Carbon Nanotubes and Isolated Graphene Sheets." In Confocal Raman Microscopy, 157–76. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-75380-5_7.

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Jungen, Alain. "Nano-spectroscopy of Individual Carbon Nanotubes and Isolated Graphene Sheets." In Confocal Raman Microscopy, 91–109. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-12522-5_5.

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Naseem, Z., K. Sagoe-Crentsil, and W. Duan. "Graphene-Induced Nano- and Microscale Modification of Polymer Structures in Cement Composite Systems." In Lecture Notes in Civil Engineering, 527–33. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-3330-3_56.

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AbstractRedispersible polymers such as ethylene–vinyl acetate copolymer (EVA) have attracted attention in construction due to their enhanced flexural strength, adhesion, flexibility and resistance against water penetration. However, EVA particles cluster in a highly alkaline cementitious matrix and exhibit poor interaction with the cement matrix. The underlying mechanism of poor dispersibility of EVA is attributed to hydrophobic groups of polymers, a variation in the adsorption rate and molecular diffusion to the interface where they cluster together. This phenomenon can negatively affect the fresh properties of cement and produce a weak microstructure, adversely affecting the resulting composites’ performance. This study highlights how graphene oxide (GO) nanomaterial alters the nano- and microscale structural characteristics of EVA to minimize the negative effects. Transmission electron microscopy (TEM) revealed that the GO sheets modify EVA’s clustered nanostructure and disperse it through electrostatic and steric interactions. Furthermore, scanning electron microscopy (SEM) confirmed altered microscale structural characteristics (viz. surface features) by GO. The altered and enhanced material scale engineering performance, such as the compressive strength of the resulting cement composite, was notable.
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Das, Barsha, Sagnik Das, Soumyabrata Tewary, Sujoy Bose, Sandip Ghosh, and Avijit Ghosh. "Graphene Nano Sheets for the Fuel Cell Applications." In Advances in Nanosheets [Working Title]. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.1001838.

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The Chapter will be consist of following topic: 1) Introduction of Graphene Nanosheets: The important of nanosheets and their properties will be discussed for the various electrochemical activities. 2) Role of Graphene nanosheets as PEM fuel cell Electrocatalyst: Graphene as a electrocatalyst for PEM fuel cell will be discussed and compared with the recent trends. 3) Application of Graphene nanosheets on PEM Fuel Cell: The application in different components in PEM fuel cell will be discussed. 4) Role of graphene Nanosheets on ORR and HAD activity: The properties will be discussed on the effect of nanosheets. 5) PEM Fuel Cell Performance: Over all performance improvement will be discussed
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Kondo, Hiroki, Masaru Hori, and Mineo Hiramatsu. "Nucleation and Vertical Growth of Nano-Graphene Sheets." In Graphene - Synthesis, Characterization, Properties and Applications. InTech, 2011. http://dx.doi.org/10.5772/23703.

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Ikram, Muhammad, Ali Raza, Atif Shahbaz, Haleema Ijaz, Sarfraz Ali, Ali Haider, Muhammad Tayyab Hussain, Junaid Haider, Arslan Ahmed Rafi, and Salamat Ali. "Carbon Nanotubes." In Sol Gel and other Fabrication Methods of Advanced Carbon Materials [Working Title]. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.95442.

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Carbon nanotubes (CNTs) are referred to as carbon nano-architecture allotropes, with wrapped graphene sheets forming a cylindrical structure. CNTs are either developed by metals or narrow-band semiconductors with rolling graphene sheets in various ways. Researchers have dedicated a great deal of attention to understanding the fascinating properties of CNTs over the years, and possess certain peculiar properties, such as a high degree of stiffness, a wide ratio of length to diameter, and remarkable toughness, and are employed in a number of applications. These properties can be enhanced by scheming the diameter, nature of walls, chirality, length of CNTs which is rolled up, and depending on the synthesis process. This chapter extensively covers the various properties of CNTs and how it influences to desired applications and also explains numerous methods of synthesis and processing of CNTs with advantages and some drawbacks.
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"Self Assembly and Building Nano Structures." In Polymer Structure Characterization: From Nano to Macro Organization in Small Molecules and Polymers, 393–424. 2nd ed. The Royal Society of Chemistry, 2013. http://dx.doi.org/10.1039/bk9781849734332-00393.

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Self assembly has been a developing theme through this monograph. Some structures, by the nature of the processes used in their synthesis form molecules which naturally self assemble. Carbon-based spheres and nano tubes have interesting and important characteristics. Sheets of carbon, graphene, exhibits electrical conductivity and physical property characteristics which make these materials potentially very important technologically. So-called intrinsic conducting polymers have been developed form polyacetylene and are utilized in display applications. Reinforcement of polymer systems can also be achieved by the use of exfoliated clay systems, in which the nano scale of the clay platelets allows order to be created within the polymer matrix. Combining inorganic and organic elements it is possible to create structures with large voids for permeation applications and to influence the growth or inorganic crystals by habit control.
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Vijay, Manish Kumar, and Radheshyam Sharma. "Carbon Nano Tubes (CNTs) as a Tool of Seed Quality Enhancement Using Nanopriming Approach." In Nanopriming Approach to Sustainable Agriculture, 90–109. IGI Global, 2023. http://dx.doi.org/10.4018/978-1-6684-7232-3.ch004.

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Nano seed technology is a new platform with endless possibilities and impacts on applied agriculture and forestry research. The implementation of nanotechnology in seed research is in its infancy and needs more pace to meet the needs of current global demand. Carbon nanotubes (CNTs) are allotropes of carbon and engineered nanomaterials. Based on the number of concentric layers of rolled graphene sheets, they are classified into single-walled CNTs (SWCNTs) and multi-walled CNTs (MWCNTs). CNTs exhibit both beneficial and toxic effects on plant species by altering the morphological and physiological properties of plant cells. In most of the studies, low concentrations of CNTs are considered safe. Therefore, there is plenty of room to use these cutting-edge technologies to alleviate seed dormancy, boost vigor, and solves the problem of slow growth in seed propagated species. This chapter summarizes the results of various studies investigating the effects of carbon nanotubes on seed viability, as well as seedling growth and biomass.
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Muñoz, Roberto, Mar García-Hernández, and Cristina Gómez-Aleixandre. "CVD of Carbon Nanomaterials: From Graphene Sheets to Graphene Quantum Dots." In Handbook of Carbon Nano Materials, 127–83. WORLD SCIENTIFIC, 2015. http://dx.doi.org/10.1142/9789814678919_0004.

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Balachandran, Manoj. "Extraction of Preformed Mixed Phase Graphene Sheets from Graphitized Coal by Fungal Leaching." In Handbook of Research on Inventive Bioremediation Techniques, 287–99. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-2325-3.ch012.

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The potential use of coal as source of carbon nano structure is seldom investigated. Herein we report a facile fungal solubilization method to extract mixed phase carbon structure from low grade coal. Coal had been used as a primary source for the production of carbon nanostructure with novel property, in addition to its main utility as a fuel. The major hurdle in its application is the inherent mineral embedded in it. An environmentally benign demineralization procedure make coal as a widely accepted precursor for the novel carbon materials. With Aspergiilus niger leaching, the randomly oriented preformed crystalline mixed phase nanocarbon in coal can be extracted. Raman studies revealed the presence of E2g scattering mode of graphite. The sp3 domains at ~1355 cm-1 (D band) is an indication of diamond like structure with disorder or defect. In the 2D region, multilayer stacking of graphene layers is noticed. The ratio of the defect to graphitic bands was found to be decreasing with increasing rank of coal. Bio leaching of coal enhances the carbon content in coal while eliminating the associated minerals in it. These defected carbon is an ideal material for graphene quantum dots and carbon dots, which are useful in drug delivery and bio imaging applications.
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Conference papers on the topic "Graphene Nano-sheets"

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Siburian, Rikson, and Oktavian Silitonga. "Performance of primary battery prototype: Cu/graphene nano sheets//electrolyte//C-π (graphite, graphene nano sheets, n–graphene nano sheets)." In THE 9TH INTERNATIONAL CONFERENCE OF THE INDONESIAN CHEMICAL SOCIETY ICICS 2021: Toward a Meaningful Society. AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0104014.

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Ye, J., Y. Zhang, M. Yoshida, Y. Saito, and Y. Iwasa. "Transistors on Nano-sheets Beyond Graphene." In 2013 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2013. http://dx.doi.org/10.7567/ssdm.2013.c-6-1.

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Sihotang, Herlince, Rikson Siburian, Crystina Simanjuntak, Saur Lumban Raja, Minto Supeno, Vivi Sukmawati, and Zul Alfian. "Formation Process of Graphene Nano Sheets." In International Conference on Chemical Science and Technology Innovation. SCITEPRESS - Science and Technology Publications, 2019. http://dx.doi.org/10.5220/0008839400360038.

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Chen, Zhen, Wanyoung Jang, Wenzhong Bao, Chun Ning Lau, and Chris Dames. "Heat Transfer in Encased Graphene." In ASME 2009 Heat Transfer Summer Conference collocated with the InterPACK09 and 3rd Energy Sustainability Conferences. ASMEDC, 2009. http://dx.doi.org/10.1115/ht2009-88370.

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Experimentally understanding the heat transfer in graphene (sheets of graphite a few atoms thick) is important for fundamental physics as well as device applications. In particular, measurements of the heat flow through graphene encased by oxide layers are essential for future graphene-based nanoelectronics, interconnects, and thermal management structures. Here we use a “heat spreader method” to study the heat dissipation performance of encased graphene. Measurements show enhanced heat spreading by a graphene layer as compared to control samples without graphene. At room temperature, the in-plane thermal conductivity of encased graphene sheets of thickness 2 nm and 5 nm is measured to be ∼150 W/m-K, more than one order of magnitude smaller than a published report for a freely-suspended graphene sheet [A. A. Balandin et al., Nano Lett. 8, 902], as well as bulk graphite. We also used a differential 3ω method to measure the thermal contact resistance between graphene and SiO2, finding a value around 10−8 m2-K/W at room temperature. Possible reasons for the unexpectedly low thermal conductivity are also discussed.
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Wang, Huabin, Jonathan J. Wilksch, Richard A. Strugnell, and Haijun Yang. "Interrogate the antibacterial activities of nano graphene oxide sheets." In 2016 IEEE International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3M-NANO). IEEE, 2016. http://dx.doi.org/10.1109/3m-nano.2016.7824976.

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Illera, Danny, Chatura Wickramaratne, Diego Guillen, Chand Jotshi, Humberto Gomez, and D. Yogi Goswami. "Stabilization of Graphene Dispersions by Cellulose Nanocrystals Colloids." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-87830.

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The outstanding properties of single-layer graphene sheets for energy storage are hindered as agglomeration or restacking leads to the formation of graphite. The implications of the aforementioned arise on the difficulties associated with the aqueous processing of graphene sheets: from large-scale production to its utilization in solvent-assisted techniques like spin coating or layer-by-layer deposition. To overcome this, aqueous dispersions of graphene were stabilized by cellulose nanocrystals colloids. Aqueous cellulose nanocrystals dispersion highlights as a low-cost and environmentally friendly stabilizer towards graphene large-scale processing. Colloids of cellulose nanocrystals are formed by electrostatic repulsion of fibrils due to de-protonated carboxyl or sulfate half-ester functional groups. Graphene dispersions are obtained by hydrothermal reduction of electrochemically exfoliated graphene oxide in the presence of cellulose nanocrystals. This approach allows the preservation of the intrinsic properties of the nano-sheets by promoting non-covalent interactions between cellulose and graphene. The dispersions could be cast to form free-standing flexible conducting films or freeze-dried to form foams and aerogels for capacitive energy storage.
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Pasaribu, Elsa, Rikson Siburian, Minto Supeno, and Mita Manalu. "Performance of primary battery prototype: Nickel/graphene nano sheets (GNS)//electrolyte//graphite and GNS." In THE II INTERNATIONAL SCIENTIFIC CONFERENCE “INDUSTRIAL AND CIVIL CONSTRUCTION 2022”. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0136012.

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Arsat, R., M. Breedon, M. Shafiei, K. Kalantar-zadeh, W. Wlodarski, S. Gilje, R. B. Kaner, and F. J. Arregui. "Graphene-like nano-Sheets/36° LiTaO3 surface acoustic wave hydrogen gas sensor." In 2008 IEEE Sensors. IEEE, 2008. http://dx.doi.org/10.1109/icsens.2008.4716414.

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Siburian, Rikson, Herlince Sihotang, Saur Lumban Raja, Minto Supeno, Crystina Simanjuntak, and Hana Manurung. "Nanometers Formation Model of Iron (Fe) and Magnesium (Mg) on Graphene Nano Sheets." In International Conference on Chemical Science and Technology Innovation. SCITEPRESS - Science and Technology Publications, 2019. http://dx.doi.org/10.5220/0008838600260029.

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Sadri, Mehran, Davood Younesian, and Ebrahim Esmailzadeh. "Application of Variational Iteration Method in Nonlinear Free Vibration Analysis of Multi-Layered Nano-Scale Graphene Sheets." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-38957.

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The nonlinear free vibration of multi-layered nano-scale graphene sheets is studied. Using the von Kármán and nonlocal continuum theories, large amplitude of vibration is included in the analysis as well as the size effect of nano-structure. The SSSS boundary condition is considered for the multi-layered graphene sheet and coupled nonlinear differential equations of motion of layers are taken into account based on Galerkin method. Variational iteration method (VIM) is employed as the solution procedure and nonlinear natural frequencies of the system are analytically determined. Two different geometries are taken into account and the analytical results are compared with frequencies obtained by numerical method. Finally, influence of geometrical parameters and amplitude of vibration on nonlinear frequencies of the system is examined.
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