From nano to mesoscale via density functional theorybased tightbinding objective molecular modeling hao xu et alelectron doping effects on the electrical conductivity of zigzag carbon nanotubes and corresponding unzipped armchair graphene nanoribbons hamze mousavi et al. Unzipping carbon nanotubes to nanoribbons for revealing the. Here we present a study of gnrs with controlled unzipping level and the prevailing factors. In this work, we analyze the energetics of oxidation and hydrogenationinduced unzipping processes. The allsemiconducting nature of sub10nm gnrs could bypass the problem of the. Jul 21, 2009 the fabrication of graphene nanoribbons from carbon nanotubes cnts treated with potassium permanganate in a concentrated sulfuric acid solution has been reported by kosynkin et al. Graphene is the basic structural element of some carbon allotropes including graphite charcoal carbon nanotubes fullerence chemical structures.
Pdf aligned graphene nanoribbons and crossbars from. Aberrationcorrected transmission electron microscopy tem revealed a high percentage of twolayer 2 l gnrs and some singlelayer ribbons. Graphene nanoribbons split from nanotubes in a process. Unzipping cnts with welldefined structures in an array will. Origin and control of polyacrylonitrile alignments on. Electrochemical unzipping of multiwalled carbon nanotubes for. The layer layerstackinganglesrangedfrom0 to30 including. Mechanism of carbon nanotubes unzipping into graphene ribbons. The oxidation of cnxmwcnts was carried out using potassium permanganate in the presence of trifluoroacetic acid or phosphoric acid. The carbon carbon bond length in graphene is about 0. Fluorinated graphene nanoribbons from unzipped single.
Graphene nanoribbons gnrs, as manufactured by unzipping the cnts, have. Graphene nanoribbons from unzipped carbon nanotubes arxiv. Several lithographic7,8, chemical911 and synthetic12 procedures are known to produce microscopic samples of graphene nanoribbons, and one chemical. Narrow graphene nanoribbons from carbon nanotubes nature. Characterization of graphene nanoribbons from the unzipping of. Fluorinated graphene nanoribbons from unzipped singlewalled. The allsemiconducting nature of sub10nm gnrs could bypass the problem of the extreme chirality dependence of the metal or semiconductor nature of carbon. Graphitic multiwalled carbon nanotubes mwcnts are controllably unzipped into edgerich graphene nanoribbons to reveal the roles of edges and defects in persulfate activation for bisphenol a. Graphene nanoribbons gnrs are materials with properties distinct from those of other carbon allotropes15. An easy and scalable approach is reported for the production of multilayer graphene nanoribbons gnrs from thermally treated unzipped multiwalled carbon nanotubes mwcnts by controlled. Graphene nanoribbons have been prepared using different methods, including the unzipping of carbon nanotubes jiao et al. Raman spectroscopy and electrical transport measurements reveal the high quality of the gnrs.
Jul 14, 2011 graphene nanoribbons gnrs with smooth edges and controllable widths are crucial for graphene electronic and spintronic applications. Several lithographic7,8, chemical911 and synthetic12 can be explained by concerted attachment to neighbouring carbon procedures are known to produce microscopic samples of graphene atoms by permanganate, contrasting with the random attack on non nanoribbons, and one chemical vapour deposition process has neighbouring carbon atoms by the. Mar 01, 2020 graphene nanoribbons gnr have shown great promise for applications in electronics, sensors, energyconversionstorage devices, conductive composite materials, and biological fields. Preparation of graphene nanoribbons gnrs as an electronic. Jan 21, 2021 monolayer fluorinated graphene nanoribbons fgnrs were fabricated by unzipping singlewalled carbon nanotubes swcnts using pure f 2 gas at high temperature, which delivered an unprecedented energy density of 2738. Apr 16, 2009 graphene nanoribbons gnrs are materials with properties distinct from those of other carbon allotropes 1,2,3,4,5. Thermal conductivity and thermal rectification in unzipped. Atomic force microscope afm imaging and raman mapping on the same cnts before and after. Electronic thermal conductivity of armchair graphene.
Onestep oxidation preparation of unfolded and good soluble. Disclosed is a method for making graphene nanoribbons gnrs by controlled unzipping of structures such as carbon nanotubes cnts by etching e. We report on the transport properties of novel carbon nanostructures made of partially unzipped carbon nanotubes, which can be regarded as a seamless junction of a tube and a nanoribbon. Enriched carbon edges remarkably enhance the catalytic performance and can serve as hosting sites for heteroatom n, s doping to promote carbocatalysis. Comparing atomic resolution images of scanning tunneling microscopy with the lattice of graphene, the edge structures of nanoribbons are identified. Graphene nanoribbons derived from the unzipping of carbon. Helical and dendritic unzipping of carbon nanotubes. Jan 01, 2017 through the greens function formalism and tightbinding hamiltonian model calculations, the temperature dependent electronic thermal conductivity tc for different diameters of zigzag carbon nanotubes and their corresponding unzipped armchair graphene nanoribbons is calculated. The partial unzipping of the carbon nanotubes yields a mixture of carbon nanotubes and nanoribbons. The reduced graphene oxide nanoribbons rgonrs show ultrastrong em absorption, which is promising in the application of radar wave absorption and electromagnetic shielding.
Unzipping of multiwalled carbon nanotubes mwcnts is a promising strategy for scalable preparation of graphene nanoribbons gnrs. Fieldeffect transistors based on single graphene oxide. Atomic structures, raman spectroscopy, and electrical properties june 2011 journal of the american chemical society 327. Us8236626b2 narrow graphene nanoribbons from carbon. Oxidative unzipping of multiwall carbon nanotubes to graphene. The youngs modulus, shear modulus and poissons ratio of graphene nanoribbons are different with varying sizes with different length and width and shapes. Topdown synthesis of graphene nanoribbons using different.
Jan 25, 2018 origin and control of polyacrylonitrile alignments on carbon nanotubes and graphene nanoribbons juho lee graduate school of energy, environment, water, and sustainability, korea advanced institute of science and technology, daejeon, 305. Facile synthesis of highquality graphene nanoribbons. The diameter and chirality of cnts control the geometry of the unzipped nanoribbons. Nanotube unzipping was achieved by a polymerprotected ar plasma etching method, and the resulting nanoribbon array can be transferred onto any chosen substrate. Bamboo structured nitrogendoped multiwalled carbon nanotubes cnxmwcnts have been successfully unzipped by a chemical oxidation route, resulting in nitrogendoped graphene nanoribbons cnxgnrs with a multifaceted microstructure. Rangel graphene nanoribbons gnr are promising materials for a wide range of applications, but their practical implementation requires edge and width controllability, low fabrication costs, and approachable large scale production.
Narrow graphene nanoribbons from carbon nanotubes hongjie dai. It is found that the thermal conductivity of a graphene nanoribbon is much less than that of its perfect carbon nanotube counterparts because of the. Atomic structures, raman spectroscopy, and electrical properties liming xie, hailiang wang, chuanhong jin, xinran wang, liying jiao, kazu suenaga, and hongjie dai, department of chemistry, stanford university, california 94305, united states. We find that graphene nanoribbons act at certain energy ranges as perfect valley filters for carbon nanotubes, with the maximum possible conductance. We investigated the atomic structures, raman spectroscopic and electrical transport properties of individual graphene nanoribbons gnrs. These mechanical properties are anisotropic and would. Jan 21, 2021 herein, monolayer fluorinated graphene nanoribbons fgnrs were fabricated by unzipping singlewalled carbon nanotubes swcnts using pure f2 gas at high temperature, which delivered an unprecedented energy density of 2738. Longitudinal unzipping of carbon nanotubes to form graphene nanoribbons. Commercialized gnr are mostly produced by unzipping highquality carbon nanotubes cnt, predominantly mitsui cnt.
Graphene nanoribbon aerogels unzipped from carbon nanotube. Aberrationcorrected transmission electron microscopy tem revealed a high percentage of twolayer 2 l. A facile and scalable approach to develop electrochemical. Graphene nanoribbons gnrs from chemical unzipping of carbon nanotubes cnts have been reported to be a suitable. Xiaolin hu et al 2018 nanotechnology 29 145705 view the article online for updates and enhancements. Sep 15, 2019 here, we propose to unzip carbon nanotubes into graphene oxide nanoribbons gonrs, followed by controllable reduction treatment. Graphene ribbon devices from unzipped carbon nanotubes norma l. Since the twodimensional graphene sheet with strong bonding is known to be one of the stiffest materials, graphene nanoribbons youngs modulus also has a value of over 1 tpa.
Raman spectroscopy and electrical transport measurements reveal the high quality of the. Apr 12, 2018 graphene, a twodimensional lattice of carbon atoms, has attracted enormous interest from a broad base of the research community for more than a decade. Jan 22, 20 aligned graphene nanoribbons and crossbars from unzipped carbon nanotubes. Graphene is a conductor, but gnrs express different electronic. Comparing atomic resolution images of scanning tunneling microscopy with the lattice of graphene, the edge structures of nanoribbons are identi. Aligned graphene nanoribbons and crossbars from unzipped carbon nanotubes. Width dependent edge distribution of graphene nanoribbons unzipped from multiwall carbon nanotubes z.
Recently, the discovery of producing graphene nanoribbons from chemically longitude unzipped carbon nanotubes proposed one possible way to obtain graphene nanoribbons on large scale. Supporting information graphene nanoribbons from unzipped. Aligned graphene nanoribbons and crossbars from unzipped carbon. Aligned graphene nanoribbon gnr arrays were made by unzipping of aligned singlewalled and fewwalled carbon nanotube. Carbon nanotubes cnts have a welldefined nanostructure to exhibit high. Oxidative unzipping of multiwall carbon nanotubes to graphene nanoribbons 12 april 2018 intercalationunzipping, oxidation, and exfoliation of carbon nanotubes credit. Aligned graphene nanoribbons and crossbars from unzipped. Transmission electron microscopy imaging of the graphene nanoribbons. Pdf graphene ribbon devices from unzipped carbon nanotubes. Graphene, or singlelayered graphite, with its high crystallinity and interesting semimetal electronic properties, has emerged as an exciting twodimensional.
Graphene oxide nanoribbons, as an intermediate product in this process, have interesting properties and are. Onestep oxidation preparation of unfolded and good soluble graphene nanoribbons by longitudinal unzipping of carbon nanotubes to cite this article. Oxidative unzipping of multiwall carbon nanotubes to. Mechanism of carbon nanotubes unzipping into graphene. Ding1,a 1national laboratory of solid state microstructures and department of physics, nanjing university, 22 hankou road, nanjing 210093, peoples republic of china. Pdf longitudinal unzipping of carbon nanotubes to form graphene. Apr 16, 2009 graphene nanoribbons gnrs, elongated strips of graphite an atom thick, are tipped for a starring role in future electronic devices. The allsemiconducting nature of sub10nm gnrs could bypass the problem of the extreme chirality dependence of the metal or semiconductor nature of carbon nanotubes cnts in future electronics1,2. Onestep oxidation preparation of unfolded and good. We investigated the atomic structures, raman spectroscopic and electrical transport properties of individual graphene nanoribbons gnrs, widths 1030 nm derived from sonochemical unzipping of multiwalled carbon nanotubes mwnts. Graphene nanoribbons were obtained by oxidative unzipping reaction conducted on multiwalled carbon nanotubes mwcnts. Aligned graphene nanoribbon gnr arrays have been made by unzipping of aligned singlewalled and fewwalled carbon nanotube cnt arrays.
Graphene nanoribbons from unzipped carbon nanotubes. Controllable unzipping for intramolecular junctions of. The production of multilayer graphene nanoribbons from. Atomic force microscope afm imaging and raman mapping on the same cnts before and after unzipping confirmed. The gnrs have smooth edges and a narrow width distribution 220 nm.
Nanotube unzipping was achieved by a polymerprotected ar plasma etching method, and the resulting nanoribbon array was transferred onto any substrates. Longitudinal unzipping of carbon nanotubes to form. Several lithographic, chemical and synthetic procedures are known to produce microscopic samples of graphene nanoribbons, and one chemical. Nov 30, 20 graphene nanoribbons have been widely studied for their potential applications in nanoelectronics. Pdf longitudinal unzipping of carbon nanotubes to form. Unzipping carbon nanotubes to nanoribbons for revealing. Origin and control of polyacrylonitrile alignments on carbon. Width dependent edge distribution of graphene nanoribbons unzipped from multiwall carbon nanotubes. Fluorinated graphene nanoribbons from unzipped singlewalled carbon nanotubes for ultrahigh energy density lithiumfluorinated carbon. These mechanical properties are anisotropic and would usually be discussed in two inplane directions, parallel and perpendicular to the onedimensional periodic.
Graphene nanoribbons gnrs from chemical unzipping of carbon nanotubes cnts have been reported to be a suitable candidate for lithium ion battery materials, but very few of them focused on controlling gnrs with di. Our results show that a partially unzipped carbon nanotube. Nov 05, 2020 graphitic multiwalled carbon nanotubes mwcnts are controllably unzipped into edgerich graphene nanoribbons to reveal the roles of edges and defects in persulfate activation for bisphenol a bpa oxidation. Longitudinal unzipping of carbon nanotubes to form graphene. We present the width dependent study of edge distribution of graphene nanoribbons unzipped from multiwall nanotubes. High temperature structural transformations of few layer. We investigated the atomic structures, raman spectroscopic and electrical transport properties of individual graphene nanoribbons gnrs, widths. Width dependent edge distribution of graphene nanoribbons.
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