He ion irradiation effects on multiwalled carbon nanotubes. Modifying the electronic structure of semiconducting. Jeet 22et al have irradiated swcnts and mwcnts by 55 mev carbon ions and observed the interesting phenomenon of ordering of the system at low fluences. Ion beam modification of carbon nanotube yarn in air and. Box 43, fi00014 helsinki, finland 2empa swiss federal laboratories for materials testing and research. Ion irradiation of carbon nanotubes encapsulating cobalt crystals. Radiological properties of nanocomposite fricke gel. Fabrication of carbon nanotube fieldeffect transistors with semiconductors as source and drain contact materials z. Formation of ionirradiationinduced atomicscale defects. Keinonen2 1moscow state engineering physics institute technical university, kashirskoe shosse 31, 115409 moscow, russia 2accelerator laboratory, p. Since the discovery of carbon nanotubes cnts in 1991 by iijima, a whole new discipline in. Carbon nanotubes definition of carbon nanotubes by the.
Carbon nanotubes applications of carbon nanotubes buckytubes. Modifying the electronic structure of semiconducting single. Highenergy ion irradiation can create defects, defects annealing depending on various parameters such as ion fluence and the energy loss of ions in the materials. Introduction to carbon nanotubes carbon nanotubes were discovered in 1991 by sumio iijima of nec and are effectively long, thin cylinders of graphite, which you will be familiar with as the material in a pencil or as the basis of some lubricants. Furthermore, the ion irradiated cnts exhibit excellent fe stability, showing promising prospects in practical applications. Graphite is made up of layers of carbon atoms arranged in a hexagonal lattice, like chicken wire see.
Defect formation in multiwalled carbon nanotubes under low. Irradiation stability of carbon nanotubes and related. The electric characteristics of individual multiwall carbon nanotubes mwnts irradiated with highly charged ions were evaluated. A photoelectron spectroscopy study of ionirradiation. As shown in figure 2, the contact resistance before irradiation is identical for the 10 and 60 nm swcnt structures 12. Samples of multiwalled carbon nanotubes mwnts were irradiated with 80 kev he ions.
Letters to the editor catalytic synthesis of carbon nanotubes under ion irradiation zhenxia wang a, yongqing wu a, wei zhang a, litao sun a, jiaguang han a, suixia he a, rongrong lu a, zhiyuan zhu a, yi chen b, xiaojing wu b, gang hu b a shanghai institute of applied physics, p. Experiments carried out for the technologically important carbon nanomaterials, such as nanotubes and graphene, showed that their atomic structure and morphology can be changed in a controllable manner by irradiation. Pdf effects of ion irradiation on carbon nanotubes. Low irradiation doses carbon nanotubes composites processed by ultrasound irradiation as anodes for lithium ion batteries. Multiwalled carbon nanotubes mwcnts were irradiated by 1. Applications of carbon nanotubes for lithium ion battery. Pdf damaged carbon nanotubes get healed by ion irradiation. Camino center for functional nanomaterials, brookhaven national laboratory, upton, ny 11973 proposal title. Hierarchical reinforcement of randomlyoriented carbon.
Jun 17, 2004 carbon nanotubes supplied by approved carbon nanotube supplier thomas swan carbon nanomaterials buckytubes also have applications in a variety of fuel cell components. The capability of graphitic networks to reorganize their structures under irradiation of energetic particles provides the tool for nano engineering of carbon nanotubes cnts. Electric characteristics of multiwalled carbon nanotubes. Open structure, ability to reorganize and heal defects, and large surfacetovolume ratio of carbon nanotubes affect materials radiation response so that it. The morphology and microstructure are investigated by scanning electron microscopy, transmission electron microscopy and raman spectroscopy. Tuning the conductance of singlewalled carbon nanotubes by. Ion irradiation for improved graphene network formation in. Recently, demonstrations have been made for nano machining, such as the cutting and welding of carbon nanotubes. Dispersion of carbon nanotubes in aluminum improves radiation resistance kang pyo soa, di chenb, akihiro kushimaa. Tuning the conductance of single walled carbon nanotubes by ion irradiation in the anderson localization regime c. Self ion al irradiation converts cnts to a metastable form of al 4c 3, but. A family of carbonbased nanocomposite tubular structures. These batteries release charge when lithium ions move between two electrodes one of which is graphite and the other is metal oxide.
Materials 20, 6 1140 inside of the nanotubes are susceptible to lithium intercalations, and achieved a high li density. Electrical conductivity carbon nanotubes film is a threedimensional film of tens of nanometer thickness, consisting of an interwoven mesh of singlewalled nanotubes, exhibiting uniform physical and electronic properties independent of the diameter, chirality, location, and direction of individual tubes making up the film due to ensemble averaging. Multiwall tubes can also be created if irradiation by electron beam is performed long enough. Application of carbon nanotubes cnts in various fields demands a thorough investigation of their stability under irradiation. Lin shao ion irradiation of carbon nanotubes is a tool that can be used to achieve modification of the structure. They have a number of properties including high surface area and thermal conductivity that make them useful as electrode catalyst supports in pem fuel cells. By employing molecular dynamics with analytical potentials we simulate irradiation of mwnts with various noble. Enhanced water transport occurs in a number of narrow pore channels, such as biological aquaporins. The production of amorphous regions in carbon nanotubes by. However, in spite of the experimental progress, the production of irradiation induced defects in multiwalled nanotubes mwnts and their properties are not yet well understood. Feb 01, 2008 welding of multiwalled carbon nanotubes by ion beam irradiation welding of multiwalled carbon nanotubes by ion beam irradiation ni, zhichun. Scanning electron microscopy sem inspection showed that the average outer diameters of the tube decreased as a result of ion irradiation. On the other hand, the damage has not been reported for graphite or mwcnts, as discussed in sec.
Cnt yarn was fabricated by drawing and spinning cnt sheets from a vertically aligned cnt forest. Pdf as recent transmission electron microscopy experiments demonstrate, electron irradiation can be used to create molecular junctions between carbon. Binding a carbon nanotube to the si100 surface using ion. Figure 1 shows sem images of the cnt sheet and yarns before irradiation.
We studied the effects ion beam irradiation on carbon nanotube cnt yarns. Amorphous molecular junctions produced by ion irradiation on carbon nanotubes. Ion irradiation has been known to be an effective tool for structure modification with micro nano scale precision. We investigated the influence of ion beam irradiation of the sic0001 surface on the growth of carbon nanotubes cnts by the sic surface decomposition method. Mar 04, 20 dose escalation study of carbon ion radiation for locality advanced carcinoma of the cervix.
In contrast to previous studies, the authors focused on water and ion transport through relatively short. Understanding the fundamental effects of ion irradiation on carbon nanotubes is critical for advancing this. Fabrication of carbon nanotube fieldeffect transistors with. A definition of carbon nanotubes, potential applications, the issue of massproduction and concerns about toxicity are considered. Krasheninnikov1,4 1materials physics division, university of helsinki, p. Google scholar ohno t, kato s, sasaki e, mizutani k, tsujii h.
Recent experiments on ion irradiation of carbon nanotubes have revealed a wealth of intriguing phenomena. Engineering of nanostructured carbon materials with electron or ion beams. Effect of electron beam irradiation on the tensile properties. Nanowelding of multiwalled carbon nanotubes on silicon and. Ion irradiation of individual carbon nanotubes deposited on substrates may be used for making metallic nanowires and studying effects of disorder on the electronic transport in lowdimensional systems. Additionally, these understanding may provide ways to tailor the properties of cnts via selective. Ion battery anode yunsong wang department of materials science and engineering, college of engineering, peking university, beijing, 100871 china. Tailoring the electrochemical behavior of multiwalled. The high energy ion irradiation impact on carbon nanotubes. The interaction of energetic ions with carbon nanotubes plays a fundamental role both in the field of ion beam irradiation and in nanoscience. Irradiation stability of carbon nanotubes was studied by ion.
Apr 01, 2010 in the drive to devise more efficient and durable batteries, one promising option uses carbon nanotubes, which not only can store far more electricity by weight than lithium ion batteries but also. Reduction of graphene oxide by 100 mev au ion irradiation and. Contrary to the case of low fluence irradiation, the defects produced during the high fluence irradiation could not be observed individually, and the surface of nanotubes became rough. The influence of carbon nanotubes on the irradiation damage. The irradiation experiments with medium ion energies 40500kev were carried out at high temperatures and combined with transmission electron microscopy and. Phonon transport assisted by intertube carbon displacements. Please also visit our carbon nanotubes properties and applications guide here.
The rising interest in irradiation effects in carbon nanostructures is triggered, for instance, by recent observations of intriguing irradiation induced. A quite surprising result which emerges from the double ion catalytic ion and impacted ion irradiation experiments is that cnts are found on the surface of carbon target. Production of defects in supported carbon nanotubes under. Nanowelding of multiwalled carbon nanotubes on silicon. The radiological properties of nanocomposite fricke gel ncfg dosimeters prepared with different concentrations of nano clay, perchloric acid and ferrous ions in deaerated conditions were investigated under carbon and argon ion beam irradiation covering a linearenergytransfer let range of 10 to 3000 evnm. Nichols, hiroaki saito, mark hoefer, and prabhakar r. The production of amorphous regions in carbon nanotubes irradiated with 140 kev he ions was studied using raman spectroscopy and transmission electron microscopy tem. Production of defects in supported carbon nanotubes under ion. In order to clarify which sites are more favorable for lithium adsorption, senani et al. Hyperporous sponge interconnected by hierarchical carbon.
Here is introduced the ion irradiation method to open and close the tubes and to fill the tubes with elements. Ion irradiation effects on carbon nanotubes nasaads. Nano welding of multiwalled carbon nanotubes on silicon and silica surface by laser irradiation yanping yuan 1,2, and jimin chen 1,2 1 institute of laser engineering, beijing university of technology, beijing 100124, china. Proton irradiation of carbon nanotubes nano letters. Tuning the conductance of singlewalled carbon nanotubes by ion. Hyperporous sponge interconnected by hierarchical carbon nanotubes as a high. A widely used method to create defects in carbon nano structures is the irradiation with energetic particles such as electrons or ions see ref. Dispersion of carbon nanotubes in aluminum improves. It is found that the fe performance of the ion irradiated cnts. Lithium titanatecarbon nanotubes composites processed by.
Box 800204, shanghai 201800, pr china b department of material science, fudan university, shanghai 200433, pr china. Molecular dynamics simulations support the experimentally obtained results and the proposed mechanisms. Ion irradiation with energetic particles can successfully be used for changing the properties of carbon nanotubes cnts by functionalising, connecting, and creating defect structures in the cnts. The understanding of energetic ion beam effects on cnts is thus of great importance. With increasing ion fluence, the radial breathing modes rbms of the outer tubes either semiconducting or metallic disappeared before the respective rbm bands from the inner tubes, suggesting that the outer nanotubes are more affected than the inner nanotubes by the ion irradiation.
Effective changes in the transport properties of nanotubes have been observed after highdose ion irradiation of nanotubes. Ion irradiation of individual carbon nanotubes deposited on substrates may be used for making metallic nanowires and studying effects of. An inductively coupled plasma icp was used as the process source, operating the pressure 1 mtorr of ar or n 2 for opening and closing the nanotubes, and adding cs into the plasma for the doping process. Modeling ionirradiation reinforcement of dwcnt random networks. Performance of a low energy ion source with carbon nanotube. The engineering of hot carbon nanotubes with a focused. Upper bound to the thermal conductivity of carbon nanotube pellets. Rochefort, nano cerca, university of montreal, canada. Damaged carbon nanotubes get healed by ion irradiation article pdf available in journal of applied physics 108 august 2010 with 167 reads how we measure reads.
Figuring out the underlying relationship between the field emission fe properties and the ion irradiation induced structural change of carbon nanotubes cnts is of great importance in developing highperformance field emitters. This limitation has been recently addressed by applying highenergy electron irradiation, which crosslinks inner shells and tubes, and effectively increases the strength of these materials to. Four kinetic energy formulas for studying the interaction. Among related carbon materials, lowenergy electron and photon irradiation induced structural change polymerization is known to occur for fullerenes. Tuning the conductance of singlewalled carbon nanotubes.
Amorphous molecular junctions produced by ion irradiation. At low ion doses low defect density an increase in spectral intensity near the fermi level e f is observed, associated with formation of localized defectrelated states. Batteries most portable electronic devices use rechargeable lithium ion batteries. Lithium titanate carbon nanotubes composites processed by ultrasound irradiation as anodes for lithium ion. Carbon nanotubes enhance the radiation resistance of bcc. In order to understand the basic physical mechanisms of radiation damage production in supported nanotubes, we employ molecular dynamics and simulate ion impacts on.
Carbon nanotube technology also holds promise for a wide range of energyrelated applications. Pdf ionirradiation induced welding of carbon nanotubes. Lowenergy irradiation damage in singlewalled carbon nanotubes. We report a unique approach for the fabrication of a family of curling tubular nanostructures rapidly created by a rolling up of carbon membranes under in situ tem electron beam irradiation. Carbon ion radiotherapy for vaginal malignant melanoma. View carbon nano tubes research papers on academia. Irradiation with ions introduces a number of structural defects, with the most common being vacancies in single and multiwalled carbon nanotubes. The samples were also characterized using raman spectrometry by analysis of the intensity of main bands in the spectra of virgin and irradiated mwnt samples. A he ion implantation experiment in graphenew multilayer materials revealed. Ionbeam irradiation effect on the growth of carbon. This general approach can be extended to curve the conductive carbon film loaded with various functional. Tuning the conductance of single walled carbon nanotubes.
Catalytic synthesis of carbon nanotubes under ion irradiation. However, we have recently shown that ar ion irradiation in a limited energy window of 1025 ev may enhance the initial cap nucleation process, when the carbon network is in contact with the metal nanocatalyst. The irradiated areas have been characterised by correlative raman. The mechanical, structural, electronic and magnetic properties of carbon nanotubes can be modified by electron or ion irradiation. Electrical behaviour of carbon nanotubes under lowenergy proton irradiation. Welding of multiwalled carbon nanotubes by ion beam irradiation. Dispersion of carbon nanotubes in aluminum improves radiation resistance. It has been demonstrated that irradiation, especially when combined with heat treatment, can also have beneficial effects on nanostructured materials. Ion beam modification of carbon nanotube yarn in air and vacuum. At low ion irradiation fluence, intertube thermal transport enhancement leads to thermal conductivity increase by factor 5, while at high ion irradiation fluence point defects within tubes cause a decrease in thermal conductivity. The most common form of nanotube, composed entirely of carbon atoms or cylindrical fullerenes, with numerous applications in nanotechnology. Here it is shown that silicon heteroatoms introduced via plasma irradiation into the lattice of singlewalled carbon nanotubes swcnts can be manipulated using a focused 5560 kev electron probe aimed at neighboring carbon sites. Experiments and molecular dynamics have demonstrated that electron irradiation could create molecular junctions between crossed singlewall carbon nanotubes. Recently molecular dynamics computation predicted that ion irradiation could also join.
Radiation effects can induce different kinds of defects in carbon nanotubes, such as substitutional, interstitial, single, and multiple vacancies, which in. Irradiation damage determined field emission of ion. Carbon nanotubes history and production methods cheap tubes. Carbon nano tubes synonyms, carbon nano tubes pronunciation, carbon nano tubes translation, english dictionary definition of carbon nano tubes. Tailoring the electrochemical behavior of multiwalled carbon nanotubes through argon and hydrogen ion irradiation jeffrey a. Only carbon nanotubes will be covered in this white paper. Introduction carbon nanotube cnt, a quasionedimensional material. The response of multiwalled carbon nanotubes encapsulating co nanorods to ion irradiation was studied. Nano 3 results and discussion carbon nanotube sheets nanocomp and cnt yarns general nano and nanocomp were irradiated to determine the effect of irradiation dose on the tensile properties. Crossed nanotubes on a substrate before ion bombardment c development of the force exerted by the upper tube on the lower one due to the irradiation induced pinning of the nanotubes to the substrate d. Bandaruz materials science program, department of mechanical and aerospace engineering, university of california. Open structure, ability to reorganize and heal defects, and large surfacetovolume ratio of carbon nanotubes affect materials radiation response so. Ion irradiation of carbon nanotubes very often leads to defect formation. Formation of ionirradiation induced atomicscale defects on walls of carbon nanotubes a.
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