The capability of graphitic networks to reorganize their structures under irradiation of energetic particles provides the tool for nano engineering of carbon nanotubes cnts. Self ion al irradiation converts cnts to a metastable form of al 4c 3, but. By employing molecular dynamics with analytical potentials we simulate irradiation of mwnts with various noble. Aug 27, 2005 carbon nanotubes, also called buckytubes, are cylinders made up of pure carbon molecules, whose unique properties make them very attractive to many different industries. Ion beam modification of carbon nanotube yarn in air and. 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. Among related carbon materials, lowenergy electron and photon irradiation induced structural change polymerization is known to occur for fullerenes. These batteries release charge when lithium ions move between two electrodes one of which is graphite and the other is metal oxide. Ion irradiation of carbon nanotubes very often leads to defect formation. 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.
Modeling ionirradiation reinforcement of dwcnt random networks. Since the discovery of carbon nanotubes cnts in 1991 by iijima, a whole new discipline in. Graphite is made up of layers of carbon atoms arranged in a hexagonal lattice, like chicken wire see. Upper bound to the thermal conductivity of carbon nanotube pellets. A photoelectron spectroscopy study of ionirradiation. 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. Pdf damaged carbon nanotubes get healed by ion irradiation.
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. Feb 01, 2008 welding of multiwalled carbon nanotubes by ion beam irradiation welding of multiwalled carbon nanotubes by ion beam irradiation ni, zhichun. This general approach can be extended to curve the conductive carbon film loaded with various functional. Irradiation with ions introduces a number of structural defects, with the most common being vacancies in single and multiwalled carbon nanotubes.
Pdf as recent transmission electron microscopy experiments demonstrate, electron irradiation can be used to create molecular junctions between carbon. 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. The mechanical, structural, electronic and magnetic properties of carbon nanotubes can be modified by electron or ion irradiation. Pdf ion irradiation with energetic particles can successfully be used for changing the properties of carbon nanotubes cnts by functionalising. Formation of ionirradiation induced atomicscale defects on walls of carbon nanotubes a. 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.
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. In order to clarify which sites are more favorable for lithium adsorption, senani et al. Pdf effects of ion irradiation on carbon nanotubes. A widely used method to create defects in carbon nano structures is the irradiation with energetic particles such as electrons or ions see ref. The irradiated areas have been characterised by correlative raman. 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. The production of amorphous regions in carbon nanotubes by. Google scholar ohno t, kato s, sasaki e, mizutani k, tsujii h. Lowenergy irradiation damage in singlewalled carbon nanotubes. The most common form of nanotube, composed entirely of carbon atoms or cylindrical fullerenes, with numerous applications in nanotechnology.
A definition of carbon nanotubes, potential applications, the issue of massproduction and concerns about toxicity are considered. Recently, demonstrations have been made for nano machining, such as the cutting and welding of carbon nanotubes. Bandaruz materials science program, department of mechanical and aerospace engineering, university of california. Please also visit our carbon nanotubes properties and applications guide here. Experiments and molecular dynamics have demonstrated that electron irradiation could create molecular junctions between crossed singlewall carbon nanotubes. 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. Ion irradiation of carbon nanotubes encapsulating cobalt crystals. Krasheninnikov1,4 1materials physics division, university of helsinki, p. Batteries most portable electronic devices use rechargeable lithium ion batteries. 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.
Nanowelding of multiwalled carbon nanotubes on silicon. Fabrication of carbon nanotube fieldeffect transistors with semiconductors as source and drain contact materials z. The present report is concerned with the field emission properties of ion irradiated multiwalled carbon nanotubes mwcnts and doublewalled carbon nanotubes dwcnts. Ion battery anode yunsong wang department of materials science and engineering, college of engineering, peking university, beijing, 100871 china. Recently molecular dynamics computation predicted that ion irradiation could also join. Irradiation damage determined field emission of ion. Applications of carbon nanotubes for lithium ion battery. Phonon transport assisted by intertube carbon displacements. Tuning the conductance of single walled carbon nanotubes by ion irradiation in the anderson localization regime c. The production of amorphous regions in carbon nanotubes by 140 kev he ion irradiation. 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. Modifying the electronic structure of semiconducting single.
The influence of carbon nanotubes on the irradiation damage. Camino center for functional nanomaterials, brookhaven national laboratory, upton, ny 11973 proposal title. Tuning the conductance of singlewalled carbon nanotubes by ion irradiation in the anderson localization regime. Dispersion of carbon nanotubes in aluminum improves radiation resistance. Four kinetic energy formulas for studying the interaction. Ion irradiation has been known to be an effective tool for structure modification with micro nano scale precision. 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. Hyperporous sponge interconnected by hierarchical carbon nanotubes as a high. Structural deformation of carbon nanotubes using energetic.
Proton irradiation of carbon nanotubes nano letters. The high energy ion irradiation impact on carbon nanotubes. Welding of multiwalled carbon nanotubes by ion beam irradiation. The production of amorphous regions in carbon nanotubes irradiated with 140 kev he ions was studied using raman spectroscopy and transmission electron microscopy tem. Keinonen2 1moscow state engineering physics institute technical university, kashirskoe shosse 31, 115409 moscow, russia 2accelerator laboratory, p. Radiation effects can induce different kinds of defects in carbon nanotubes, such as substitutional, interstitial, single, and multiple vacancies, which in. The electric characteristics of individual multiwall carbon nanotubes mwnts irradiated with highly charged ions were evaluated.
Formation of ionirradiationinduced atomicscale defects. Ion beam modification of carbon nanotube yarn in air and vacuum. View carbon nano tubes research papers on academia. Figure 1 shows sem images of the cnt sheet and yarns before irradiation. Production of defects in supported carbon nanotubes under. Rochefort, nano cerca, university of montreal, canada. Electric characteristics of multiwalled carbon nanotubes. We studied the effects ion beam irradiation on carbon nanotube cnt yarns. Open structure, ability to reorganize and heal defects, and large surfacetovolume ratio of carbon nanotubes affect materials radiation response so. Tuning the conductance of singlewalled carbon nanotubes. Dispersion of carbon nanotubes in aluminum improves. Irradiation stability of carbon nanotubes and related. Lithium titanate carbon nanotubes composites processed by ultrasound irradiation as anodes for lithium ion. Hierarchical reinforcement of randomlyoriented carbon.
Radiological properties of nanocomposite fricke gel. Enhanced water transport occurs in a number of narrow pore channels, such as biological aquaporins. Tuning the conductance of singlewalled carbon nanotubes by ion. Application of carbon nanotubes cnts in various fields demands a thorough investigation of their stability under irradiation. Effect of electron beam irradiation on the tensile properties. Catalytic synthesis of carbon nanotubes under ion irradiation. Binding a carbon nanotube to the si100 surface using ion. Carbon nanotubes enhance the radiation resistance of bcc. Fabrication of carbon nanotube fieldeffect transistors with. Nichols, hiroaki saito, mark hoefer, and prabhakar r. 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.
The understanding of energetic ion beam effects on cnts is thus of great importance. 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. On the other hand, the damage has not been reported for graphite or mwcnts, as discussed in sec. Introduction carbon nanotube cnt, a quasionedimensional material. 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. Production of defects in supported carbon nanotubes under ion. 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 ion radiotherapy for vaginal malignant melanoma.
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. Ionbeam irradiation effect on the growth of carbon. Carbon nanotube technology also holds promise for a wide range of energyrelated applications. Multiwall tubes can also be created if irradiation by electron beam is performed long enough. Lin shao ion irradiation of carbon nanotubes is a tool that can be used to achieve modification of the structure. Low irradiation doses carbon nanotubes composites processed by ultrasound irradiation as anodes for lithium ion batteries. Only carbon nanotubes will be covered in this white paper. 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. 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. Electrical behaviour of carbon nanotubes under lowenergy proton irradiation. 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. Ion irradiation effects on carbon nanotubes nasaads. Box 800204, shanghai 201800, pr china b department of material science, fudan university, shanghai 200433, pr china.
Carbon nanotubes history and production methods cheap tubes. 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. The morphology and microstructure are investigated by scanning electron microscopy, transmission electron microscopy and raman spectroscopy. 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. The response of multiwalled carbon nanotubes encapsulating co nanorods to ion irradiation was studied. Ion irradiation of individual carbon nanotubes deposited on substrates may be used for making metallic nanowires and studying effects of. Tailoring the electrochemical behavior of multiwalled. 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. Carbon nanotubes definition of carbon nanotubes by the. Scanning electron microscopy sem inspection showed that the average outer diameters of the tube decreased as a result of ion irradiation.
It has been demonstrated that irradiation, especially when combined with heat treatment, can also have beneficial effects on nanostructured materials. Hyperporous sponge interconnected by hierarchical carbon. Furthermore, the ion irradiated cnts exhibit excellent fe stability, showing promising prospects in practical applications. Dispersion of carbon nanotubes in aluminum improves radiation resistance kang pyo soa, di chenb, akihiro kushimaa. As shown in figure 2, the contact resistance before irradiation is identical for the 10 and 60 nm swcnt structures 12. Open structure, ability to reorganize and heal defects, and large surfacetovolume ratio of carbon nanotubes affect materials radiation response so that it. 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. A family of carbonbased nanocomposite tubular structures. Carbon nanotubes applications of carbon nanotubes buckytubes. He ion irradiation effects on multiwalled carbon nanotubes. Cnt yarn was fabricated by drawing and spinning cnt sheets from a vertically aligned cnt forest. Defect formation in multiwalled carbon nanotubes under low.
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. 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. Effective changes in the transport properties of nanotubes have been observed after highdose ion irradiation of nanotubes. Modifying the electronic structure of semiconducting. Amorphous molecular junctions produced by ion irradiation on carbon nanotubes. Pdf ionirradiation induced welding of carbon nanotubes. Reduction of graphene oxide by 100 mev au ion irradiation and. Amorphous molecular junctions produced by ion irradiation. Understanding the fundamental effects of ion irradiation on carbon nanotubes is critical for advancing this. Here is introduced the ion irradiation method to open and close the tubes and to fill the tubes with elements. Multiwalled carbon nanotubes mwcnts were irradiated by 1. 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. Additionally, these understanding may provide ways to tailor the properties of cnts via selective. Molecular dynamics simulations support the experimentally obtained results and the proposed mechanisms.
Materials 20, 6 1140 inside of the nanotubes are susceptible to lithium intercalations, and achieved a high li density. Performance of a low energy ion source with carbon nanotube. Lithium titanatecarbon nanotubes composites processed by. Irradiation stability of carbon nanotubes was studied by ion. In contrast to previous studies, the authors focused on water and ion transport through relatively short. Ion ranges and irradiationinduced defects in multiwalled. Engineering of nanostructured carbon materials with electron or ion beams.
Box 43, fi00014 helsinki, finland 2empa swiss federal laboratories for materials testing and research. Tuning the conductance of singlewalled carbon nanotubes by. The interaction of energetic ions with carbon nanotubes plays a fundamental role both in the field of ion beam irradiation and in nanoscience. Carbon nano tubes synonyms, carbon nano tubes pronunciation, carbon nano tubes translation, english dictionary definition of carbon nano tubes.
Tuning the conductance of single walled carbon nanotubes. Ion irradiation for improved graphene network formation in. The irradiation experiments with medium ion energies 40500kev were carried out at high temperatures and combined with transmission electron microscopy and. 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. Mar 04, 20 dose escalation study of carbon ion radiation for locality advanced carcinoma of the cervix. The rising interest in irradiation effects in carbon nanostructures is triggered, for instance, by recent observations of intriguing irradiation induced. Recent experiments on ion irradiation of carbon nanotubes have revealed a wealth of intriguing phenomena.
1185 1320 390 786 681 201 1314 1454 239 170 172 638 273 885 1168 515 909 1444 1543 1062 45 1195 505 183 315 397 1297 979 628 834 166 1451 761 1163 851