Numerical modeling of dielectrophoresis yuan lin 2006 kth mechanics se100 44 stockholm, sweden abstract we investigate the dielectrophoretic separation of microparticles. Manipulation of carbon nanotubes using ac dielectrophoresis. Keywords singlewalled carbon nanotubes swnt dielectrophoresis dep thin. Dielectrophoresis on surfactantstabilized singlewalled carbon nanotube swnt suspensions has been demonstrated to separate metallic from semiconducting tubes by their different electric fieldinduced polarizabilities. Carbon nanotubes are a hollow, cylindrical form of elemental carbon that was discovered by sumio iijima in 1991 1.
Floatingpotential dielectrophoresiscontrolled fabrication. This method can be conducted at room temperature with low voltages. High tensile modulus of carbon nanotube nanofibers produced. These properties make carbon nanotubes wellsuited for a wide range of applications. Controlling the structure and properties of carbon nanotubes. Can we optimize arc discharge and laser ablation for well.
Study of the alignment of multiwalled carbon nanotubes. The mechanisms and experimental setup of three methods for controlled dep assembly of cnts are introduced. The swnts predominately bridge the shortest gap between the two electrodes and the spatial distribution of the tubes becomes wider. This study reports a new approach for assembling carbon nanotubes cnts between electrodes combination of optically induced dielectrophoresis force and dielectrophoresis force. The successful manipulation and assembly of single carbon nanotubes cnts using dielectrophoretic forces produced by nanoelectrodes will lead to a higher integration of cnt s into both nanoelectronics and nems. Khondaker 1,2,3 1 nanoscience technology center, 2 department of physics, 3school of electrical engineering and computer science. Dielectrophoresis dep is an effective method to assemble cnts across a pair of electrical conductors for various applications. Here we report that the interaction between swnts and the surfactant induces a nanotube surface conductance which gives rise to a unique electric field frequency dependence of. Carbon nanotubes cnts are promising materials for many applications due to their attractive electronic, optical, mechanical and thermal properties. Carbon nanotubes also are stable at high temperatures and have very high thermal conductivities. Carbon nanotubes as electrodes for dielectrophoresis of dna. Assembly of carbon nanotubes between electrodes by.
All particles exhibit dielectrophoretic activity in the presence of electric fields. The fabrication of carbon nanotube electronic circuits. Apr 14, 2009 a selflimiting dielectrophoresis technique, aimed at deterministically assembling individual or bundles of singlewalled carbon nanotubes swcnts and multiwalled carbon nanotubes mwcnts, is experimentally investigated. Various techniques have been found to be effective for the deposition of cnts on substrate such as dielectrophoresis 59. The role of electric field and ultrasonication in the. The absolute value of xyz 2 2, of all the chiral nano tubes in the photon energy range of 0. Khondaker 1,2,3 1 nanoscience technology center, 2 department of physics, 3school of electrical engineering. Advances in model development for carbon nanotube assembly.
Fabrication of carbon nanotube fieldeffect transistors with. Fabrication of carbon nanotube fieldeffect transistors with semiconductors as source and drain contact materials z. In situ and real time determination of metallic and semiconducting singlewalled carbon nanotubes in suspension via dielectrophoresis natacha mureau, ernest mendoza, and s. The number of swnts bridging the two electrodes is controlled by swnt concentration of the suspension and deposition time. Modeling of dielectrophoresis in micro and nano systems. All particles exhibit dielectrophoretic activity in the presence of. Cnts are especially promising as new materials for a variety of potential applications. Highdensity integration of carbon nanotubes via chemical. Some tubes show bambooshaped structural features arrows. By utilizing moving light patterns, the cnts could be collected to the central area between two metal electrodes. With no functionalization, dep has the potential of separating metallicsinglewalled carbon nanotubes swcnts and semiconductingswcnts 16, aligning carbon nanotubes between microelectrodes 17, and realizing. Highdensity integration of carbon nanotubes via chemical selfassembly hongsik park,aliafzali, shujen han. Progress towards the automatic assembly of carbon nanotubes.
These carbon tubes are typically one to several nanometers in diameter and tens of microns in length, although nanotubes as long as several centimeters have been synthesized. Hermana nanoscale science and engineering center, columbia university, new york, new york 10027. Singlewall carbon nanotubes swnts suspended in isopropyl alcohol are placed between two crossstructured electrodes using an ac dielectrophoresis technique. Based on the structures and dimensions, cnts can be divided into two groups. Precise positioning of singlewalled carbon nanotubes by ac dielectrophoresis sarbajit banerjee, brian e. The mwcnts demonstrate a positive dep behaviour and can be trapped at the regions. Hsuehchia chang bacteria capture, concentration and. With this approach, we assembled a high density of carbonnanotube transistors in a conventional semiconductor fabrication line and then electri. The separation of multiwalled carbon nanotubes mwcnts and polystyrene microparticles using a dielectrophoresis dep system is presented. Camino center for functional nanomaterials, brookhaven national laboratory, upton, ny 11973 proposal title. May 30, 2008 singlewalled carbon nanotubes tend to be produced in polydisperse mixtures with different lengths, diameters and electronic properties. A study of deterministic positioning of carbon nanotubes by. Related content use of dielectrophoresis in the fabrication of an afm tip with a cnt jieun kim and changsoo han. As a result of the intense research activity, new types of the carbon nanostructures, such as nanoonions 3 and nanohorns 410, have been also discovered.
Selective deposition and alignment of singlewalled carbon. Micro and nanorobotic assembly using dielectrophoresis. Fabrication of carbon nanotube field effect transistors by ac. Watch to learn about dielectrophoresis, a physical phenomenon that reveals a ton of information about biological systems. Single wall carbon nanotubes swnts suspended in isopropyl alcohol have been placed between two electrodes by ac dielectrophoresis method. Progress towards monodisperse singlewalled carbon nanotubes. Silva advanced technology institute, nanoelectronics centre, university of surrey, guildford. The synthesized tubes are then separated from each other as swcnts or fewwalled carbon nanotubes fwcnt or mwcnt, and the individual nanotube is purified and transferred to a predefined area of target substrate. With no functionalization, dep has the potential of separating metallicsinglewalled carbon nanotubes swcnts and semiconductingswcnts 16, aligning carbon nanotubes between microelectrodes 17, and realizing largescale manipulation 18. The dep system consists of arrays of parallel microelectrodes patterned on a glass substrate. A selflimiting dielectrophoresis technique, aimed at deterministically assembling individual or bundles of singlewalled carbon nanotubes swcnts and multiwalled carbon nanotubes mwcnts, is experimentally investigated. High tensile modulus of carbon nanotube nanofibers. Fabrication of carbon nanotube field effect transistors by.
It is a process often used to manipulate and assemble. Developing automatic assembly techniques is essential for the application of advanced nanomaterials such as carbon nanotubes cnts. Precise positioning of singlewalled carbon nanotubes by. Maria dimaki and peter boggild 2004 nanotechnology 15 1095 view the article online for updates and enhancements. Selfaligned tgate highpurity article semiconducting. The first is an electrophoretic force due to charge, the second is the dielectrophoretic force due to the dielectric constant difference between cnts. The performance of the system is evaluated by means of numerical simulations. Other tubes may then connect to the edgeattached tubes. As suggested by its name, during the dielectrophoresis process, the.
Floatingpotential dielectrophoresiscontrolled fabrication of singlecarbonnanotube transistors and their electrical properties lifeng dong, vachara chirayos, jocelyn bush, jun jiao, valery m. Early research demonstrates that the polarization along the longitudinal direction is much higher than that along the transverse direction for metallic cnts, but comparable for semiconducting cnts padmaraj et al. The purpose of this study is to investigate the feasibility of fabricating cnt afm tips by dielectrophoresis. Electronic circuits can be fabricated using the ptype carbon nanotube fieldeffect transistors. Singlewalled carbon nanotubes tend to be produced in polydisperse mixtures with different lengths, diameters and electronic properties. Nano letters rapid and reproducible fabrication of carbon. Dielectrophoresis aligned singlewalled carbon nanotubes as. Application of dielectrophoresis to fabrication of carbon. The alignment of carbon nano tube between aluminum. Oct 01, 2016 singlewalled carbon nanotube mesh networks can be aligned and deposited with dielectrophoresis. Dielectrophoresis assembling cancer cells in a 3d microfluidic model.
A study of deterministic positioning of carbon nanotubes. Currently, the main challenge facing their widespread usage is the inability to fabricate nanotube devices reproducibly. It can also be used to capture particles by applying positive dielectrophoresis 10 and attract and position carbon nano tubes cnts 11, 12. By repeating the process for the formation of the pd electrodes after the. As a new type of materials, carbon nanotubes cnts have been intensively studied due to their outstanding properties. Metal electrodes and amorphous silicon layer were first patterned and then used to assemble cnts. Ultrahigh density alignment of carbon nanotubes array by. Alternating current dielectrophoresis of carbon nanotubes. Fabrication of carbon nanotube fieldeffect transistors. Dielectrophoretic deposition and alignment of carbon. Dielectrophoretic separation of carbon nanotubes and. Since a high frequency ac bias was used here, the electrophoretic force did not affect the motion of the cnts because of time averaging effect. Scaling parallel dielectrophoresis of carbon nanotubes. Fabrication of carbon nanotube structures using dielectrophoresis.
It was then demonstrated that dielectrophoresis allows for a electronic type speci. A limiting resistor is used to control the electric. Silva advanced technology institute, nano electronics centre, university of surrey, guildford, surrey gu2 7xh, england kai f. Request pdf manipulation of carbon nanotubes using ac dielectrophoresis singlewall carbon nanotubes swnts suspended in isopropyl alcohol are placed between two crossstructured electrodes. The dielectrophoresis method could be used for the waferscale fabrication of carbon nanotubebased nanoelectronics. Presented is the dielectrophoresis of multiwalled carbon nanotubes on piezoelectric substrates patterned with gold inter digitated electrodes.
Advances in model development for carbon nanotube assembly by. A novel approach to dielectrophoresis using carbon electrodes rodrigo martinezduarte1,2, philippe renaud2 and marc j. Assembly of carbon nanotubes between electrodes by utilizing. Dielectrophoresis dep is a phenomenon in which a force is exerted on a dielectric particle when it is subjected to a nonuniform electric field. The alignment of carbon nano tube between aluminum electrodes using ac dielectrophoresis method low foo wah, nur hamidah abdul halim, prof. The carbon nanotube cnt is a unique form of carbon material. In dep, cnts suspended in dielectric liquid medium suffer a force imbalance due to induced dipole moment when subject to an externally applied non. Dielectrophoresis aligned singlewalled carbon nanotubes.
Request pdf alternating current dielectrophoresis of carbon nanotubes we report on the deposition of individual semiconducting singlewalled carbon nanotubes sswnts, suspended in an aqueous. Singlewalled carbon nanotube mesh networks can be aligned and deposited with dielectrophoresis. Two forces can drive cnts in the suspension to the electrodes. Dielectrophoresis when a polarizable object is subjected to an electric. Uda hashim, nuzaihan md nor, shahidah arina shamsuddin institute of nano electronic engineering inee universiti malaysia perlis unimap 0 kangar, perlis, malaysia. Dielectrophoresis of carbon nanotubes using microelectrodes. Dielectrophoresis dep is currently used to separate, manipulate and detect micro particles in several domains with high speed and precision, such as in biological cell or carbon nano tubes. Nano letters rapid and reproducible fabrication of.
Insights into the dielectrophoretic nanotubenanotube interactions bin yang et althis content was. This force does not require the particle to be charged. The alignment of carbon nano tube between aluminum electrodes. Dielectrophoresis dep is a versatile method for the fabrication of nanostructures from a solution. Precise positioning of carbon nanotubes by ac dielectrophoresis using. The nanotubes consisted of up to several tens of graphitic shells socalled multiwalled carbon nanotubes mwnts with adjacent shell separation of 0. Index terms microassembly, nanoassembly, mems, nems, dielectrophoresis, carbon nanotubes i.
Singlewalled carbon nanotube networks using dielectrophoresis 160. The uid dynamics involved and the dielectric properties of water inside singlewalled carbon nanotube are studied as well. Graphite is made up of layers of carbon atoms arranged in a hexagonal lattice, like chicken wire see. Recently, researchers have shown that dielectrophoresis dep is an efficient technique to manipulate carbon nanotubes 15,16. Pdf carbon nanotubes as electrodes for dielectrophoresis. A novel approach to dielectrophoresis using carbon electrodes. Selfaligned tgate highpurity article semiconducting carbon. Some of these applications now are beginning to reach commercial maturity, with carbon nanotubes being used as probe tips for atomic force microscopes and as field. Precise positioning of singlewalled carbon nanotubes by ac. An experiment was designed to measure the degree of alignment of dispersed singlewalled carbon nanotubes under variation of the applied electric. Modeling of dielectrophoresis in micro and nano systems yuan lin 2008 kth mechanics se100 44 stockholm, sweden abstract this thesis presents models and simulations of dielectrophoretic separation of micro and nano particles. Theoretical simulation on the assembly of carbon nanotubes. The role of some key parameters such as voltage and duration of.
In situ and real time determination of metallic and. Principle of dielectrophoresis deposition and alignment of a carbon nanotube. The swnts are found to attach to the electrodes along the direction of the ac external electric field. Since its discovery, cnt has been intensively studied due to its remarkable electrical, mechanical, thermal, and chemical properties iijima, 1991. Dielectrophoresis, a simple but versatile method, has proven to be effective in organizing singlewalled carbon nanotubes swnts in small and large scales, resulting in devices with predictable properties and performance 19,20. 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. This process results in a chain which may form an electrical connec tion between electrodes even if the electrode gap size is greater than the length of the nanotubes. The fabrication of carbon nanotube electronic circuits with. An alternating current oscillating at frequencies of 1 khz and 150 khz at a peaktopeak pp voltage of 1v to 10v was applied to the electrodes, aligning carbon nanotubes suspended in droplets of. The role of some key parameters such as voltage and duration.