semi empirical simulations of carbon nanotube properties under electronic

... thermo-physical properties of a carbon nanotube suspension (carbon nanofluid) Nanotechnology 2008, 19:315701 18 Yang Y, Grulke EA, Zhang ZG, Wu G: Thermal and rheological properties of carbon nanotube- in-oil ... conductivity of the nanofluids increases nonlinearly, with the maximum enhancement of 23% at sonication time of 1,355 However, the viscosity of nanofluids increases to the maximum at sonication time of ... rheological properties of carbon nanotube suspensions Binglu Ruan*1,2 and Anthony M Jacobi1 Mechanical Science and Engineering, University of Illinois, Urbana, IL, 61801-2906, USA Department of Thermal...

Ngày tải lên: 21/06/2014, 17:20

... orientation of nanotubes is largely dependent on the local geometry of the substrate This was further confirmed by the orientation of CNTs near the edge of the substrates Most of the nanotubes were ... diameter of the BS-CNTs was estimated in the range of 30–70 nm However, some of the CNTs were of very large diameter (*150 nm) The tip diameters were in the range of 5–20 nm The magnified view of a ... input microwave power of 500 W, operating pressure of Torr, and NH3 flow rate of 40 sccm For growth, C2H2 was introduced at a flow rate of 20 sccm keeping other parameters constant Under these conditions,...

Ngày tải lên: 22/06/2014, 01:20

... the mechanical properties and behaviour of CNTs are reported 1.1 Properties and applications of carbon nanotubes 1.1.1 Geometric properties of carbon nanotubes Multi-walled carbon nanotube (MWCNT) ... Geometric properties of carbon nanotubes 1.1.2 Mechanical properties of CNT and its characterization 1.1.3 Applications of CNT 12 1.2 Computational models to study mechanics of carbon ... of carbon nanotubes 15 1.2.1 Atomistic models of carbon nanotubes 16 1.2.2 Continuum models of CNT 19 1.3 Literature review 22 1.3.1 Atomistic simulations of compression...

Ngày tải lên: 09/09/2015, 11:19

... et al Figure Morphology of CNTs grown under different dc bias voltages FESEM images of CNTs grown under (a) -200 V, (b) -100 V, and (c) V (d) TEM images of CNTs grown under V (inset shows a higher ... to evaluate the quality of the CNTs Yoshida et al.32 have shown that the FWHM intensity of the G-band reflects the degree of graphitization of carbon materials The effect of dc bias voltage on the ... be the relative amount of amorphous carbon and the density of defects on the walls of the CNTs However, as subsequently shown, the high electrical resistance of CNTs grown under negative dc bias...

Ngày tải lên: 06/05/2014, 08:53

... and Thermal Conductance of Carbon Nanotube Array Interfaces,” Int J Heat Mass Transfer, 52(15–16), pp 3490–3503 [29] Tersoff, J., 1999, “Contact Resistance of Carbon Nanotubes,” Appl Phys Lett., ... Characterization of Carbon Nanotube Array Interfaces,” J Appl Phys., 101(5), p 054313 [9] Cola, B A., Xu, X., and Fisher, T S., 2007, “Increased Real Contact in Thermal Interfaces: A Carbon Nanotube/ Foil ... “Ballistic Carbon Nanotube Field-Effect Transistors,” Nature, 424(6949), pp 654–657 [22] Nemec, N., Tomanek, D., and Cuniberti, G., 2006, “Contact Dependence of Carrier Injection in Carbon Nanotubes:...

Ngày tải lên: 06/05/2014, 08:54

... response of the gas above the sample is measured and related to the thermal properties of the sample The PA phenomenon was explained by Rosencwaig and Gersho,22 and an analytic solution of the ... this study The use of the PA technique for the measurement of thermal resistance of separable ͑nonbonded͒ interfaces has not been found in the literature, nor has the use of the PA technique ... interfaces that employ carbon nanotube arrays In this work, a PA method is established to measure resistance values on the order of mm2 K / W, to validate the results of measurement techniques...

Ngày tải lên: 06/05/2014, 08:54

... and Thermal Conductance of Carbon Nanotube Array Interfaces,” Int J Heat Mass Transfer, 52(15–16), pp 3490–3503 [29] Tersoff, J., 1999, “Contact Resistance of Carbon Nanotubes,” Appl Phys Lett., ... Characterization of Carbon Nanotube Array Interfaces,” J Appl Phys., 101(5), p 054313 [9] Cola, B A., Xu, X., and Fisher, T S., 2007, “Increased Real Contact in Thermal Interfaces: A Carbon Nanotube/ Foil ... “Ballistic Carbon Nanotube Field-Effect Transistors,” Nature, 424(6949), pp 654–657 [22] Nemec, N., Tomanek, D., and Cuniberti, G., 2006, “Contact Dependence of Carrier Injection in Carbon Nanotubes:...

Ngày tải lên: 06/05/2014, 08:58

... response of the gas above the sample is measured and related to the thermal properties of the sample The PA phenomenon was explained by Rosencwaig and Gersho,22 and an analytic solution of the ... this study The use of the PA technique for the measurement of thermal resistance of separable ͑nonbonded͒ interfaces has not been found in the literature, nor has the use of the PA technique ... interfaces that employ carbon nanotube arrays In this work, a PA method is established to measure resistance values on the order of mm2 K / W, to validate the results of measurement techniques...

Ngày tải lên: 06/05/2014, 08:58

... Structure of Carbon Nanotubes Electronic Properties of Carbon Nanotubes 1.2.1 Graphene Electronic Structure 1.2.2 Carbon Nanotube ... structures that carbon The Physics of Carbon Nanotube Devices Figure 1.3 Forms of nanotubes: (a) scanning tunneling microscope image of a single wall carbon nanotube (b) A bundle of single wall nanotubes ... atomic and electronic structure of carbon nanotubes, and establish the basic nanotube properties that will be utilized in the following chapters on nanotube devices 1.1 Structure of Carbon Nanotubes...

Ngày tải lên: 04/06/2014, 14:42

... effect of fibre concentration on the alpha to beta-phase transformation, degree of crystallinity and electrical properties of vapour grown carbon nanofibre/poly(vinylidene fluoride) composites’ Carbon ... JJM: ’Modification of the surface chemistry of activated carbons’ Carbon 1999, 37:1379 Banerjee S, Hemraj-Benny T, Wong S: ’Covalent surface chemistry of single-walled carbon nanotubes’ Adv Mater ... http://www.nanoscalereslett.com/content/6/1/302 10 11 12 13 14 15 16 17 18 19 Page of Shaffer MSP, Sandler JKW: Carbon Nanotube/ Nanofibre Polymer Composites, in Processing and Properties of Nanocomposites New York: World Scientific;...

Ngày tải lên: 21/06/2014, 04:20

... compared with that of the sensor In addition, the location of attached mass can influence on the changes in frequency of the mass sensor Figure illustrates the effect of location of attached mass, ... shift of the cantilever mass sensor for e0a/ L = 0.3 It can be seen that the effect of the location of attached mass on the frequency shift of the mass sensor is significant Increasing the value of ... sensitivity of the sensor for e0a/L = 0.3 123 1778 It is important to know the sensitivity of the mass sensor The sensitivity of the sensor is defined as the ratio of the variation of the frequency...

Ngày tải lên: 21/06/2014, 07:20

... analysis of carbon nanotube bundle interconnects Kailiang Zhang*1, Bo Tian1, Xiaosong Zhu1, Fang Wang*1, and Jun Wei1,2 School of Electronics Information Engineering, Tianjin Key Laboratory of Film Electronic ... liquid theory as a model of the gigahertz electrical properties of carbon nanotubes IEEE Trans Nanotechnol 2002, 1:129-144 12 Das D, Rahaman H: Crosstalk analysis in carbon nanotube interconnects ... analysis of multiwalled carbon nanotube interconnects IEEE Trans Electron Devices 2008, 55:1328-1337 Pu SN, Yin WY, Mao JF, Liu QH: Crosstalk prediction of single- and double-walled carbon- nanotube...

Ngày tải lên: 22/06/2014, 00:20

... groups homogeneously on the side walls of SWCNTs Preparation of SWCNT@SiO2 Composite Scheme Schematic illustration of fabrication of SiO2-coated single wall carbon nanotubes (SWCNT@SiO2) and Ag nanoparticles ... reaction, 0.4 mL of ammonia water (28 wt %), lL of MPTO, and 0.1 mL of TEOS were orderly added to the reactor containing 10 mL of absolute ethanol and mg of plasma-treated SWCNTs under vigorous ... thickness of SiO2 coating is tunable by prolonging hydrolysis time of TEOS at the expense of surface smoothness Fig TEM image (a) and EDS spectrum (b) of SiO2-coated single wall carbon nanotube...

Ngày tải lên: 22/06/2014, 00:20

... assembly of randomly packed spheres can represent certain features of the geometry of simple liquids [17] Models of randomly packed hard spheres exhibited some features of the properties of simple ... form of Eq 35 is independent of the size of a small cluster attaching to a large cluster of size n Let the number of SWNTs in a small cluster be equal to ns, and the concentration of clusters of ... Nanoscale Res Lett (2007) 2:337349 of SWNTs and droplet model of single-wall carbon nanoholes (SWNHs) are proposed Computational Method Solubility of Single-wall Carbon Nanotubes A new solubility mechanism...

Ngày tải lên: 22/06/2014, 18:20

... CHARACTERIZATION OF CARBON NANOTUBE BASED DEVICES 35 2.1 Preparation of carbon nanotube solution for device fabrication 35 2.1.1 Dispersion of carbon nanotubes 35 2.1.2 Purification of carbon nanotube ... dielectrophoresis 49 2.2.2 The formation of metal and carbon nanotube contacts 51 2.2.3 Removal of metallic carbon nanotubes 54 2.3 characterization of carbon nanotube based devices 59 2.3.1 ... INVESTIGATIONS OF CARBON NANOTUBE BASED ELECTRONIC DEVICES WITH FOCUS ON METAL AND CARBON NANOTUBE CONTACTS HUANG LEIHUA (B Sci (Hons.), Fudan University) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY...

Ngày tải lên: 10/09/2015, 15:52

... on the simulations of mechanical properties of nanocrystalline copper on the basis of two reasons Firstly, there are lots of experimental data available on the mechanical deformation of nanocrystalline ... neighborhood of a crack tip during the deformation of nanocrystalline metals and alloys, which sheds light on the understanding of the damage evolution process ahead of the crack tip In the case of electrodeposited ... Chapter Modeling Methods time of observation, the origin of the coordinate system, and directions of its axes because of the homogeneity of time and space and isotropy of space in inertial coordinate...

Ngày tải lên: 30/09/2015, 14:23

... DEPOSITION 16 2.3.2.4 HIGH PRESSURE CARBON MONO-OXIDE PROCESS 17 2.3.3 ELECTRICAL PROPERTIES OF CARBON NANOTUBES 17 2.3.4 MECHANICAL PROPERTIES OF CARBON NANOTUBES 20 2.3.5 PREVIOUS WORK ON CNT ... is still no way of controlling the area of deposition, despite the large yield and fast production rate of HiPco process 2.3.3 Electrical properties of carbon nanotubes Carbon nanotubes inherit ... of nanometer scale In order to understand the properties of CNTs and hence the CNTs based systems better, it is ideal to study the CNTs and the progression of properties of CNTs synthesized under...

Ngày tải lên: 06/10/2015, 20:43

... using a mixture of phosphoric and chromic acid The SEM micrographs show several important features of the carbon nanotube arrays produced by this technique First, all of the nanotubes are parallel ... array is narrow, typically 5% of the mean diameter ͓Fig 3͑a͒, Li et al FIG Highly-ordered carbon nanotube arrays ͑a͒ SEM image showing oblique view of periodic carbon nanotube array The inset at ... enlarged view of the tubes The inset at the lower right is a histogram of the nanotube diameter showing a narrow size distribution around 47 nm ͑b͒ Top-view SEM image of the carbon nanotubes showing...

Ngày tải lên: 19/03/2014, 16:48

... as-received carbon nanotubes as DWNTas and SWNTas For SEM measurements, the carbon nanotube films were adhered on conducting tape For the electrochemistry measurements, the carbon nanotubes were ... degree of functionalization of carbon nanotubes with carboxyl groups after treating them in nitric acid at elevated temperature SEM served for imaging and comparison of morphology DW and SW nanotube ... the presence of DWNT and SWNT in the corresponding films Cyclic voltammetry was employed for estimation of capacitance of nanotube layer and for examination of electrochemical response of ferricyanide/ferrocyanide...

Ngày tải lên: 22/06/2014, 22:20

... 10) nanotubes a pseudogap of the order of 0.1 eV is predicted to open up in the density of states due to the breaking of mirror symmetry in the rope [18] Mechanical Properties of Carbon Nanotubes ... indicative of the exceptional axial stiffness of these materials More recently studies Mechanical Properties of Carbon Nanotubes 293 Fig Top panel: bright field TEM images of free-standing multi-wall carbon ... theory -simulations suggest the ability Mechanical Properties of Carbon Nanotubes 295 Fig A: bending modulus Y for MWNT as a function of diameter measured by the resonant response of the nanotube...

Ngày tải lên: 24/03/2014, 05:20