electronic properties of carbon nanotubes probed by magnetic measurements

... Young’s modulus of carbon nanotubes The amplitude of those oscillations was defined by means of careful TEM observations of a number of nanotubes The authors obtained an average value of 1.8 TPa for ... number of experimental measurements of the Young’s modulus of nanotubes have been reported The first such study [71] correlated the amplitude of the thermal vibrations of the free ends of anchored nanotubes ... Calculations of the elastic properties of carbon nanotubes confirm that they are extremely rigid in the axial direction (high tensile) and more readily dis- Mechanical Properties of Carbon Nanotubes...

Ngày tải lên: 24/03/2014, 05:20

... Zuppiroli L: Mechanical properties of carbon nanotubes Appl Phys A 1999, 69:255 Odom TW, Huang JL, Kim P, Lieber CM: Atomic structure and electronic properties of single-walled carbon nanotubes Nature ... RE: Single-electron transport in ropes of carbon nanotubes Science 1997, 275:1922 Ruoff RS, Lorents DC: Mechanical and thermal -properties of carbon nanotubes Carbon 1995, 33:925 Bengu E, Marks LD: ... DOS of occupied Density of States (electrons/eV) Density of States (electrons/eV) Density of States (electrons/eV) Density of States (electrons/eV) Density of States (electrons/eV) 0.6 Page of...

Ngày tải lên: 21/06/2014, 05:20

... 50% of the area is covered by CNTs and rest is covered by either catalytic nanoparticles (bright contrast) or very short nanotubes In case of sample 4, almost whole area is covered with nanotubes ... (2008) 3:25–30 two steps: (i) pretreatment of Fe film in NH3 plasma followed by (ii) introduction of C2H2 for carbon film deposition The pretreatment of Fe films had three main objectives: (i) heating ... other The maximum length of CNTs was observed to be *3 lm and the shortest nanotube observed by TEM was *500 nm The outer diameter of these nanotubes varied in the range of 30–70 nm It is to be...

Ngày tải lên: 22/06/2014, 06:20

... 50% of the area is covered by CNTs and rest is covered by either catalytic nanoparticles (bright contrast) or very short nanotubes In case of sample 4, almost whole area is covered with nanotubes ... (2008) 3:25–30 two steps: (i) pretreatment of Fe film in NH3 plasma followed by (ii) introduction of C2H2 for carbon film deposition The pretreatment of Fe films had three main objectives: (i) heating ... other The maximum length of CNTs was observed to be *3 lm and the shortest nanotube observed by TEM was *500 nm The outer diameter of these nanotubes varied in the range of 30–70 nm It is to be...

Ngày tải lên: 22/06/2014, 19:20

... formed by carbon atoms di€using into the Si NWs, CNTs could not be formed very well on the surface of nanowires because of both the volume change of the nanowires and breaking of the carbon network ... high (b1100°C), a mixture of graphitic carbon and SiC nanowires was formed because of both the carbonization of the nanowires and the fast carbon deposition to form the carbon- like structure Conclusions ... coated carbon grew to become large carbon sheets, as shown in the bottom image in Fig 4b Even the nanowires were completely carbonized and mixed into a lot of carbon sheets to form a mixture of Fig...

Ngày tải lên: 16/03/2014, 15:04

... production of 2D TMDCs with controllable layer numbers 1.1.2 Electronic, optical and vibrational properties of TMDCs Electronic structure The band structures of many TMDCs have been calculated by using ... mode of Au on MoS2 and its effect on transport properties of MoS2 FET 95 6.4 Probing the MoS2/Au interface interaction and the effect of Au deposition on the optical properties of MoS2 ... the effect of the Au/MoS2 interface formation on the electronic and electrical transport properties of MoS2 through the combination of in-situ FET characterization and in-situ UPS/XPS measurements...

Ngày tải lên: 09/09/2015, 11:16

... List of Tables Table 1.1: Magnetic properties of Alnico alloys Table 1.2: Magnetic properties of ferrites Table 1.3: Magnetic properties of Sm-Co magnets Table 1.4: Magnetic properties of NdFeB ... price per unit of available magnetic force, the wide availability of raw materials and high chemical stability Magnetic properties of ferrites arise from anisotropic properties of iron oxides ... Chapter for fabrication of magnets with very high magnetic energy density The magnetic properties of Sm-Co magnets are shown in Table 1.3 Table 1.3 Magnetic properties of Sm-Co magnets [9] Materials...

Ngày tải lên: 14/09/2015, 08:45

Ngày tải lên: 21/02/2014, 18:20

... 63 Chapter Electronic Properties of Carbon Nanotubes Probed by Magnetic Measurements M Kosaka and K Tanigaki 76 viii Chapter Optical Response of Carbon Nanotubes F Bommeli, L Degiorgi, ... of Single-Walled Carbon Nanotubes R Saito, G Dresselhaus and M S Dresselhaus 51 Chapter Behaviour of Single-Walled Carbon Nanotubes in Magnetic Fields H Ajiki and T Ando 63 Chapter Electronic ... dependence of@ e structure of EELS on the diameter and the anisotropic features of CNTs Introduction - Morphological Features of CNTs Since the discovery of carbon nanotubes (CNTs) [I], most of the...

Ngày tải lên: 05/03/2014, 17:20

... agglomerated clusters consisting of high density of nanowires The magnified view of a single cluster is depicted in the inset of Fig 2(d) These observations suggest that growth of nanowires in the present ... diffusion of Si/SiOx vapors into the metal particles, (ii) formation of liquid droplet of metal and Si/SiOx and (iii) the precipitation in the form of solid nanowires after super-saturation of liquid ... respectively, where high density of 1-D nanostructures in the form of wires having hundreds of micrometers length is clearly seen Fig 2(a) also reveals that several layers of nanowires were deposited...

Ngày tải lên: 16/03/2014, 15:18

... energy of nanowire in the supercell, lSi (lH) is the chemical potential of an Si (H) atom, nSi (nH) is the number of Si (H) atoms, and ez is the zero-point energy of Si–H vibrations The value of ... in terms of the projection of energy band in bulk Si and confinement effect: the confinement decreases the energy of HO states and increases the energy of the LU states, but the magnitude of the ... analysis of the electronic structure for stable NWs clarifies that the surface reconstruction on nanowire facets crucially affects the electronic structure Fig shows the Kohn-Sham band structure of...

Ngày tải lên: 16/03/2014, 15:37

... Multi-step purification of carbon nanotubes Carbon 2002;40(1):81–5 Ikazaki F, Ohshima S, Uchida K, Kuriki Y, Hayakawa H, Yumura M, et al Chemical purification of carbon nanotubes by use of graphite-intercalation ... changes of double-walled carbon nanotubes by heat treatment Chem Phys Lett 2004;398(1–3):87–92 Yudasaka M, Kataura H, Ichihashi T Diameter enlargement of HiPco single-wall carbon nanotubes by heat ... synthesized by the catalytic decomposition of hydrocarbons Carbon 2000;38(14):2041–5 Montoro LA, Rosolen JM A multi-step treatment to effective purification of single-walled carbon nanotubes Carbon...

Ngày tải lên: 20/03/2014, 13:06

... radiation The surface morphology of tungsten oxides thin film was examined by a fieldemission scanning electron microscope of a JEOL JSM-6700F The thickness measurements of the films studied in this ... temperature of 400 1C, the former morphology of sample C changed rimous and rough Such surface mophology of sample D could be due to the agglomerated growth of grains and the formation of good crystallinity ... result of WO3 ðtransparencyÞþ xMþ þ xeÀ 2Mx WO3 ðblueÞ The studies of cyclic voltammograms and spectrophotometric methods have shown the effects of mesoporous nanostructure on The properties of tungsten...

Ngày tải lên: 20/03/2014, 13:08

... stock solution in chloroform Preparation of P450/DDAB/EPG electrodes DDAB films were made by spreading lL of the stock solution onto a freshly polished EPG electrode The chloroform was allowed to ... conditions The rate of this electron transfer is very rapid, of the order of the rates observed in the natural donor system The redox potential of the heme did not appear to be affected by substrate ... then scans after 30 and 60 This series of scans highlights the evolution of the response over a period of h Initially, the electrode response was dominated by a well-defined reversible couple centred...

Ngày tải lên: 23/03/2014, 21:20

... spectra of CNTs grown under negative and zero dc bias voltage represent sp3 rich phases of CNTs and suggest the existence of amorphous carbon or defects on the walls of CNTs.31 The absence of a ... intensity of the G-band reflects the degree of graphitization of carbon materials The effect of dc bias voltage on the IG/ID ratio and the FWHM are presented in Figure The line shapes of the G- ... the existence of multiple G peaks The quality of the fit in the low-energy and high-energy tails of the D- and G-bands, respectively, is good The assignment of the peak components of the D- and...

Ngày tải lên: 06/05/2014, 08:53

... desirable nanotubes, and unique and novel measurement tools to characterize the chiralities of nanotubes Other chapters deal with the measurement of the electronic properties of carbon nanotubes ... also describe measurements of mechanical properties, such as the tensile loading of single-wall and multi-wall NTs, the mechanics of carbon nanocoils, and the results of pull-out tests of single ... their electronic properties, besides the well-established knowledge that individual sheets of sp2bonded carbon had extremely attractive physical and mechanical properties So, the field of carbon nanotubes...

Ngày tải lên: 04/06/2014, 14:50

... energy of singlewalled carbon nanotubes Appl Phys Lett 1999, 16:2307-2309 Peigney A, Laurent C, Flahaut E, Bacsa RR, Rousset A: Specific surface area of carbon nanotubes and bundles of carbon nanotubes ... or multiple layers of graphene sheets, of which those formed by rolling up of single sheet are called single-walled carbon nanotubes (SWCNTs) and those formed by rolling up of more than one sheets ... functionalization of the nanotubes which increases solubility and enhances other properties of interest Pseudorotaxanes are grafted along the walls of the nanotubes in a periodic fashion by wrapping of SWCNTs...

Ngày tải lên: 20/06/2014, 22:20

... single wall carbon nanotubes Carbon 2002, 40:2043-2061 24 Deng F, Zheng QS, Wang LF: Effects of anisotropy, aspect ratio, and nonstraightness of carbon nanotubes on thermal conductivity of carbon ... final properties of the system Thus, we aimed at studying the effect of two types of carbon- based nanofillers, in particular, nanotubes and graphene sheets, on the thermal conductivity of an ... effort in the transport properties of carbon nanotube [CNT] filled polymer nanocomposites [2, 3] Electrical conductivity of epoxy nanocomposites increases by several orders of magnitude with CNT...

Ngày tải lên: 20/06/2014, 23:20

... properties of carbon black nanofluids Optical properties of carbon black powder and nanofluids Rheological behaviors of carbon black nanofluids Figure shows the UV-Vis-NIR absorption spectra of carbon ... measured by the Malvern particle size analyzer are responsible for the larger particle size [21] Photothermal properties of carbon black nanofluids Measurements of thermal conductivity of carbon ... samples were also prepared by diluting the nanofluids with distilled water Measurements of photothermal properties of carbon black nanofluids The schematic diagram of photothermal property test...

Ngày tải lên: 21/06/2014, 02:20

... Catalyzing Growth of Single-Walled Carbon Nanotubes on Substrates Nano Lett 2006, 6:2987 17 Lu C, Liu J: Controlling the Diameter of Carbon Nanotubes in Chemical Vapor Deposition Method by Carbon Feeding ... Catalyzed by Defect-Rich Graphite Surfaces Chem Mater 2010 54 Reilly PTA, Whitten WB: The role of free radical condensates in the production of carbon nanotubes during the hydrocarbon CVD process Carbon ... Rümmeli MH: Tuning carbon nanotubes through poor metal addition to iron catalysts in CVD Fuller Nanotubes Carbon Nanostruct 2010, 18:703 13 Baker T: Formation of filamentous carbon Chem Ind (London)...

Ngày tải lên: 21/06/2014, 04:20