carbon nanotubes with single layer walls

... carbon nanotubes 37 C.-H KIANG, W A GODDARD 1 R BEYERS and D S BETHUNE: Carbon 1, nanotubes with single- layer walls , 47 R SETTON: Carbon nanotubes: ... the basic physics of carbon nanotubes, most of this article focuses on the symmetry properties of single layer nanotubes, with a brief discussion also provided for two -layer nanotubes and an ordered ... nanotube and enlarged one (inserted), without deposited carbon Fig Coexisting vapour-grown carbon fiber, with thicker diameter and hollow core, and carbon nanotubes, with thinner hollow core, (as-grown...

Ngày tải lên: 05/03/2014, 15:21

... carbon nanotubes 37 C.-H KIANG, W A GODDARD 1 R BEYERS and D S BETHUNE: Carbon 1, nanotubes with single- layer walls , 47 R SETTON: Carbon nanotubes: ... the basic physics of carbon nanotubes, most of this article focuses on the symmetry properties of single layer nanotubes, with a brief discussion also provided for two -layer nanotubes and an ordered ... nanotube and enlarged one (inserted), without deposited carbon Fig Coexisting vapour-grown carbon fiber, with thicker diameter and hollow core, and carbon nanotubes, with thinner hollow core, (as-grown...

Ngày tải lên: 27/06/2014, 17:20

... carbon nanotubes 37 C.-H KIANG, W A GODDARD 1 R BEYERS and D S BETHUNE: Carbon 1, nanotubes with single- layer walls , 47 R SETTON: Carbon nanotubes: ... the basic physics of carbon nanotubes, most of this article focuses on the symmetry properties of single layer nanotubes, with a brief discussion also provided for two -layer nanotubes and an ordered ... nanotube and enlarged one (inserted), without deposited carbon Fig Coexisting vapour-grown carbon fiber, with thicker diameter and hollow core, and carbon nanotubes, with thinner hollow core, (as-grown...

Ngày tải lên: 27/06/2014, 17:20

... multi-walled carbon nanotubes, and application to surface acoustic wave quartz crystal gas sensor, Mat Chem Phys 109 (2008) 148–155 [10] M.K Kumar, A.L.M Reddy, S Ramaprabhu, Exfoliated single- walled carbon ... particles) with titania acting as a buffer layer to avoid further MWCNTs de-doping For screen-printed TiO2 /MWCNT films, the sensing mechanism seems to be determined by the strong interaction of NH3 with ... given its poor intimate contact with titania particles Previous theoretical work with acetone adsorption [21], and current experimental and theoretical calculations with titania films annealed at...

Ngày tải lên: 20/03/2014, 13:07

... the multilayers are “twisted” (turbostratic stacking) (c) 50 × 50 nm2 STM images of a bilayer and a monolayer The turbostratic stacking of the bilayer is revealed by a long-range MP with a wavelength ... correspond to monolayer graphene grown on (3 × 3) SiC-reconstructed surface MPs are seen on the monolayer and on the multilayers (the brighter area) indicating that the first graphene layer is disoriented ... V) with a current of 0.2 nA With such high voltage, only the (3 × 3) SiC surface can be imaged on the bare SiC and through the monolayer One can still distinguish that the edges of the monolayer...

Ngày tải lên: 21/06/2014, 05:20

... conductivity of zigzag singlewalled carbon nanotubes: role of the umklapp process Phys Rev B 2004, 69:47 26 Gu Y, Chen Y: Thermal conductivities of single- walled carbon nanotubes calculated from ... dynamics of singlewalled carbon nanotubes Phys Rev B 2003, 67:045413 33 Esfarjani K, Zebarjadi M, Kawazoe Y: Thermoelectric properties of a nanocontact made of two-capped single- wall carbon nanotubes ... production of single- walled carbon nanotubes by the electric-arc technique Nature 1997, 388:756-758 40 Kong J, Soh HT, Cassell AM, Quate CF, Dai H: Synthesis of individual singlewalled carbon nanotubes...

Ngày tải lên: 21/06/2014, 17:20

... be found Single- walled and multi-walled carbon nanotubes CNTs as single- walled carbon nanotubes (SWNTs) or multi-walled carbon nanotubes (MWNTs) As the names imply, SWNT consists of a single CNT ... Zigzag, armchair and chiral carbon nanotubes CNTs are also categorized as chiral or achiral carbon nanotubes The latter comprises of both zigzag and armchair carbon nanotubes This categorization ... CNTs Carbon nanotube which has remarkable mechanical, electrical and thermal properties was first discovered by Sumio Iijima (1991) Carbon nanotube (CNT) is basically a cylinder with a single layer...

Ngày tải lên: 09/09/2015, 18:54

... Background 1.2 Carbon Nanotubes 1.2.1 Discovery of Carbon Nanotubes 1.2.2 Bonding Structures of Carbon Nanotubes 1.2.3 Properties of Carbon Nanotubes 1.2.4 Applications of Carbon Nanotubes 2 13 ... Nanotubes 4.3.2 Catalytic Growth Mechanism of Carbon Nanotubes 4.3.3 Function of Metal Catalyst in CNT Growth 4.3.4 Growth Rate of Carbon Nanotubes with Fe Catalyst 56 56 60 62 66 4.4 Summary 68 ... CNT surface with appropriate semiconductor materials, such as certain metal oxide and diamond-like carbon ultrathin films This chapter will start with an overview of CNTs 1.2 Carbon Nanotubes In...

Ngày tải lên: 11/09/2015, 10:17

... [24] The FE cold cathode can be fabricated with multilayer semiconductor thin film structures as well and these films can be produced thinner than 10 nm with the sophisticated technology [25, 26] ... showed that with varied anode-cathode distances, the threshold voltage shifted accordingly [35, 36] With the increase of anode-cathode spacing, the threshold voltage increased as well With the further ... Deposited with ultrathin films, the FE cathode can be dramatically modified in the electronic structures hence leading to significantly promoted FE characteristics [27] By utilizing multilayer ultrathin...

Ngày tải lên: 11/09/2015, 10:17

... more carbon atoms of an organic hydrocarbon group When the metal-organic gas molecules pass over a hot substrate, the heat breaks up the molecules and deposits the desired atoms on the surface layer ... worldwidely to grow various materials, including carbon and carbon related materials (diamond, nanocrystalline diamond and CNTs, etc.) and non -carbon advanced materials, such as GaN, SiC, Ga2O3 ... electrons colliding with gas atoms and molecules, high ionization fractions are generated and the inlet gases (carbon containing gases or hydrogen gas) are then dissociated within such a discharge...

Ngày tải lên: 11/09/2015, 10:17

... different process with the arc discharge and laser vaporization methods Instead of beginning with a solid carbon, the carbon atoms are extracted from a carbon monoxide or hydrocarbon gas, which ... bamboo-knot carbon layer at the carbon wall-catalyst junction; (c) subsequent growth of bamboo-like compartment in the hollow center of the CNT 59    Chapter Synthesis of Vertically-Aligned Carbon Nanotubes ... play a similar role   65    Chapter Synthesis of Vertically-Aligned Carbon Nanotubes 4.3.4 Growth Rate of Carbon Nanotubes with Fe Catalyst In order to investigate the growth rate of CNTs under...

Ngày tải lên: 11/09/2015, 10:18

... Hydrogenated Tetrahedral Amorphous Carbon Coated Carbon Nanotubes Core-Shell Nanostructures neighbors giving rise to three-dimensional interconnected structure of carbon atoms [1] This structure ... temperature, an amorphous carbon film can be produced in which a proportion of the carbon atoms are bonded as in diamond This amorphous carbon is called diamond-like carbon (DLC) DLC resembles ... Hydrogenated Tetrahedral Amorphous Carbon Coated Carbon Nanotubes Core-Shell Nanostructures The laser system used was a class Compex Lambda Physik pulsed laser excimer laser with a wavelength of 248 nm...

Ngày tải lên: 11/09/2015, 10:18

... Chapter Field Emission Study of Hydrogenated Tetrahedral Amorphous Carbon Coated Carbon Nanotubes Core-Shell Nanostructures with the increase of ambient temperature during emission process, the ... cross-sectional view it is obvious that without hydrogenation treatment, the CNT tips are wrapped with thin films, which look like a layer of whiskers formed with the average diameter larger than ... and the average diameter of these nanotubes is comparable to that 136 Chapter Field Emission Study of Hydrogenated Tetrahedral Amorphous Carbon Coated Carbon Nanotubes Core-Shell Nanostructures...

Ngày tải lên: 11/09/2015, 10:18

... Emission Study of Hydrogenated Tetrahedral Amorphous Carbon Coated Carbon Nanotubes Core-Shell Nanostructures References M Meyyappan, Carbon Nanotubes: Science and Applications (CRC press, 2005) ... water layer in air and result in a raised valence band maximum of diamond, in other words, a 143 Chapter Field Emission Study of Hydrogenated Tetrahedral Amorphous Carbon Coated Carbon Nanotubes ... enhancement of the hydrogenated triple layered nanocomposite specimen 144 Chapter Field Emission Study of Hydrogenated Tetrahedral Amorphous Carbon Coated Carbon Nanotubes Core-Shell Nanostructures...

Ngày tải lên: 11/09/2015, 10:18

... papers with main contribution J Yu, Y M Foong, A T T Koh, and Daniel H C Chua “Hydrogenation and its effects on the field emission characteristics of tetrahedral amorphous carbon coated carbon nanotubes ... amorphous carbon films containing nano-graphene clusters” Submitted to Applied Physics Letters H Y Wang, Z Tan, J Yu, and Daniel H C Chua “Enhancement of field emission by coating carbon nanotubes with ... Daniel H C Chua “Enhanced field emission properties of hydrogenated tetrahedral amorphous carbon/ carbon nanotubes nanostructures” Electrochemical and Solid-State Letters 13, K80 (2010) (selected...

Ngày tải lên: 11/09/2015, 10:18

... isolated 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 ... platelet-like carbon- based nanostructures Comparing the experimental results with the theoretical model, an anomalous enhancement was obtained with multiwall carbon nanotubes, probably due to their layered ... Phonon modes in single- wall nanotubes with a small diameter Physica B 1999, 263-264:479-481 20 Popov VN: Theoretical evidence T1/2 specific behavior in carbon nanotube systems Carbon 2004, 42:991-995...

Ngày tải lên: 20/06/2014, 23:20

... of ¨ carbon, Nature 347, 354 (1990) [10] D.S Bethune, C.H Klang, M.S de Vries, G Gorman, R Savoy, J Vazquez and R Beyers, Cobaltcatalysed growth of carbon nanotubes with single- atomic -layer walls, ... Saito Fig Carbon nanotubes There are two kinds of achiral nanotubes called ‘‘zigzag nanotubes ’ (left) and ‘‘armchair nanotubes ’ (center) The remaining nanotubes are called ‘‘chiral nanotubes ’ ... phases of nanotubes, i.e., bundles of single- walled carbon nanotubes and concentric multiwalled carbon nanotubes, are very important phases to be discussed In these condensed phases of nanotubes, ...

Ngày tải lên: 04/06/2014, 14:43

... 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 ... where molecules with pyrene groups were allowed to react with amines The patterned assembly of a single layer of SWCNT could be achieved through π-π stacking with the area covered with pyrenyl groups ... of single- wall carbon nanotubes through C-N bond forming substitutions of fluoronanotubes-Patent 2006, US2006171874 Ford WE, Wessels J, Yasuda A: Method and apparatus for producing carbon nanotubes- Patent...

Ngày tải lên: 20/06/2014, 22:20

... and functionalization of closely related carbon materials such as vapor-grown multi-walled carbon nanofibers (MWCNFs) [12, 13] and multi-walled carbon nanotubes (MWCNTs) [14–18] In this work, ... following the procedure described in a literature and its melting point was 236–238 °C [19] Single- walled carbon nanotubes (SWCNTs, 30–40 wt% 767 purity) were obtained from Hanwha Nanotech Co., LTD, ... 2920 Results and Discussion Without purification, most of the as-prepared SWCNTs contain approximately 60–70 wt% of impurities such as carbonaceous fragments, amorphous carbons, and small amount...

Ngày tải lên: 22/06/2014, 00:20