structure of multi walled and single walled carbon nanotubes eels study

Báo cáo hóa học: " Effect of Purity and Substrate on Field Emission Properties of Multi-walled Carbon Nanotubes" pdf

Ngày tải lên : 22/06/2014, 18:20

... purity of the MWNT and the presence of the graphitized layer between the nanotubes and carbon paper in Sample C The absence of the graphitized layer between the MWNT and carbon paper in samples B and ... graphitized carbon paper is a double layer structured gas diffusion layer porous carbon paper which consists of a macroporous layer of carbon ﬁber paper (SGL, Germany) and a microporous layer of carbon ... ambient air and scanning in the 2h range of 10–90°, in steps of 0.05° X-ray diffraction pattern of DyNi2 alloy shows the formation of single phase with a C 15 type cubic structure XRD pattern of as-prepared...

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Báo cáo hóa học: " Effects of Gas Composition on Highly Efﬁcient Surface Modiﬁcation of Multi-Walled Carbon Nanotubes by Cation Treatment" pptx

Ngày tải lên : 22/06/2014, 01:20

... functionalize multi- walled carbon nanotubes (MWCNTs) with minor negative consequences in nanotube structure [24] In the process, high incident energy hydrogen and oxygen cations generated and extracted ... presence of carbon and oxygen on the treated and untreated samples are normalized with respect 123 236 Nanoscale Res Lett (2009) 4:234–239 Fig a SEM and b TEM images of the pristine MWCNTs, c SEM, and ... disordered materials, poor graphitization, functionalized carbon, and the amorphous carbon on the sidewall of nanotubes [28–30] The G band at frequencies around 1,572 cm-1 is activated by the...

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Báo cáo khoa hoc:" Effects of multi-walled carbon nanotubes (MWCNT) under Neisseria meningitidis transformation process" pps

Ngày tải lên : 11/08/2014, 08:20

... action of MWCNT in the transformation of serogroup C N meningitidis against two different DNA obtained from isogenic mutants of this microorganism Methods Synthesis of multi- walled carbon nanotubes ... Y and W135 are the most frequently found in invasive infections The capsule of serogroups B, C, Y and W135 strains is composed of either homopolymers (B and C) or heteropolymers (Y and W135) of ... amounts of DNA(1µg) from M2 and M6 mutants, MWCNT (20 µg) and bacterial cells were submitted to action 5U of DNase (New England Biolabs, UK) and further transformation process Also, the counts of...

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Báo cáo hóa học: " Atomic Layer Deposition of ZnO on Multi-walled Carbon Nanotubes and Its Use for Synthesis of CNT–ZnO " doc

Ngày tải lên : 21/06/2014, 08:20

... Raman spectrum of our PECVD MWCNTs (Fig curve a) shows a strong D band, indicating the existence of defects on the tube wall Compared to MWCNTs, the surfaces of the single -walled carbon nanotubes ... of PECVD-grown CNTs b TEM image of ALD ZnO-coated CNTs c and d SEM images of ALD ZnO-coated CNTs e TEM image of ALD AlxOy-coated CNTs Fig Raman spectrum of CNTs before (a) and after (b) ALD of ... morphology of the PECVD CNTs prior to deposition Most of the nanotubes are multiwall tubes, and the average diameter of the CNTs is about nm Figure 1b shows the typical TEM image of ALD ZnO-coated...

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Báo cáo hóa học: " In situ Polymerization of Multi-Walled Carbon Nanotube/Nylon-6 Nanocomposites and Their Electrospun Nanoﬁbers" pot

Ngày tải lên : 22/06/2014, 01:20

... MWNTs, and studied the effect of collector speed on the morphologies of the nanofibers and the crystal structures of the nylon-6 In the present study, we employed the aromatic amine functionalized multi- walled ... elongational flow [47] The reflections at 2h = 11 and 21° are -201/200/001 and 020 of the c form, respectively, and the reflections at 2h = *20 and 23° are 200 and 002 of the a form, respectively [47] The ... the aromatic amine functionalized multi- walled nanotubes (F-MWNTs) and an in situ polymerization method for the preparation of welldispersed nanocomposites and nanofibers The F-MWNT was functionalized...

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báo cáo khoa học: "The adsorption of biomolecules to multi-walled carbon nanotubes is influenced by both pulmonary surfactant lipids and surface chemistry" doc

Ngày tải lên : 11/08/2014, 00:22

... design Page of of the study and made substantial contributions to the analysis and interpretation of the data HFK and PG made substantial contributions to the analysis and interpretation of the data ... Department of Paediatrics, Inselspital and University of Bern, Bern, Switzerland 4Department of Chemical Biology and Therapeutics, St Jude Children’s Research Hospital, Memphis, TN 38105, USA and School ... Interaction, Empa, St Gallen, Switzerland and Sandra Frank from the Institute of Anatomy, University of Bern, Bern, Switzerland We also acknowledge Kirsten Clift for proofreading the manuscript This...

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Báo cáo hóa học: " Synthesis of multi-walled carbon nanotube/ polyhedral oligomeric silsesquioxane nanohybrid by utilizing click chemistry" pptx

Ngày tải lên : 21/06/2014, 05:20

... functionalized carbon nanotubes Prog Polym Sci 2010, 35:837 14 Jin J, Dong Z, He J, Li R, Ma J: Synthesis of novel porphyrin and its complexes covalently linked to multi- walled carbon nanotubes and study of ... MWNTs-alkyne, and the MWNT-POSS nanohybrid have two characteristic bands at 1352 cm -1 (D band) and 1585 cm -1 (G band) [22] The D band is attributed to a disordered graphite structure or sp -hybridized carbons ... copolymer brushes on multiwalled carbon nanotubes Macromolecules 2009, 42:5416 doi:10.1186/1556-276X-6-122 Cite this article as: Yadav et al.: Synthesis of multi- walled carbon nanotube/polyhedral...

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Báo cáo hóa học: " Electrical behavior of multi-walled carbon nanotube network embedded in amorphous silicon nitride" potx

Ngày tải lên : 21/06/2014, 06:20

... minima Abbreviations CNTs: carbon nanotubes; MWCNTs: multi- walled carbon nanotubes; PMMA: poly(methyl methacrylate); SWCNTs: single -walled carbon nanotubes; THF: tetrahydrofuran; XTEM: cross-sectional ... conductance of multiwall carbon nanotubes Phys Rev B 2002, 66:073407, (1-4) Abrikosov AA Jr, Livanov DV, Varlamov AA: Electronic spectrum and tunneling properties of multiwall carbon nanotubes ... Theory of temperature dependence of the conductivity in carbon nanotubes J Appl Phys 2010, 107:013711, (1-4) Li HJ, Lu WG, Li JJ, Bai XD, Gu CZ: Multichannel ballistic transport in multiwall carbon...

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Báo cáo vật lý: "Polymerisation of Protonic Polyaniline/Multi-Walled Carbon Nanotubes-Manganese Dioxide Nanocomposites" doc

Ngày tải lên : 07/08/2014, 14:20

... Atomic structure and electronic properties of single -walled carbon nanotubes Nature, 391(6662), 62–64 Santos, C.V., Hernandez, A.L.M., Fisher, F.T., Ruoff, R & Castano, V.M (2003) Improvement of ... oxidation state of emaraldine salt of PANI.15 The strong band around 1141 cm–1 is the characteristic peak of PANI conductivity and is a measure of the degree of the delocalisation of electrons.14 ... (2006) Multi- walled carbon nanotubes coated with polyaniline Polymer, 47(16), 5715–5723 Peng, C., Jin, J & Chen, G.Z (2007) A comparative study on electrochemical co-deposition and capacitance of...

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High yield synthesis of multi-walled carbon nanotubed from CaCO3 supported iron (III) nitrate catalyst

Ngày tải lên : 25/03/2015, 11:57

... Abbreviations Preface and target of the work Chapter Introduction to carbon nanotubes material 1.1 Brief history of carbon canotubes 1.2 Geometry of carbon nanotubes 1.3 Syntheses of carbon canotubes ... л-electrons of carbon atoms The two-dimensional graphite electronic structure is considered as the origin of that of single- wall carbon nanotube A simple approximation of the л and л*-band electronic structure ... set of concentric SWNTs The structure of a single walled carbon nanotube is explained in terms of its 1D unit cell, defined by the vectors Ch and T in Fig 1.2a [20] The circumference of any carbon...

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conducting polymer functionalized multi walled carbon nanotubes with

Ngày tải lên : 05/05/2014, 15:26

... Research on the precise control of synthesis of composite nano-structures has become increasingly important as the functionality, processability, size, and morphology of nano-structures play a crucial ... doping/dedoping nature, and its potential use in a large variety of applications [27,28] Notwithstanding, the conductivity and current carrying capacity of PANI are lower compared to those of most metals; ... method [33] Results and discussion 3.1 Morphology and formation of the MWCNTs-f-PANI/Au or Ag nanocomposites The morphology and size of the as-oxidized MWCNTs, MWCNTsf-PANI and MWCNTs-PANI/Au...

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synthesis and characterization of conductive polypyrrole multi-walled carbon

Ngày tải lên : 20/03/2014, 13:08

... de Heer WA Carbon nanotubes – the route toward applications Science 2002;297:787–92 [6] Dai L, Mau AWH Controlled synthesis of modiﬁcation of carbon nanotubes and C60: carbon nanostructures for ... Ichihashi T Single- shell carbon nanotubes of l nm diameter Nature 1993;363:603–5 [2] Fan S, Chapline MG, Franklin NR, Tombler TW Self-oriented regular arrays of carbon nanotubes and their ﬁeld ... conductivities and these results may be due to the decrease in the thickness of PPy with the presence of high content of PSS In order to understand the role of PSS during the formation of PPy/MWCNT...

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Báo cáo hóa học: " Synthesis and Characterization of Magnetic Metal-encapsulated Multi-walled Carbon Nanobeads" doc

Ngày tải lên : 21/06/2014, 22:20

... easy and large-scale production of CNTs and metal-ﬁlled CNTs We have already developed a single- step technique for the synthesis of single -walled carbon nanotubes (SWNTs), multi- walled carbon nanotubes ... Figure 2a–c shows the SEM, TEM and HRTEM images of Ni-ﬁlled multi- walled carbon nanotubes obtained at 950 °C Figure 2c shows the uniform encapsulation of Ni (Fig 2d) single crystalline MWNT Further, ... graphitic layers of nanotubes and a slight weight gain at 850 °C of Ni-encapsulated MWNB may be due to the formation of higher oxides of metal after complete burning of graphitic layers of MWNT The...

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development of an ozone gas sensor using single - walled carbon nanotubes

Ngày tải lên : 19/03/2014, 16:47

... Eriksson, Effect of ozone oxidation on single -walled carbon nanotubes, J Phys Chem B 110 (2006) 7113–7118 J Li, Y Lu, Q Ye, M Cinke, J Han, M Meyyappan, Carbon nanotube sensors for gas and organic ... E.C Dickey, P.C Eklund, Debundling and dissolution of single -walled carbon nanotubes in amide solvents, J Am Chem Soc 126 (2004) 6095–6105 N Sano, F Ohtsuki, Carbon nanohorn sensor to detect ozone ... 65 (2007) 263–268 W.L Yim, J.F Liu, A reexamination of the chemisorption and desorption of ozone on the exterior of a (5,5) single -walled carbon nanotube, Chem Phys Lett 398 (2004) 297–303 N.I...

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Báo cáo hóa học: " Studying the local character of Raman features of single-walled carbon nanotubes along a bundle using TERS" potx

Ngày tải lên : 21/06/2014, 05:20

... spectroscopy applied to single -walled carbon nanotubes Chem Phys Lett 2005, 410:136 Hartschuh A, Qian H, Meixner AJ, Anderson AJ, Novotny L: Nanoscale optical imaging of single -walled carbon nanotubes J ... AJ, Anderson N, Novotny L: Nanoscale Optical Imaging of Excitons in Single -Walled Carbon Nanotubes Nano Lett 2005, 5:2310 11 Roy D, Williams C: High resolution Raman imaging of single wall carbon ... positions (3) and (4), in accordance with the corresponding height profiles (Table 1) of the nanostructure (A) (Figure 1) At positions (1), (5), (2), and (6) the heights of the nanostructure are...

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Báo cáo hóa học: " Developing the dielectric mechanisms of polyetherimide/multi-walled carbon " pot

Ngày tải lên : 22/06/2014, 00:20

... 155:G169-G172 10 Ausman KD, Piner R, Lourie O, Ruoff RS, Korobov M: Organic solvent dispersions of single -walled carbon nanotubes: toward solutions of pristine nanotubes J Phys Chem 2000, B104:8911-8915 ... interactions between the carboxyl and hydroxyl groups of the MWNTs, and the N and O of the PEI molecules [11] Figure plots the measured and predicted dielectric properties of the PEI/MWNT composites ... Preparation and properties of the polyimide /multi- walled carbon nanotubes (MWNTs) nanocomposites Comp Sci Tech 2006, 66:548-554 Yang CF, Wu CC, Chen YC, Su CC: The dielectric properties of PEI/(Ba0.8Sr0.2)(Ti0.9Zr0.1)O3...

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Báo cáo hóa học: " A Temperature Window for the Synthesis of Single-Walled Carbon Nanotubes by Catalytic Chemical Vapor Deposition of CH4 over Mo2-Fe10/MgO Catalyst" pptx

Ngày tải lên : 22/06/2014, 00:20

... which represent the existence of SWCNTs are hardly shown The data show no SWCNTs are formed and there are only poorly multi- walled carbon nanotubes (MWCNTs) and organized carbon in the sample The ... coated by more and more amorphous carbons, and when the temperature increases to 950 °C, SWCNTs are hardly observed In order to study the inﬂuence of growth temperature on the purity of prepared ... °C, more and more amorphous carbons are formed in the SWCNTs bundles due to the self-decomposition of CH4 The temperature window of SWCNTs efﬁciently growth is between 800 and 950 °C, and the...

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Báo cáo hóa học: " Grafting of 4-(2,4,6-Trimethylphenoxy)benzoyl onto Single-Walled Carbon Nanotubes in Poly(phosphoric acid) via Amide Function" pot

Ngày tải lên : 22/06/2014, 00:20

... polymerization of phenoxybenzoic acids [11] and functionalization of closely related carbon materials such as vapor-grown multi- walled carbon nanoﬁbers (MWCNFs) [12, 13] and multi- walled carbon nanotubes ... 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 of graphite ... implies the higher purity of SWCNTs The TEM image of the as-received SWCNTs shows that there are large portions of carbonaceous and metallic impurities (Fig 1c) On the other hand, the PPA treated...

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Báo cáo hóa học: " Boron and Nitrogen Doped Single walled Carbon Nanotubes as Possible Dilute Magnetic Semiconductors" doc

Ngày tải lên : 22/06/2014, 18:20

... walled carbon nanotube (b) optimized structure of zig-zag C68B2 single walled carbon nanotube Methods and Results The structures at minimum energy of zig-zag (7,0) and armchair (5,5) tubes are obtained ... energy between the singlet and doublet states The + sign means the triplet state has lower energy than the singlet state Fig (a) Optimized structure of C68B2 armchair single walled carbon nanotube ... (2007) 2:447–449 Table Calculated total energy of singlet and triplet state for boron and nitrogen doped single wall zig-zag and armchair carbon nanotubes Formula Type C68B2 Armchair Method Total...

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Báo cáo hóa học: " Multi-Stable Conductance States in Metallic Double-Walled Carbon Nanotubes" ppt

Ngày tải lên : 22/06/2014, 01:20

... the VG and thermal activation The two-dimensional dI/dV plot as a function of VD and VG for the sample No (Fig 3c) indicates that the positions of the dI/dV dips and peaks evolve smoothly and periodically ... their inner and outer tubes under the equilibrium of the van der Waals interaction between layers with the elastic force of the graphene layers, which can affect the electronic structures of DWCNTs ... peaks and dips of dI/dV curve come 123 542 Fig a Two-dimensional dI/dV plot as a function of VD and VG measured at 5.0 K for a metallic DWCNT b The dI/dV–VD curves around the distinct boundary of...

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