synthesis and purification of multi walled and single walled carbon nanotubes

... 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 ... characteristics of as-grown MWNT spin coated over carbon paper with and without graphitic layer (sample A and sample B) and that of purified MWNT spin coated over carbon paper with and without graphitic...

Ngày tải lên: 22/06/2014, 18:20

... 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 ... 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 ... 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...

Ngày tải lên: 22/06/2014, 01:20

... 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...

Ngày tải lên: 11/08/2014, 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...

Ngày tải lên: 21/06/2014, 08:20

... 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 ... 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 ... 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...

Ngày tải lên: 22/06/2014, 01:20

... 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...

Ngày tải lên: 11/08/2014, 00:22

... 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 their spectroscopy Nanoscale Res Lett 2009, ... 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 ... Functionalization of single -walled carbon nanotubes with well-defined polystyrene by “click” coupling J Am Chem Soc 2005, 127:14518 18 Leu CM, Chang YT, Wei KH: Synthesis and dielectric properties of polyimide...

Ngày tải lên: 21/06/2014, 05:20

... 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 ... growing carbon nanotubes 31 2.1.2 Synthesis of carbon nanotubes 31 2.2 Investigation methods 35 2.2.1 Electron microscope 35 2.2.2 Raman spectroscopy of carbon nanotubes 38 2.2.3 Xray diffraction of ... single walled carbon nanotubes (SWCNTs) and multiwalled carbon nanotubes (MWCNTs) A SWCNT is considered as a cylinder with only one wrapped graphene sheet Multi walled carbon nanotubes (MWCNTs)...

Ngày tải lên: 25/03/2015, 11:57

... 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...

Ngày tải lên: 21/06/2014, 06:20

... 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 thermal and ... 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 ... (a) (c) 31 (b) (d) Figure 4: TEM images of: a) MWCNTs-MnO2 and b) PANI/MWCNTs-MnO2, and SEM images of: c) PANI/MWCNTs and d) PANI/MWCNTs-MnO2 TEM images of the MWCNTs after being filled with MnO2...

Ngày tải lên: 07/08/2014, 14:20

... functionalization leads to enhancement of both processability and performance of the resulting composite material Many recent efforts have focused on the synthesis of CEPs with metal and metal oxides (such as ... 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...

Ngày tải lên: 05/05/2014, 15:26

... Zakhidov AA, 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 ... 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 ... positions of the main IR bands which are associated with the structure of the Fig FESEM images of wt% PPy/MWCNT composites synthesized with weight ratio of PSS/pyrrole monomer of (c) 0.1, (d) 0.3 and...

Ngày tải lên: 20/03/2014, 13:08

... 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...

Ngày tải lên: 21/06/2014, 22:20

... 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 ... °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 ... region (100–300 cm-1), two outstanding RBM bands are presented According to the formula [14], the peaks at 147 and 169 cm-1 correspond to the SWCNTs with diameter of 1.59 and 1.38 nm, respectively...

Ngày tải lên: 22/06/2014, 00:20

... (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 ... 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 ... 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...

Ngày tải lên: 22/06/2014, 18:20

... 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...

Ngày tải lên: 19/03/2014, 16:47

... 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 ... probed the variation of the Raman signal of SWCNTs at seven different positions along a bundle The TERS intensity of G-mode in carbon nanotubes is strongly dependent on the height of the bundle Moreover,...

Ngày tải lên: 21/06/2014, 05:20

... 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...

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...

Ngày tải lên: 22/06/2014, 00:20

... of single- wall carbon nanotubes with endothelial cells Nanomed 2010, 6:277-288 11 Jin H, Heller DA, Sharma R, Strano MS: Size-dependent cellular uptake and expulsion of single -walled carbon nanotubes: ... Toxicity studies of carbon nanotubes Adv Exp Med Biol 2007, 620:181-204 Kaiser JP, Wick P, Manser P, Spohn P, Bruinink A: Single walled carbon nanotubes (SWCNT) affect cell physiology and cell architecture ... heterogeneity and alignment of single wall carbon nanotubes Phys Rev B 2005, 71:- 19 Islam MF, Rojas E, Bergey DM, Johnson AT, Yodh AG: High weight fraction surfactant solubilization of single- wall carbon...

Ngày tải lên: 11/08/2014, 08:20