synthesis diagnostics and control of single walled carbon nanotubes and nanohorns for composites and biological nanovectors

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 ... temperature, more and more amorphous carbons are formed, and when the growth temperature increases to 950 °C, only a few SWCNTs are shown in the results and are coated by plenty of amorphous carbons Conclusions ... SWCNTs are formed, and when the temperature is higher than 950 °C, more and more amorphous carbons are formed in the SWCNTs bundles due to the self-decomposition of CH4 The temperature window of SWCNTs...

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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 ... tip and the Figure TERS (red) and confocal Raman (blue) spectra of the G-mode at seven positions along an SWCNT bundle The gray and light gray peaks represent the Lorentzian fits for the TERS and...

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

Ngày tải lên : 19/03/2014, 16:47

... device, MEMS (Bio and RF), and carbon nanotube-based nano systems Prof Ju is a member of the Society for Information Display (SID), the Korea Institute of Electrical Engineering (KIEE), and the Korea ... 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 ... 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: " 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 ... efficient medium for covalent attachment of TMPBA onto SWCNTs Conclusions The purification of SWCNTs and the covalent attachment of TMPBA onto the surface of SWCNTs were conducted in a mild and thus less...

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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 ... 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 ... micrometer controlled translational stage and in the case of samples A and B the distance was held at 400 lm and for samples B and D, the separation was 500 lm A DC power source was used for sourcing...

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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

... (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 ... 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...

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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

... bonding in this case Therefore, even with the addition of 20 vol.% H2 (H2/O2 of 10/40 (sccm/sccm)) in gas, there is still a signiﬁcant removal of amorphous carbon and formation of oxygen-containing ... 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 ... of amorphous carbon is minimized Note that the amount of surface defects is important for functional groups to form on the nanotube surface [10] In order to evaluate the formation of defects on...

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Báo cáo hóa học: " Symmetry Properties of Single-Walled BC2N Nanotubes" pdf

Ngày tải lên : 22/06/2014, 01:20

... modes are 19 and 10, respectively, for AC-1 BC2N nanotubes in irrespective of n The numbers of Raman- and IR- active phonon modes for ZZ-1 BC2N nanotubes are almost twice as for AC-1 BC2N nanotubes, ... common divisor of 2n þ m and 2m þ n ; d is 0 the greatest common divisor of n and m ; SN/d and SN are the screw-axis operations with the orders of N/d and N, respectively The point group of the line ... BC2N nanotubes were discussed based on line group All BC2N nanotubes possess nonsymmorphic line groups, just like carbon nanotubes [8] and boron nitride nanotubes [11] Contrary to carbon and boron...

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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 ... 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 ... Nanobiotechnology Program – Effects of carbon nanotubes under biological systems) and the personal fellowships for LMH, HJC Thanks for the English revision to Júlia N Varela and Maria Cecília T Amstalden...

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Effect of multi walled carbon nanotubes loaded with ag nanoparticles on the

Ngày tải lên : 01/12/2016, 16:32

... radius of MWNTs is between and 10 nm and the Ag NPs deposit on the MWNTs For the Ag/MWNTs- P (Fig 1a), the size of Ag NPs is smaller (ca nm), some of them could enter the cavities of MWNTs and deposit ... Templated synthesis of single- walled carbon nanotube and metal nanoparticle assemblies in solution, J Am Chem Soc 128 (2006) 15078–15079 [31] V Lordi, N Yao, J Wei, Method for supporting platinum on single- walled ... attraction of negatively charged silver and positively charged cationic radical of RhB So the presence of optimal content of Ag NPs, here is 3.0 wt%, can reduce the possibility of excitons quenching and...

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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

... 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 ... 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 ... thickness was controlled by the numbers of the ALD cycles A typical deposition consists of 80 cycles For ALD of alumina (AlxOy), trimethylaluminum [Al(CH3)3] and water were used as aluminum and oxygen...

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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

... (G band) [22] The D band is attributed to a disordered graphite structure or sp -hybridized carbons of the nanotubes, whereas the G band corresponds to a splitting of the E g stretching mode of ... 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, ... 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...

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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

... 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 nanocomposite ... 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 ... P-MWNT/ nylon-6 were dissolved in formic acid [37] The solutions of the composites were sonicated in formic acid for h in order to accelerate homogeneous dispersion of the MWNTs The prepared solutions...

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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

... 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 ... Laboratories for Materials Science and Technology, Laboratory for Materials Biology Interactions, St Gallen, Switzerland 2Institute of Anatomy, Division of Histology, University of Bern, Bern, Switzerland ... 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...

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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 ... modulus and tensile strength combined with the low weight and fiber-like form make nanotubes enticing candidates for composite 26 reinforcement Composites of nanotubes are based on dispersing nanotubes ... 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...

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Báo cáo hóa học: " Size and temperature effects on the viscosity of water inside carbon nanotubes" pptx

Ngày tải lên : 21/06/2014, 06:20

... nanoflows and is instructive for understanding the coupling effect of the size and the temperature at the nanoscale Abbreviations LJ: Lennard-Jones; MD: molecular dynamics; SWCNTs: single- walled ... Science and Technology, Jiangsu University, Zhenjiang 212013, China Authors contributions HZ and HY conceived and designed this work HY and ZZ performed the MD simulations HY, YZ and ZZ collected and ... Hydrophobic Channel of a Carbon Nanotube Nature 2001, 414:188 Holt JK: Carbon Nanotubes and Nanofluidic Transport Adv Mater 2009, 21:3542 Hanaski I, Yonebayashi T, Kawano S: Molecular dynamics of a water...

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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 ... curves evidence that the maxima and minima of the conductance appear at the same voltages for both temperatures, namely, 15 and 25 mV for the maxima and 20 and 30 mV for the minima on both polarities ... was further performed to remove totally the silicon nitride and the nanotubes at one end of the sample, for exposing the bottom electrode Finally, the top electrode of 10 nm Cr and μm Al layers...

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Báo cáo hóa học: " Record Endurance for Single-Walled Carbon Nanotube–Based Memory Cell" pot

Ngày tải lên : 21/06/2014, 08:20

... SWCNT bandgap and can be enhanced by selecting a semiconducting SWCNT with smaller diameter and large bandgap In our previous work [15, 17], we obtained devices with low contact resistance and large ... and large ON/OFF ratio, with the same fabrication process used for the samples discussed here Because we use nanotubes with a small bandgap, we can test memory device properties for the same ... very different values of ON/OFF ratio, i.e smaller ON/OFF ratio at room temperature or larger ON/OFF ratio at low temperature Indeed, at low temperature (red circles), the ON/OFF ratio increases...

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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

... 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 ... stability and reversible control of conductivity both by charge-transfer doping and protonation.8 The use of PANI together with CNTs to form nanocomposites could result in the formation of ternary ... 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...

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báo cáo khoa học: "Single-walled carbon nanotube interactions with HeLa cells" doc

Ngày tải lên : 11/08/2014, 00:22

... Bioelectrochemical single- walled carbon nanotubes Journal of the American Chemical Society 2002, 124:12664-12665 Lin Y, Allard LF, Sun YP: Protein-Affinity of Single- Walled Carbon Nanotubes in Water Journal of ... on isolated single wall carbon nanotubes Carbon 2002, 40:2043-2061 Resasco DE, Herrera JE: Structural characterization of singlewalled carbon nanotubes Encyclopedia of Nanoscience and Nanotechnology ... chemistry of single- wall carbon nanotubes Journal of Materials Chemistry 2002, 12:1952-1958 Banerjee S, Hemraj-Benny T, Wong SS: Covalent surface chemistry of single- walled carbon nanotubes Advanced...

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