Growth of carbon nanotubes over nonmetallic based catalysts

... of carbon at high temperatures Generally, for supported metal catalysts, there are two proposed mechanisms for the growth of CNTs, namely tip -growth and base -growth model, both of which are based ... sought for the proper understanding of CNT growth over non-metallic catalysts As oppose to metallic catalysts, the synthesis of CNTs over the nonmetallic catalyst...

Ngày tải lên: 08/10/2015, 23:11

... typical flow rates of Ar, H2, C2H4, and CO2 were 250, 200, 100, and 50 sccm, respectively After a 1-h growth of aligned CNTs, the feedstock of C2H4 and CO2 The catalyst layers deposited by ALD process ... preparations of uniform catalyst layers through PVD process on non-planar surfaces, the synthesis of uniform aligned CNTs on all surface of substrate was only achieved...

Ngày tải lên: 21/06/2014, 17:20

... in the controlled fabrication and assembly motivate the author to explore large-scale fabrication of carbon nanotube based structures with controlled parameters and assembly of carbon nanotubes ... Chapter Three – Fabrication of Carbon Nanotubes by CVD process 3.1 Objective The objective of the whole project is to explore controlled fabrication and...

Ngày tải lên: 03/10/2015, 21:57

... this planning the present monograph is entitled "The Science and Technology of Carbon Nanotubes" as the successive version of ref for the benefit of actual and potential researchers of these materials ... The Science and Technology of Carbon Nanotubes The Science and Technology of Carbon Nanotubes Edited by Kazuyoshi Tanaka Kyoto Universit...

Ngày tải lên: 05/03/2014, 17:20

... 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 In summary, ... tube-like carbon shell structure and a carbonization e€ect for the transformation of Si NWs to SiC nanowires At a relatively low substrate temperature ($900°C), the...

Ngày tải lên: 16/03/2014, 15:04

... 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 ... decomposition of hydrocarbons Carbon 2000;38(14):2041–5 Montoro LA, Rosolen JM A multi-step treatment to effective purification of single-walled carbon nanot...

Ngày tải lên: 20/03/2014, 13:06

... deformations Mechanical Properties of Carbon Nanotubes 297 Fig HREM images of bent nanotubes under mechanical duress (a) and (b) single kinks in the middle of SWNT with diameters of 0.8 and 1.2 ... 10) nanotubes a pseudogap of the order of 0.1 eV is predicted to open up in the density of states due to the breaking of mirror symmetry in the rope [18] Mechanical...

Ngày tải lên: 24/03/2014, 05:20

... et al Figure Morphology of CNTs grown under different dc bias voltages FESEM images of CNTs grown under (a) -200 V, (b) -100 V, and (c) V (d) TEM images of CNTs grown under V (inset shows a higher ... 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 def...

Ngày tải lên: 06/05/2014, 08:53

... finite density of states of the nanosystem Derivation of this density of states in the presence of external perturbations is a difficult task We present some examples of the modification of the nanotube ... Structure of the DNA/CNT Hybrid 10.4.2 Electrostatics of Elution of the DNA/CNT Hybrid 10.5 Effects of Protein Adsorption on the Electronic Properties of Single Walled...

Ngày tải lên: 04/06/2014, 14:50

... thinking Because of the synthesis impairment, acetylcholine is decreased in the neurons in the Alzheimer disease brain, leading to the incapability of learning, memory, and thinking Providing ... there are great possibilities for them to be used in the construction of drug delivery systems in not too long a time The functionalization of CNTs used in the...

Ngày tải lên: 20/06/2014, 22:20

... MWNT nanofluids and the theoretical values Figure TEM images of cured epoxy samples (a) Resin loaded with wt.% MWNT and (b) with wt.% FGS Table Thermal conductivity of epoxy nanofluids and nanocomposites ... carbon- based nanofillers, in particular, nanotubes and graphene sheets, on the thermal conductivity of an uncured liquid epoxy resin There have bee...

Ngày tải lên: 20/06/2014, 23:20

... Shaw EJ, Schlogl R, Hart AJ, Hofmann S, Wardle BL: Nanoscale Zirconia as a Nonmetallic Catalyst for Graphitization of Carbon and Growth of Single- and Multiwall Carbon Nanotubes J Am Chem Soc 2009, ... hydrocarbon dissociation [46] All carbon systems The formation of CNT on the cathode in the arc-discharge route can occur without catalyst addition as shown by the work...

Ngày tải lên: 21/06/2014, 04:20

... found that oxygen-containing radicals also appear to be essential for the growth of CNWs in our growth attempts Hung et al attributed the formation of nucleation sites for the growth of CNWs ... doi:10.1186/1556-276X-6-202 Cite this article as: Yu et al.: Growth of carbon nanowalls at atmospheric pressure for one-step gas sensor fabrication Nanoscale Rese...

Ngày tải lên: 21/06/2014, 05:20

... temperature synthesis of VA-CNTs Large-scale Monte Carlo simulations [37] of SWNT synthesis showed that PECVD methods were more suitable for low temperature synthesis and had two orders of magnitude ... Plasma-heating effect of the substrates casts doubts on the credibility of previously reported results of low temperature synthesis of CNTs/CNFs using high plasma power H...

Ngày tải lên: 21/06/2014, 07:20

... diameter of the carbon solid spheres is about 250 nm The yield of the carbon solid spheres is about 50–55% in the TEM observation Direct observation for the graphite structure of the as-prepared carbon ... hollow capsules So, the reaction temperature needs to be increased further for the formation of solid carbon spheres The details of the process f...

Ngày tải lên: 22/06/2014, 00:20