Multi-walled nanotubes synthesis

An exhaustive study has been carried out recently on the synthesis of BN nanotubes and nanowires by various CVD techniques.17 The methods examined include heating boric acid with activated carbon, multi-walled carbon nanotubes, catalytic iron particles or a mixture of activated carbon and iron particles, in the presence of ammonia. With activated carbon, BN nanowires are obtained as the primary product. However, with multi-walled carbon tubes, high yields of pure BN nanotubes are obtained as the major product. BN nanotubes with different structures were obtained on heating boric acid and iron particles in the presence of NH3. Aligned BN nanotubes are obtained when aligned multi-walled nanotubes are used as the templates (Fig. 40). Prior to this report, alignment of BN nanotubes was achieved by the synthesis of the BN nanotubule composites in the pores of the anodic alumina oxide, by the decomposition of 2,4,6-trichloroborazine at 750 °C.116 Attempts had been made earlier to align BN nanotubes by... 

SYNTHESIS OF YTTRIA STABILIZED ZIRCONIA (3YTZP) - MULTI-WALLED NANOTUBE (MWNTs) NANOCOMPOSITE BY DIRECT IN-SITU GROWTH OF MWNTs ON ZIRCONIA PARTICLES... 

Synthesis and Purification of Multi-Walled and Single-Walled Carbon Nanotubes... 

The Ba.C) N, nanotubes and fullerene-like structures have been synthesized by various laboratories in recent years. The most popular method is the plasma arc technique. The first report on the synthesis of BN nanotubes was by Zettl and coworkers (55). Since BN is an insulator, a composite anode was prepared from a tungsten rod with an empty bore in the center, which was stuffed with a pressed hexagonal BN powder. For the cathode, a water-cooled Cu rod was used. The collected gray soot contained limited amount of multi wall BN nanotubes. It is possible that in this case, the tungsten serves also as a catalyst. By perfecting this method, macroscopic amounts of double-wall BN nanotubes of a uniform diameter (2 nm)... 

Li, X., et al., Atomic layer deposition ofZnO on multi-walled carbon nanotubes and its use for synthesis of CNT-ZnO heterostructures. Nanoscale Research Letters, 2010. 5(11) p.1836-1840. 

Sheng, W., et al., Synthesis, activity and durability ofPt nanoparticles supported on multi-walled carbon nanotubes for oxygen reduction. Journal of The Electrochemical Society, 2011. 158(11) p. B1398-B1404. 

Zhou, X., et al., Facile synthesis of nanospindle-like Cu20/straight multi-walled carbon nanotube hybrid nanostructures and their application in enzyme-free glucose sensing. Sensors and Actuators B Chemical, 2012.168 p. 1-7. 

Recently, the efficacy of LDHs as catalyst precursors for the synthesis of carbon nanotubes via catalytic chemical vapor deposition of acetylene has been reported by Duan et al. [72]. Nanometer-sized cobalt particles were prepared by calcination and subsequent reduction of a single LDH precursor containing cobalt(II) and aluminum ions homogeneously dispersed at the atomic level. Multi-walled carbon nanotubes with uniform diameters were obtained. 

SYNATEC synthesis of multi-wall and single-wall carbon nanotubes. 

Tao, L., Chen, G., Mantovani, G., York, S., Haddleton, D.M., Modification of multi-wall carbon nanotube surfaces with poly(amidoamine) dendrons Synthesis and metal templating Chem. Commun. (2006), 47, 4949-4951. 

Soneda Y., Duclaux L., Beguin F. Synthesis of high quality multi-walled carbon nanotubes from the decomposition of acetylene on iron-group metal catalysts supported on MgO. Carbon, 2002, 40(6), 965-969. 

Stephan was the first to attempted direct synthesis of the B and N multi walled carbon nanotubes (BCN-MWNTs) in 1994 [15-17]. Since then, considerable progress has been made in the synthesis of BCN-MWNTs by different means of arc-discharge [16-18], laser ablation [18-20], piyolysis methods [18,21], and chemical vapor deposition [18,20-24]. Aligned BNC nanotubes have been sueeessfully fabricated by bias assisted hot filament chemieal vapor deposition [27,28]. Up to now, the only existing BCN-SWNTs synthesis was achieved via an... 

Nanoparticles are rapidly gaining popularity in biomedical, optical and electronic areas. Zapping tumors with multi-walled carbon nanotubes, solar cells to light-attenuators and chip-to-chip optical interconnects in futuristic circuitry are some of the potential applications. Thus finding novel ways for the synthesis of these new age materials is of paramount interest where radiation chemistry is modesdy playing a role and the chapter on metal clusters and nanomaterials deals with these aspects. 

SYNTHESIS OF VERTICALLY ALIGNED ARRAYS OF MIXED SINGLE/MULTI-WALLED CARBON NANOTUBES BY CVD METHOD WITH THE VOLATILE CATALYST... 

CVD method mostly used for multi-walled carbon nanotubes (MWNTs) synthesis ensures formation of vertically aligned MWNTs arrays [11]. As it was... 

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