By Qing Zhang
This booklet overviews the present prestige of analysis and improvement actions of CNTs in nanodevices, nanomaterials, or nanofabrication. This publication offers 15 cutting-edge evaluate articles that disguise CNT synthesis applied sciences for becoming hugely oriented CNTs, chirality-pure CNTs and CNTs at a wide throughput and coffee expense, CNT meeting thoughts, CNT sorting and separation procedures, CNT functionalization engineering for extra functionalities, CNT primary homes and their practical/potential electric, digital, optical, mechanical, chemical and organic applications.
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Extra info for Carbon Nanotubes and Their Applications
The ultimate goal of chemical modification of SWCNTs is to achieve uniformity in chirality and electronic properties. 2 Arc Discharge In electric arc discharge method, the arc is generated by passing direct currents of 50–100 A through opposing carbon anode and cathode in an inert (helium/argon) atmosphere. The high-temperature discharge vaporizes the carbon atoms, which re-condensate to form carbon nanotubes. MWCNTs produced by arc discharge are very straight due to their high crystallinity. For the growth of SWCNTs, transition metal catalysts are needed in the arc discharge.
The NAF process reported by Wang et al. in 2002 used Fe nanoparticles supported on Al2O3 powders as the catalyst, which were fed into the reactor before the synthesis. , 2008]. Nitrogen and hydrogen gases were used as the diluents. 5 m3/h. The reaction temperature was maintained at 600–900°C for the synthesis duration of 30–60 min under ambient pressure. 08–2 m/s and the bed density of the reactor of ~20–800 kg/m3 were applied during the NAF process so that the catalyst-CNT nano agglomerates were kept in a dense phase fluidization state.
In the CoMoCAT process, highquality SWCNTs with narrow distribution of tubular diameters are synthesized by CO disproportionation at 750–950°C in flow of pure CO at a pressure of 1–10 atm using fluidized-bed reactors. 25 g SWCNT/g catalyst in a couple of hours, with better than 80% selectivity towards SWCNT synthesis. The CoMoCAT process uses a low Co:Mo loading on silica supports (SiO2 support with 6 nm average pore size and BET surface area of 480 m2/g) as efficient catalysts for SWCNT production.