Developments of large scale and high-purity generation technique of single-walled carbon nanotubes (SWNTs) [1] are desired for the practical applications of the fascinating new material. In addition to previously known laser-furnace [2] and arc-discharge [3] techniques, recently, the catalytic chemical vapor deposition (CCVD) method [4] has been developed for the possible larger amount producti...

Polycrystalline Fe-doped alumina (Al2O3) ceramics have been produced and used as a substrate for organized carbon nanotubes (CNTs) growth by catalytic chemical vapor deposition (CCVD). In these substrates, Fe cations, which are the catalyst source, are initially substituted to Al in a-Al2O3, instead of being simply deposited as a thin Fe layer on the surface of the substrate. The selective redu...

A mixture of acetylene, hydrogen and ammonia C2H2/H2/NH3 is used to produce carbon nanotubes (CNTs) by a plasma-enhanced catalytic chemical vapor deposition process with hot-filaments assistance (PE HF CCVD). The investigation of gas phase and surface chemistry is performed by CHEMKINTM software. The concentration of gas phase species on the substrate is presented. Based on this study the role ...

Developments of large scale and high-purity generation technique of single-walled carbon nanotubes (SWNTs) [1] are desired for the practical applications of this fascinating new material. In addition to previously known laser-furnace [2] and arc-discharge [3] techniques, catalytic chemical vapor deposition (CCVD) methods [4] have been developed for the possible larger amount production with low...

For the first time, patterned growth of boron nitride nanotubes (BNNTs) on Si substrates has been achieved by catalytic chemical vapor deposition (CCVD). Following the boron oxide chemical pathway and our growth vapor trapping approach, high quality and quantity BNNTs can be produced. Effective catalysts have been found to facilitate the growth of BNNTs, while some critical parameters of the sy...

monometallic and bimetallic ni and co catalytic nanoparticles supported on titanium dioxide (rutile phase) substrate were prepared by wet impregnation method. these nanoparicles were used as catalysts for synthesis of multiwalled carbon nanotubes (mwcnts) from acetylene decomposition at 700°c by the catalytic chemical vapor deposition (ccvd) technique. the nanomaterials (catalyst and cnts) were...

BACKGROUND The prevalence of peripheral arterial occlusive disease (PAOD), including asymptomatic cases and cases unknown to the general practitioner (GP) was estimated in 18,884 men and women, aged 45-74 years, on the list of 18 general practice centres (GPC). METHODS The study population (n = 3171) consisted of a stratified sample of the total population. In the GPC data were collected on i...

In this work, we report a low-cost facile method for the production of few-layer graphene sheets in large quantities through radio-frequency chemical vapor deposition.