Production and On-Line Characterization Laboratory

This laboratory has the necessary equipment for the production of SWNTs.We count with vertical and horizontal bed reactors. A great advantage of fluidized bed reactors is that they permit continuous addition and removal of solid particles from the reactor, without stopping the operation.

Temperature programmed techniques (TPR and TPO) are performed to determine coke deposits and reducible species on the catalysts as well as SWNT yield in the reaction.

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Role of water on the surface-guided growth of horizontally aligned
single-walled carbon nanotubes on quartz

The role of water in carbon feed on the surface-guided growth of horizontally aligned single-walled carbon
nanotubes (HA-SWCNTs) was investigated. It is shown that the amount of water can be optimized to favor HA-SWCNT growth, which is proposed to be due to selective etching of carbon deposits at carbon–metal interface. Without water, nanotube–nanotube interaction and carbon accumulation at the interface are disproportionately large compared to the rate of nanotube growth, leading to catalyst deactivation. With excess water, suppression of nanotube growth occurs, resulting in reduced carbon yield on the surface.
Intermediate carbon/water feed ratios achieve cleaner growth with high efficiency.

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