Fourier transform MIR-NIR-Vis spectrophotometer

This is a modified Bruker Equinox 55 FTIR spectrophotometer. It has a DLATGS detector with a KBr window. Also counts with mechanical interferometer with ROCKSOLID(TM) alignment. Frequency range: 7500-370 cm-1.

The system can work in the mid and near IR as well as in the visible range. It is also equipped with a diffuse reflectance cell with an in situ reaction chamber. We can perform analysis in solids under controlled atmospheres up to 750K. Among the information obtained with this instrument are the degree of interaction of active species on the catalyst and the nature of the functional groups present in SWNT after different purification treatments. Also information about chirality can be obtained using this tecnique.

 

 

 

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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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