Flahaut E. – TechConnect Briefs

Unusual thermal diffusion of carbon nanotubes in a thermoplastic polymer

Tishkova V., Pavlenko E., Puechmont P., Flahaut E., Bacsa W.S., CEMES, Univ. Toulouse, FR

The dispersion of carbon nanotubes in polymer composites is a major challenge. Although nanotubes have a high aspect ratio, their tendency to agglomerate limit percolation at low loading. We find that thermal diffusion is reducing [...]

Dispersing carbon nanotubes in polymer nanocomposites: detecting individually dispersed tubes

Tishkova V., Bonnet G., Puechmont P., Flahaut E., Bacsa W.S., CEMES, Univ. Toulouse, FR

Carbon nanotubes (CNTs) are used to make polymer composites conductive. Small amounts of CNTs (0.1-1 wt%) increase the conductivity by several orders of magnitude. The electrical percolation threshold depends strongly on the dispersion state of [...]

Chemical doping by sulfuric acid in double wall carbon nanotubes

Puech P., Ghandour A., Sapelkin A., Flahaut E., Dunstan D., Bacsa W., CEMES CNRS Univ Toulouse, FR

Charge transfer due to chemical doping in carbon nanotubes [1] can be detected through changes in the band shape and spectral shifts of the Raman G-band. In double wall carbon nanotubes, the inner tube is [...]

Heating double wall carbon nanotubes with UV photons

Puech P., Bassil A., Flahaut E., Bacsa W.S., University Paul Sabatier, FR

Light absorption leads inevitably to electronic excitation and inelastic electron scattering, creating phonons and resulting in the increase of the lattice temperature. By using photons with energies significantly above the fundamental band gap of the [...]

Diagnostics of carbon nanotube composites by Raman spectroscopy

Puech P., Bassil A., Barrau S., Demont P., Bacsa R.R., Bacsa W.S., Flahaut E., Bacsa R.R., Bacsa W.S., University Paul Sabatier, FR

Carbon nanotube polymer composites are very promising for applications due to their exceptional mechanical and electronic properties to improve the elastic properties of polymers or to make polymers conductive. The large surface of carbon nanotubes [...]

Structural and Mechanical Properties of Double Wall Carbon Nanotubes

Bacsa R.R., Bacsa W.S., Flahaut E., Laurent Ch., Peigney A., Puech P., Bacsa R.R., Bacsa W.S., LPST Université Paul Sabatier, FR

Narrow diameter double walled carbon nanotubes can now be grown by the catalytic chemical vapor deposition process with high yield. Double walled carbon nanotubes are the molecular analogs to coaxial cables and they can also [...]