University Paul Sabatier – TechConnect Briefs

Vibrational spectroscopy of nanoscale needle shaped histamine

Sonois V., Faller P., Bacsa W.S., Fazouan N., Estève A., University Paul Sabatier, FR

Amino acids in aqueous solutions have low Raman signals and are difficult to detect at low concentrations. To increase Raman signals one often uses UV excitation. We find that nano-needels can be grown from droplets [...]

Depth resolution capabilities using optical standing waves near surfaces

Neumayer F., Bacsa W.S., University Paul Sabatier, FR

The physics of standing waves has been explored for more than 50 years. Standing wave fields can be used to selectively enhance luminescence or enhance the Raman signal. We explore here the optical standing wave [...]

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 [...]

Local diffuse light scattering and surface inspection

Caumont M., Bacsa W.S., University Paul Sabatier, FR

Overlap of the incident and scattered field from local surface non-uniformities lead to lateral standing waves which can be mapped using a scanning optical probe in collection mode. The lateral standing waves form diffraction fringes [...]

Cubic and oriented Ag nano-particles by high vacuum evaporation

Berner D., Zuppiroli L., Caumont M., Bacsa W.S., University Paul Sabatier, FR

Optical properties of metal nanoparticles depend strongly on size and shape. Controlling these parameters implies improving the control of their optical properties. Metal nanoparticles find applications in photonics, biological labeling and catalysis. A number of [...]

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 [...]