Raman spectroscopy – Page 3 – 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 [...]

Experimental mechanical stress characterization of MEMS by using of confocal laser scanning microscope with a Raman spectroscopy interface

Yamaguchi M., Ueno S., Miura I., Erikawa W., Technical Research Institute Japan Society for the promotion of machine industry, JP

In this study, we demonstrate mechanical stress and shape profile measurements using confocal laser scanning microscopy (CLM) interface for Raman spectroscopy and that this system is reasonable and helpful to the MEMS designer. By combining [...]

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 [...]

Surface Enhanced Raman Scattering by 2D Photonic Crystals: Enhancement and Reproducibility

Netti M.C., Mahnkopf S., Lincoln J.R., Charlton M.D.B., Cox S.J., Ayliffe P., Zoorob M.E., Wilkinson J.S., Baumberg J.J., Perney N.M.B., Jaiswal S.L., Mesophotonics Ltd., UK

Surface Enhanced Raman Scattering (SERS) is a widely utilised technique to enhance the weak Raman spectrum of molecules, enabling detection and identification of ultralow concentrations of particular species. We show both experimentally and theoretically how [...]

Development of a New Treatment to Induce Anatase Growth on Ti

Pedeferri M., Bottani C.E., Cattaneo D., Li Bassi A., Del Curto B., Brunella M.F., Politecnico di Milano, IT

Aim of the work has been the evaluation of the application of a novel treatment of the Ti surface in order to increase anatase growth. Two different anodizing methodologies, previously developed were considered, followed by [...]

Surface-Enhanced Raman Scattering in Small Noble-Metal Nanoparticles

Pustovit V.N., Shahbazyan T.V., Jackson State University, US

We present a microscopic theory of quantum-size effects in surface-enhanced Raman scattering (SERS) from molecules adsorbed on small metal nanoparticles. In noble-metal nanoparticles, the confining potential has different effect on s-band and d-band electrons. Namely, [...]

Residual Stress Characterization in MEMS Microbridges using Micro-Raman Spectroscopy

Starman_Jr. L.A., Ochoa E.M., Lott J.A., Amer M.S., Cowan W.D., Busbee J.D., Air Force Institute of Technology, US

We characterize and measure the pre-released residual stress levels in polysilicon Micro-Electro-Mechanical Systems (MEMS) microbridges using micro-Raman spectroscopy. Raman spectroscopy is nondestructive, fast, and provides the potential for in situ stress monitoring during fabrication. Residual [...]

Stress Measurement in MEMS Devices

Starman Jr. L., Busbee J., Reber J., Lott J., Cowan W., Vandelli N., Wright-Patterson AFB, US

Due to the unique structure and small scale of Micro-Electro-Mechanical Systems (MEMS), residual stresses during the deposition processes can have a profound affect on the functionality of the MEMS structures. Typically, material properties of thin [...]