spectroscopy – TechConnect Briefs

In-situ techniques in optical spectroscopy for the analysis of carbon nanotubes

Freihofer G., Mohan B., Raghavan S., University of Central Florida, US

Optical Spectroscopy has shown promise as a fundamental characterization tool for carbon nanotubes (CNTs). With the potential of CNTs being utilized for aerospace applications, in-situ techniques including temperature and strain measurements with spectroscopy, are gaining [...]

Studies of Hybrid Nano-Bio-System: Single-Walled Carbon Nanotubes and Hydrogenase

Svedruzic D., Blackburn J.L., McDonald T.J., Heben M.J., King P.W., National Renewable Energy Laboratory, US

We have examined changes in single-walled carbon nanotubes (SWNT) optical signals upon addition of recombinant [FeFe] hydrogenases from Clostridium acetobutylicum or Chlamydomonas reinhardtii. We found evidence that novel and stable charge-transfer complexes are formed only [...]

Nanocatalysts Assisted Growth of Diamond Films on Si by Hot Filament CVD

Teng C.C., Ku F.C., Deng J.P., Sung C.M., Lin C-T, Northern Illinois University, US

Four different catalysts, nano-Ni, diamond powder (250 ~ 350nm), mixture of nano-Ni/diamond powder, and ultrasonicated nanodiamond (50 nm) seed, on Si wafers were employed to investigate diamond film growth by hot filament CVD (HFCVD). Both [...]

The Impact of Advanced S/TEM on Atomic-Scale Characterisation and Analysis

Hubert D.H.W., Freitag B., Stokes D.J., FEI Company, NL

As the limits of nanotechnology are expanded ever further, so too must we push back the frontiers of imaging and analysis. The need for tools that can deliver new, ultra-high resolution information is driving the [...]

Near-Field Raman and Luminescence Spectroscopies to evidence chemical heterogeneity of surfaces with sub-wavelength spatial resolution

Humbert B., Grausem J., Dossot M., Cremel S., LCPME UMR 7564 CNRS-UHP, FR

Near-field scanning optical microscopy (NSOM or SNOM) offers the opportunity to collect optical information at a spatial scale well below the diffraction limit. Using a silica fiber tip coated with aluminum and having a small [...]

Parallel two channel near and far field fluorescence microscopy

Verdes D., Rabe M., Seeger S., University of Zurich, CH

We report a new two channel fluorescence microscopy technique for surface-generated fluorescence. The realized fluorescence microscope allows high resolution imaging of aqueous samples. The core element of the instrument is a parabolic mirror objective that [...]

Utilizing Silver and Gold Nanoparticles for Investigation of Bacterial Cell Wall Biochemical Structure

Culha M., Kahraman M., Yazici M.M., Sahin F., Yeditepe University, TR

Understanding fundamental principles of living systems in their natural environment is always a challenge for scientists. The desire to design and construct novel diagnostic tools makes this understanding a significant prerequisite. Due to its “fingerprinting” [...]

Specific and Non-specific adsorption of Proteins on Solid Interfaces

Rabe M., Zimmermann J., Verdes D., Seeger S., University of Zurich, CH

We present a comprehensive mechanistic study of the non-specific adsorption of β-Lactoglobulin on a solid interface by comparing the adsorption kinetics of this protein to theoretical predictions of reported models. Important experimental observations were increasing [...]

Nanostructured photocatalytic TiO2-xNx thin films prepared by reactive magnetron sputtering

Teodorescu C.-M., Luca D., National Institute of Materials Physics, RO

Nitrogen-doped titania films were grown by magnetron sputtering. XPS analysis was used to identify the nitrogen content and the oxygen stoichiometry of the samples. XANES evidenced an increase of the Ti 3d charge density. XRD [...]