Nanostructured amorphous films exhibit complex thermodynamic and kinetic behavior. To understand the structure and properties of nanostructured amorphous films in silicon based ceramics (Si3N4, SiC, Si) and in SrTiO3 ceramics, we have focused on experimental studies to determine the interband electronic structure and optical properties. We use vacuum ultraviolet spectroscopy for bulk materials,...

We studied the atomic structure of ultrathin silica films on Pt(111) in comparison with the previously studied films on Mo(112) and Ru(0001). The results obtained by scanning tunneling microscopy, photoelectron spectroscopy and infrared reflection absorption spectroscopy suggest that the metal-oxygen bond strength plays the decisive role in the atomic structure of the silica overlayers on metal...

Au-Pd bimetallic model catalysts were synthesized as alloy clusters on SiO2 ultrathin films under ultrahigh vacuum (UHV) conditions. The surface composition and morphology were characterized with low energy ion scattering spectroscopy (LEIS), infrared reflection absorption spectroscopy (IRAS), and temperature programmed desorption (TPD). Relative to the bulk, the surface of the clusters is enri...

The vibrational spectral differences of normal and lung cancer cells were studied for the development of effective cancer cell screening by means of attenuated total reflection infrared spectroscopy. The phosphate monoester symmetric stretching nu(s)(PO3(2-)) band intensity at ~970 cm(-1) and the phosphodiester symmetric stretching nu(s)(PO2(-)) band intensity at approximately 1,085 cm(-1) in n...

BInGaN quaternary alloys with up to 2% boron and 14% of indium have been grown on GaN/sapphire template substrates by metal-organic vapour phase epitaxy (MOVPE). Epitaxial layer composition was determined by secondary ion mass spectroscopy (SIMS), and confirmed by X-ray photoelectron spectroscopy (XPS). Bandgap energies were measured using optical transmission and reflection similar to the incr...

Low-coherence spectroscopy (LCS) is a spectroscopic method that allows for quantitative and localized assessment of absorption spectra by combining reflection spectroscopy with low-coherence interferometry. We describe absorption coefficient (mu(a)) measurements by LCS in tissue simulating phantoms with varying scattering and absorbing properties. We used LCS in the 455-680 nm wavelength range ...

Non-specific adsorption of immunoactive compounds on biosensor surfaces is an important concern in biosensor development. In this study, minimization of nonspecific adsorption onto selfassembled monolayer (SAM) biosensor platforms was studied using electrochemical immunoassay techniques. To compare non-specific adsorption resistance, Au electrodes individually modified with decanethiol (DT), te...

Tumor imaging by terahertz spectroscopy of fresh tissue without dye is demonstrated using samples from a rat glioma model. The complex refractive index spectrum obtained by a reflection terahertz time-domain spectroscopy system can discriminate between normal and tumor tissues. Both the refractive index and absorption coefficient of tumor tissues are higher than those of normal tissues and can ...

In this paper, we present a detailed investigation on monolayer formation with thicknesses amounting 1 nm to 3 nm on silicon and silicon nitride surfaces. Thermal and photochemical methods are successfully used to form such stable and densely backed monolayers. Further, functionalisation of these surfaces with activated esters, amine groups are also presented. Static water contact angle measure...

An experimental station for surface science has been constructed at the infrared beamline (BL43IR) of SPring-8, Japan. The station utilizes synchrotron radiation in the energy range of 100–20000 cm 1 to perform infrared reflection absorption spectroscopy (IRAS) of surfaces. It consists of an experimental section, a preparation chamber, gas handling equipment and a pair of focusing optics. In si...