Surface plasmon resonance , scanning

The catalytic activity of Ag/Pd bimetallic nanoparticles immobilized on quartz surfaces was tested for 4-nitro-3-pyrazole carboxylic acid with help from surface plasmon resonance, scanning electron microscopy, and surface-enhanced Raman scattering (SERS) measurements [1417], The SERS spectra showed that the nitro group reduces to amino group. 

More recently, the method of scanning near-field optical microscopy (SNOM) has been applied to LB films of phospholipids and has revealed submicron-domain structures [55-59]. The method involves scanning a fiber-optic tip over a surface in much the same way an AFM tip is scanned over a surface. In principle, other optical experiments could be combined with the SNOM, snch as resonance energy transfer, time-resolved flnorescence, and surface plasmon resonance. It is likely that spectroscopic investigation of snbmicron domains in LB films nsing these principles will be pnrsned extensively. 

A number of methods are available for the characterization and examination of SAMs as well as for the observation of the reactions with the immobilized biomolecules. Only some of these methods are mentioned briefly here. These include surface plasmon resonance (SPR) [46], quartz crystal microbalance (QCM) [47,48], ellipsometry [12,49], contact angle measurement [50], infrared spectroscopy (FT-IR) [51,52], Raman spectroscopy [53], scanning tunneling microscopy (STM) [54], atomic force microscopy (AFM) [55,56], sum frequency spectroscopy. X-ray photoelectron spectroscopy (XPS) [57, 58], surface acoustic wave and acoustic plate mode devices, confocal imaging and optical microscopy, low-angle X-ray reflectometry, electrochemical methods [59] and Raster electron microscopy [60]. 

Combination of Surface Plasmon Resonance (SPR) and Optical Waveguide Spectroscopy (OWS) was used for the simultaneous determination of refractive index and film thickness of the hydrogel layers in the Kretschmann configuration [24], The resulting angle scans from the SPR instrument were fit to Fresnel calculations and different layers were represented using a simple box model. A detailed description of this process has been published previously [18]. 

Fluorescence detection confocal or laser scanning devices, CCD cameras, near-infrared imaging, surface plasmon resonance imaging, flow cytometry (for microspheres)... 

Fig. 5 Surface-plasmon resonance curves, i.e., reflectivity-vs-incident angle scans of the bare substrate, a Ag coated glass slide with a thin SiC>2 layer evaporated on top (A), after the self-assembly of a reactive monochlorosilane derivative (cf. Fig. 4a) (B), after the adsorption (from solution), covalent binding, and soxhlet extraction of the polymer cushion (C), and after the deposition of a model lipid monolayer (a layer of reactive ester derivatives of a fatty acid) (D)...

Copper nanoparticles have been synthesized in silica by 50 keV Cu ion implantation with doses of 8.0x10 ion/cm. N anoparticles were c haracterized by absorption band of surface plasmon resonance in the visible range. Metal nanoparticle composite glasses were analyzed by the Z-scan method at the IR wavelength of NdiYAG laser radiation 1064 nm. The third order nonlinear susceptibility in the analyzed medium with simultaneous nonlinear refraction and absorption were considered as complex values. It is suggested that the samples with nonlinear absorption is perspective ones for optical applications. 

Kazuhiko Nakatani, Shinsuke Sando, Isao Saito, Scanning of guanine-guanine mis-matches in DNA by synthetic hgands using surface plasmon resonance. Nature Biotechnology, 19 (2001), 51-55. 

Beyond the enhancement provided by metals exhibiting surface plasmon resonances (i.e. copper, silver and gold in particular) with suitably rough surfaces, other means of enhancement have become available. The use of tip-enhancement is particularly promising. The tip of a scanning tunneUng microscope that is in close... 

Fig. 5.154. Cyclic voltammogram of poly aniline and surface plasmon resonance reflectivity with a solution of 0.5 M H2SO4, second scan, dE/dt = 20 mV-s based on data in [971]...

---