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Grazing incidence SAXS

Grazing-incidence SAXS could be used to study thin polymeric films at surfaces. Organic surface layers — like Langmuir — Blodgett films — are being studied at present only by WAXS techniques [52],... [Pg.228]

SAXS is sensitive to variations in the electronic density in a material, and so provides information about the shape and size of clusters in micro PS. In contrast to the quantum wire structure proposed in early publications [Cal, Lei], the crystallites in micro PS are found to be almost spherical. There has been some evidence that the dimensions in the growth direction are somewhat smaller than those parallel to the surface [Fr2], The latter result, however, is still controversial because investigations by spectroscopic techniques indicate an opposite elongation [Mi4], A combination of grazing incidence diffraction (GID) and SAXS measurements on various freestanding micro PS films showed crystallite diameters from about 1.5 to 4 nm, depending on formation conditions. A good correlation between size reduction and blue shift of the PL peak position has been observed [Bi3],... [Pg.133]

SAXS is best suited for thin ( 0.1 mm or less) sample materials, balancing between a minimimi atomic niunber density for low absorption and a maximum atomic niunber density for scattering contrast SAXS experiments are usually performed in transmission mode. The use of grazing incidence (GI-)SAXS geometry, discussed in more detail below, enables microstructure determination within a thin film or coating in situ on the substrate. [Pg.685]


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See also in sourсe #XX -- [ Pg.693 ]




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Grazing incidence

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