Tethered deuterated polystyrene-block-polymethyl methacrylate films have been examined by X-ray\ud scattering both in their native state and following treatment with ruthenium tetroxide. The use of the\ud stain, while increasing the thickness of the films, does not significantly alter the lateral structure or\ud periodicity of the films and provides contrast between the two blocks. Both the periodicity of the films\ud and the structure normal to the surface have been identified following staining. Experiments were also\ud performed on films treated by a solvent exchange process, and the effects of staining on these films are\ud discussed
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