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X-ray diffraction

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X-Ray Diffraction

"Powder" diffraction pattern of a crumpled (not quite powdered) origami shell, using Cu Kα radiation.  The (002) peak at ~27.5˚, corresponds to a graphene layer spacing of 0.32 nm, which is less than the 0.335 nm spacing we would expect of ideal graphite[2].  Upon closer inspection, the (002) peak is actually two distinct peaks, indicating the presence of two distinct, compressed crystalline regions within the material.
This magnified view of the bifurcated (002) peak is evidence of two distinct, compressed crystalline layers within a typical origami graphite shell.  The stress may be due to differential thermal contraction.  The origami structure forms at a temperature in excess of 1200˚C and cools to room temperature before the XRD analysis.  Although these shells are pure graphite, a glance at the origami page reveals why an origami shell may effectively be composed of two dissimilar materials.  The broad facets have a radial orientation, while the narrow facets have a more tangential orientation.