| Summary: | The encapsulation of halides and other materials within SWNTs makes possible the study of I D crystal structures formed on the smallest scale possible. For example, we have shown that either 2 x 2 or 3 x 3 atomic layer thick KI crystals can be formed in SWNTs according to their diameter. Such crystals have reduced coordination (e.g, all the atoms in the 2 X 2 crystal are 4:4 coordinated) and exhibit lattice distortions compared to the corresponding bulk halide. With respect to more complex binary structures, such as 3D network, chain halides, layered halides, or complex 3D oxides, ID crystals of these structures can be studied. The application of advanced HRTEM imaging techniques to these materials is also described.
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