| Abstract
| - Nanowires, sandwiched nanoribbons, and nanotubes of SnO2 are synthesized using elevated temperaturesynthesis techniques, and their structures are characterized in detail by scanning electron microscopy (SEM)and transmission electron microscopy (TEM). In addition to the normal rutile structured SnO2, it has beenpossible to form an orthorhombic superlattice-like structure in the present study. The orthorhombic structurecan form in a thin nanowire, coexist with the normal rutile structured SnO2 in a sandwiched nanoribbon, oroccur in the form of nanotubes. This result is distinct from that for bulk SnO2 where pressures in excess of150 kbar are required to form the orthorhombic form. The orientation relationship between the orthorhombicSnO2 and the rutile structured SnO2 is determined to be [001]o || [102̄]t and (100)o || (010)t for the nanowiresand sandwiched nanoribbons, and [001]o || [3]t and (110)o || (451)t for the nanotubes. Although the growthdirection of the rutile structured SnO2 nanowires is along [101]t, two growth directions are found to occur inthe nanostructures having the orthorhombic SnO2 structure. They are [010]o for nanowires and [1̄10]o for thesandwiched nanoribbons and nanotubes. The results in this study and the observation of orthorhombic SnO2may result from the formation of the products in an oxygen deficient environment.
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