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The structure of tubular GaN coaxially grown on ZnO nanorods with thickness of 6–12nm was investigated using x-ray absorption fine structure (XAFS) at the Ga K edge. The XAFS measurements revealed that the GaN had a distorted-wurtzite structure, and that there were more distortions in the bond length of Ga–Ga pairs than in Ga–N pairs. However, no extra disorders were observed in any of the pairs. These results strongly suggest that Ga atoms first bonded to the ZnO template. Unlike other techniques, the XAFS determines structure around a selected species atom in nano-heterostructures.

Local structure around Ga in ultrafine GaN∕ZnO coaxial nanorod heterostructures