We report the effects of wall-thickness on the morphology and structure of PbTiO 3 nanotubes (PTO-NTs). The PTO-NTs were fabricated via template-directed growth in conjunction with sol-gel process and spin-coating technique. Wall-thickness was increased from 10 to 70 nm by repeating the process of 'spin-coating and subsequent pyrolysis'. X-ray diffraction patterns showed that the PTO-NTs exhibited a tetragonalstructure. We found that their tetragonality increased from 1.0310 to 1.0487 as wallthickness increased from 10 nm to 70 nm. Raman spectroscopy revealed that peak positions of E(1TO) phonon corresponding a-axis shifted toward higher frequency due to their residual stress in the PTO-NTs.

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