Effects of pyrolysis temperature on structural, Raman, and infrared properties of perovskite PbTiO3 nanotubes

• Published in: Journal of the Korean Physical Society Vol. 68; no. 4; pp. 545 - 550
• Main Authors: Yang, Sun A., Kim, Byung Hoon, Cho, Sam Yeon, Han, Jin Kyu, Bu, Sang Don, Choi, Yong Chan
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Physical Society 01.02.2016; 한국물리학회
• Subjects: Mathematical and Computational Physics; Particle and Nuclear Physics; Physics; Physics and Astronomy; Theoretical; 물리학; nanotubes; Pyrolysis; Tetragonality; PbTiO; Sol-gel process
• ISSN: 0374-4884; 1976-8524
• DOI: 10.3938/jkps.68.545

In this work, we investigated the effects of the pyrolysis temperature on the structural, Raman, and infrared properties of PbTiO 3 nanotubes (PTO-NTs). The PTO-NTs were synthesized by spin coating a sol-gel solution on porous anodic alumina membranes, followed by the pyrolysis step at 400 − 600 ℃. Then, PTO-NTs were finally crystallized at 600 − 700 ℃ in an oxygen atmosphere to get the perovskite phase. The PTO-NTs had an outer diameter of about 420 nm and a wall thickness of about 10 nm. X-ray diffraction patterns showed that the tetragonality ( c / a ) increased from 1.019 to 1.028 as the pyrolysis temperature was increased from 400 to 600 ℃. Raman spectroscopy showed that the phonon modes of A 1 ( n TO) and E ( n TO) increased with a redshift of the A 1 (3TO) mode as the pyrolysis temperature was increased. In the Fourier-transform infrared spectra of PTO-NTs embedded in the porous anodic alumina membrane, the transmittance of the band at 499 cm −1 increased as the pyrolysis temperature was increased, which might be due to an increase in the tetragonality.