K0.5Bi0.5TiO3 (KBT) thin films were prepared by sol-gel processing for future use in piezoelectric generators. It is believed that the annealing temperature of films plays an important role in the output performance of piezoelectric generators. KBT films prepared on Ni substrates were annealed at 500 ~ 700 oC. Tetragonal KBT films were formed after annealing process. As the annealing temperature increased, the grain size of KBT films increased. KBT thin films show piezoelectric constant (d33) from 23 to 41 pC/N. The increase of grain size in KBT films brought about output voltage and current in the KBT generators. Also, the increase in the displacement of specimens during bending test resulted in increases in output voltage and current. Although KBT generators showed lower output power than those of generators prepared using NBT films, as reported previously, the KBT films prepared by sol-gel method show applicability as piezoelectric thin films for lead-free nanogenerators, along with NBT films.

Abstract
1.서 론
2. 실험방법
3. 결과 및 고찰
4.결 론
References

• 이영호(경북대학교 나노소재공학과) | Young-Ho Lee (Dept. of Nano & Materials Science and Engineering, Kyungpook National University)
• 박상식(경북대학교 나노소재공학과/경북대학교 미래과학기술융합학과) | Sang-Shik Park (Dept. of Nano & Materials Science and Engineering, Kyungpook National University/Dept. of Advanced Science and Technology Convergence, Kyungpook National University) Corresponding author