Piezoelectric composites have attracted significant research interest as sustainable power sources for electronic devices due to their high mechanical stability and electrical output characteristics. This study investigated the optimal processing conditions for fabricating a flexible piezoelectric energy harvester based on Pb(Zr,Ti)O3 (PZT) powder and a polyimide (PI) matrix composite. Various parameters, including the optimal mixing ratio of PI/PZT, ultrasonic treatment, homogenization, vacuum oven, and UV/O3 treatment, were optimized to achieve a uniform piezoelectric composite. A PZT content of 30 wt% and 20 minutes of homogenization were identified as the most effective conditions for increasing the uniformity of the composite. The optimized composite exhibited a high piezoelectric coefficient, a typical P-E hysteresis loop, and dielectric properties, exhibiting a voltage output that adjusts in response to variations in the applied touch force. This study provides foundational data for the uniform fabrication of flexible piezoelectric energy harvesters and next-generation miniaturized electronic devices.

1. Introduction
2. Experimental Section
    2.1. PI/PZT 유연 압전복합체 제작
    2.2. PI/PZT 유연 압전복합체 특성분석
3. Results and Discussion
4. Conclusion
Funding
Conflict of Interest
Data Availability Statement
Author Information and Contribution
Acknowledgement
References

• 이준기(전북대학교 JBNU-KIST 산학연융합학과, 전북대학교 신소재공학부 전자재료공학 전공) | Junki Lee (Department of JBNU-KIST Industry-Academia Convergence Research, Jeonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea, Division of Advanced Materials Engineering, Jeonbuk National University Jeonju, Jeonbuk 54896, Republic of Korea)
• 윤상일(전북대학교 JBNU-KIST 산학연융합학과, 전북대학교 신소재공학부 전자재료공학 전공) | Sang-il Yoon (Department of JBNU-KIST Industry-Academia Convergence Research, Jeonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea, Division of Advanced Materials Engineering, Jeonbuk National University Jeonju, Jeonbuk 54896, Republic of Korea)
• 정창규(전북대학교 JBNU-KIST 산학연융합학과, 전북대학교 신소재공학부 전자재료공학 전공, 전북대학교 에너지저장변환공학과(BK21 FOUR)) | Chang Kyu Jeong (Department of JBNU-KIST Industry-Academia Convergence Research, Jeonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea, Division of Advanced Materials Engineering, Jeonbuk National University Jeonju, Jeonbuk 54896, Republic of Korea, Department of Energy Storage/Conversion Engineering of Graduate School (BK21 FOUR), Jeonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea) Corresponding author
• 김현승(전북대학교 신소재공학부 전자재료공학 전공, 전북대학교 에너지저장변환공학과(BK21 FOUR)) | Hyunseung Kim (Division of Advanced Materials Engineering, Jeonbuk National University Jeonju, Jeonbuk 54896, Republic of Korea, Department of Energy Storage/Conversion Engineering of Graduate School (BK21 FOUR), Jeonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea)