Efficient piezoelectric ZnO nanogenerators based on Au-coated silica sphere array electrode
Yeong Hwan Ko, Goli Nagaraju, Jae Su Yu1
1Department of Electronics and Radio Engineering, Institute for Laser Engineering, Kyung Hee University, 1 Seocheon-dong, Giheung-gu, Yongin-si, Gyeonggi-do 446-701, Republic of Korea. jsyu@khu.ac.kr.
Nanoscale Research Letters
|December 6, 2013
Summary
We developed improved piezoelectric nanogenerators using ZnO nanorods and a novel Au-coated silica sphere electrode. This design significantly boosts electrical output by enhancing nanorod bending for more efficient energy harvesting.
Area of Science:
- Materials Science
- Nanotechnology
- Energy Harvesting
Background:
- Piezoelectric nanogenerators (NGs) are crucial for harvesting mechanical energy.
- Optimizing electrode design is key to enhancing NGs' performance.
- Zinc oxide (ZnO) nanorods offer promising piezoelectric properties.
Purpose of the Study:
- To develop an efficient top electrode for ZnO nanorod-based piezoelectric NGs.
- To investigate the impact of surface roughness on piezoelectric charge output.
- To enhance the mechanical-electrical energy conversion efficiency of NGs.
Main Methods:
- Fabrication of ZnO nanorod arrays.
- Development of an Au-coated silica sphere array as a top electrode.
- Characterization of piezoelectric output under mechanical force.
- Theoretical investigation of sphere-nanorod interaction and bending.
Main Results:
- The Au-coated silica sphere array significantly enhanced ZnO nanorod bending due to increased surface roughness.
- Piezoelectric output current and voltage increased by approximately 2.01 and 1.51 times, respectively, under a 0.3 kgf force compared to a conventional electrode.
- The study provided theoretical insights into the bending radius of ZnO nanorods influenced by the silica spheres.
Conclusions:
- Au-coated silica sphere arrays serve as highly effective top electrodes for ZnO nanorod piezoelectric NGs.
- This electrode design substantially improves piezoelectric charge output and energy conversion efficiency.
- The findings offer a pathway for developing more advanced and efficient nanogenerator devices.
