We have investigated the contact electrification mechanism of identical materials using micro-patterned polydimethylsiloxane (PDMS) polymers. Commercially available sandpapers with various grit sizes were used for systematic control of the micro-patterns. Microstructure and hardness measurements revealed that the micro-patterns of sandpaper were successfully transferred to PDMS without significant change of the Young’s modulus. Clear triboelectric outputs were observed when contact separation was performed for identical PDMS polymers. The triboelectric outputs were significant when the microstructure was different, while the outputs were small when the microstructure was similar. These results were explained by the bond-breaking and ion/material transfer due to the roughness-induced temperature differences in identical PDMS polymers.

我们使用微图案聚二甲基硅氧烷 (PDMS) 聚合物研究了相同材料的接触带电机制。具有各种粒度的市售砂纸被用于微图案的系统控制。微观结构和硬度测量表明，砂纸的微图案成功转移到 PDMS 上，而杨氏模量没有显着变化。当对相同的 PDMS 聚合物进行接触分离时，观察到清晰的摩擦电输出。微观结构不同时摩擦电输出显着，而微观结构相似时输出很小。这些结果可以通过由于相同 PDMS 聚合物中粗糙度引起的温度差异导致的键断裂和离子/材料转移来解释。