Abstract
Improvements in the properties and output electric power of functional materials will expand their applications beyond sensors. Various functional materials, such as piezoelectrets made of silicone rubber, have been developed. In this study, a piezoelectret made of natural rubber is proposed. The proposed piezoelectret was fabricated by sandwiching and bonding natural rubber between fluoroethylenepropylene films and applying corona charging. A piezoelectret made of silicone rubber was fabricated in the same way and its performance was evaluated for comparison. The surface potential and piezoelectric stress constant for the piezoelectret made of natural rubber were higher than those for that made of silicone rubber. These results suggest that natural rubber is better than silicone rubber for fabricating rubberbased piezoelectrets.
