Study Of PDMS Based Triboelectric Nanogenerator And Its Electrical Performance Under Ultimate Force

Nanogenerator（NG）has promising application prospects in energy supply for small electronic devices and wireless sensor networks.As one of its representatives,triboelectric nanogenerator（TENG）realizes energy harvesting and conversion based on the coupling effects of triboelectrification and electrostatic induction.However,electrical output performance and durability are main problems that limits its practical application.In order to meet the above challenges,this paper proposes a new TENG device with a double-sided microstructural triboelectric layer.Comparing with planar type TENG device,the device not only exhibits excellent electrical output performance but also presents good durability.The main work of this paper is as follows:（1）The Polydimethylsiloxane（PDMS）film with surface microstructure was prepared by using the micro-structured aluminum plate obtained by wet etching method as an imprinting template.Subsequently,four types of TENG devices were fabricated by adjusting the microstructure of upper and lower surfaces for the triboelectric layer:planar（i.e.,structure 1）type,triboelectric layer lower surface with microstructure（i.e.,structure 2）type,triboelectric layer upper surface with microstructure（i.e.,structure 3）type,and triboelectric layer with double-sided microstructure（i.e.,structure 4）type.（2）Based on the analysis of equivalent model and working mechanism of vertical contact-separation（CS）type TENG,factors affecting electrical output of CS type TENG were explored through methods of experimental testing,simulation,and theoretical calculation.The results demonstrate that both transfer charge Q_SC and open-circuit voltage V_OCof CS type TENG has an overall increasing trend along with raising mechanical frequency,force,and device area;potential distribution gradually converges towards the middle of plates with increasing separation distance x（t）;the electrical potential difference increases with increasing separation distance x（t）and plate area S and the increasing trend gradually slows down;the electrical potential difference slightly decreases with increasing dielectric layer thickness d.（3）A comparative study on the electrical output performance of the four structural types of TENGs was conducted.The results show that the electrical output of structure type 3 TENG with a microstructure on the upper surface of the triboelectric layer,is 1.3times than that of structure type 1 TENG.Structure type 4 TENG,which was simultaneously introduced microstructure on the upper and lower surface of the triboelectric layer,not only exhibits excellent electrical output performance but also presents good durability.（4）The electrical output performance of structure type 2 TENG and structure type4 TENG under ultimate force was studied and compared.The results demonstrate that the electrical output of structure type 2 TENG increases with increasing contact force in the range of 10～60 N;while the electrical output of structure type 4 TENG first increases with increasing contact force in the range of 10～50 N,and then towards saturation with increasing contact force in the range of 50～60 N.In addition,the electrical output of structure type 4 TENG is significantly higher than that of structure type 2 TENG.Based on the results of this study,a TENG model with regular pyramid structures on the upper surface of the triboelectric layer was designed and established to further study the effect of contact force,structure density and size,and deformation on the output of TENG.