Organic microcantilevers based on reduced graphene oxide composite for electrostrictive energy harvesting

[摘要] Electrostrictive materials are promising for mechanical energy harvesting applications because of their high power density, low cost and scalability. In this paper, strain sensitive nanocomposite materials based on reduced graphene (rGO) and PDMS are used for energy harvesting; they are characterized by a high electrostrictive coefficient (2.4x10-15m2/V2) and a giant dielectric constant (ranging from 100 to 1000 at 100 Hz, depending of rGO concentration). Using these nanocomposite materials, electrostrictive MEMS microgenerators are fabricated with an innovative low-cost and environment friendly process in an all-organic approach. The fabricated microcantilevers exhibit excellent mechanoelectrical performances in dynamic mode. With an acceleration of 1 g of the microcantilever base using a shaker, experiment at the first resonant mode (≈ 16 Hz) generates an electrical power density of 8.15 μW/cm3.

[发布机构] Université de Bordeaux, IMS, UMR 5218, 351 Cours de la Libération, Talence Cedex; 33405, France^1;CRPP, CNRS, UPR8641, 115 Avenue Schweitzer, Pessac; 33600, France^2

[效力级别] 能源学

[关键词] Electrical power density;Electrostrictive coefficients;Electrostrictive materials;Environment friendly process;Giant dielectric constants;High power density;Mechanical energies;Reduced graphene oxides