Ultrathin Noncontact-Mode Triboelectric Nanogenerator Triggered by Giant Dielectric Material Adaption

Abstract

Noncontact-mode-operating triboelectric nanogenerators (TENGs), which directly avoid physical contact, are fascinating self-powered systems aimed at long-life operation and minimizing rubbing friction. As of now, there are still drawbacks such as the electrostatic discharge (ESD) phenomenon on the surface, which results in poor output. Herein, a noncontact TENG (nc-TENG) is designed by using calcium copper titanate (CaCu 3 Ti 4 O 12 ) with a giant high permittivity, combined with self-assembled monolayers of 1H,1H,2H,2H-perfluorooctyltrichlorosilane. All the materials constituting the nc-TENG are nanoscale in thickness, and this enables the implementation of a wearable nc-TENG that can be attached to the human body. The ESD phenomenon is prevented by using an ultraflat surface roughness material as an abutting material. In addition, by using a giant dielectric constant material, the charge capability is further improved, and the nc-TENG can be implemented for stable operation with a low power reduction rate, even when operating for a long period of time.

Materials Beyond Conventional Triboelectric Series for Fabrication and Applications of Triboelectric Nanogenerators

“…from the same group demonstrated CCTO for noncontact mode nc‐TENG. [ 82 ] The self‐assembled monolayer of 1 H , 1 H , 2 H , 2 H ‐Perfluorooctylytrichlorosilane (FOTS) was coated to improve the surface charges. The atomic‐scale flat graphene was used as the electrode to resolve the electrostatic discharge problem.…”

“…The nc‐TENG durability was tested over 40 days with output changes from 15.1 to 11.3 V. The Al 2 O 3 was also tested for the comparison whose output changes from 11 to 5 V, i.e., 54.5% reduction in the output. [ 82 ]…”

Recent trends in 2D materials and their polymer composites for effectively harnessing mechanical energy

“…The direct contact mode has the disadvantage of deformation and durability because of the continuous friction between the two materials, whereas the non-contact mode has an issue with the electric discharge problem caused by the rough surface and the output power generated. Therefore, to overcome these issues, Prof. Kim’s group fabricated an ultrathin non-contact TENG by using a high dielectric constant friction material, i.e., calcium copper titanate which is coated with the 1,1,2H,2H-Perfluorooctyltrichlorosilane (FOTS) to enhance the surface charge and ultrathin graphene as an electrically conducting material which serves as electrode to solve the electric discharge problem ( Han et al., 2021 ). The charge injection and their maintenance are required in the non-contact TENG, therefore, a thin layer of conducting material is required with an ultra-flat surface on which calcium copper titanate can be deposited.…”

All‐Metal Oxide Transparent Photovoltaic for High‐Speed Binary UV Communication Window

“…[ 13–15 ] Numerous energy harvesting methods, including for chemical (bio‐fuel cells), thermal (thermoelectric), mechanical (triboelectric, electromagnetic, and piezoelectric), and light energy (photovoltaic cells), have been considered to meet our energy production requirements. [ 16–20 ] Different forms of clean and abundant energy, such as wind, hydro, nuclear, and solar are being considered to meet the requirements of the modern world. Among these potential energy harvesting technologies, solar energy conversion has received marked interest; however, photovoltaic devices are still not widely applied for transparent optoelectronic applications.…”