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11. High-Performance, Wearable Thermoelectric Generator Based on a Highly Aligned Carbon Nanotube Sheet

Author

Choi, Jaeyoo, Jung, Yeonsu, Dun, Chaochao, Park, Kyung Tae, Gordon, Madeleine P, Haas, Kyle, Yuan, Pengyu, Kim, Heesuk, Park, Chong Rae, and Urban, Jeffrey J

Subjects
carbon nanotube sheet, highly aligned structure, thermoelectric energy conversion, flexible thermoelectric generator, wearable device
Abstract

A high-performance, wearable thermoelectric generator (TEG) was fabricated with a highly aligned carbon nanotube (CNT) sheet. The aligned CNT sheet exhibits extraordinary electrical conductivity compared to disordered CNT sheets and also can be directly fabricated as a continuous TEG without metal electrode interconnects. This provides a significant reduction in contact resistance between TE legs and electrodes compared to traditional TEGs, resulting in higher power output. In addition, the continuity of the module without any disconnected parts provides high degrees of mechanical stability and durability. This robust and scalable approach to flexible TEG fabrication paves the way for CNT applications in lightweight, flexible, and wearable electronics.

Published
2020

18. Super‐Toughness Carbon Nanotube Yarns by Bio‐Inspired Nano‐Coiling Engineering.

Author

Cho, Young Shik, Lee, Jae Won, Jung, Yeonsu, Park, Ji Yong, Park, Jae Seo, Kim, Sang Min, Yang, Seung Jae, and Park, Chong Rae

Subjects
BIONICS, CARBON nanotubes, SPIDER silk, LIGHTWEIGHT materials, MECHANICAL loads, CONSTRUCTION materials, BIOLOGICALLY inspired computing
Abstract

Lightweight structural materials are commonly used as effective fillers for advanced composites with high toughness. This study focused on enhancing the toughness of direct‐spun carbon nanotube yarns (CNTYs) by controlling the micro‐textural structure using a water‐gap‐based direct spinning. Drawing inspiration from the structural features of natural spider silk fibroin, characterized by an α‐helix in the amorphous region and β‐sheet in the crystalline region, multiscale bundles within CNTYs are reorganized into a unique nano‐coil‐like structure. This nano‐coiled structure facilitated the efficient dissipation of external mechanical loads through densification with the rearrangement of multiscale bundles, improving specific strength and strain. The resulting CNTYs exhibited exceptional mechanical properties with toughness reaching 250 J g−1, making them promising alternatives to commercially available fibers in lightweight, high‐toughness applications. These findings highlight the significance of nano‐coiling engineering for emulating bio‐inspired micro‐textural structures, achieving remarkable enhancement in the toughness of CNTYs. [ABSTRACT FROM AUTHOR]

Published
2024
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48. Large-scalable, ultrastable thin films for electromagnetic interference shielding.

Author

Park, Jae Seo, Park, Ji Yong, Lee, Kyunbae, Cho, Young Shik, Shin, Hyunji, Jung, Yeonsu, Park, Chong Rae, Kim, Taehoon, Kim, Jae Ho, and Yang, Seung Jae

Abstract

With increasing demands on electromagnetic interference (EMI) shielding, considerable efforts have been devoted to realizing viable EMI shielding materials with processability and stability. Here, we report the first example of a large-scalable, ultrastable, and transparent film based on conductive metal–organic frameworks (cMOFs) for EMI shielding. A cobalt-based cMOF is uniformly grown on a direct-spun double-walled carbon nanotube film (DWNTF), maximizing both conductivity and EMI shielding effectiveness (SE). Furthermore, the hybrid films preserve their high EMI SE under long-term exposure, high temperature, repeated mechanical bending, and even immersion in artificial seawater, which is the most detrimental operating condition for EMI shielding materials. This report can offer new design guidance for viable EMI shielding materials by integrating scalability and stability with high EMI SE. [ABSTRACT FROM AUTHOR]

Published
2023
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