· 논문명 : Catechol grafted rGO/MXene heterosheet structures for high performance electromagnetic interference

               shielding and thermal management applications 

· 저   자 : Sushant Sharma, Byeongjin Park, Samanth Kokkiligadda, Soumyabrata Basak,Sung-Tae Hong, 

               Seung Hyun Hur, Jin Suk Chung*

· 게재지 : Carbon (2024, 219, 118844)

· 초록

Recently, the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) have received great attention for the development

Two-dimensional MXenes have shown extraordinary potential in various scientific areas, including energy harvesting and microwave 

shielding.Despite their outstanding properties, MXene-based scaffolds suffer from vulnerable mechanical fragility and environmental 

instability, which reduces the operational life. Here, we used a nature-inspired strong surface adhesion to assemble a stacked hetero-

sheet structure of reduced graphene oxide (rGO) and MXene (Ti3C2TX). Catechol bonding of self-triggered polydopamine between these

two-dimensional nanofillers resulted in a dense and well-ordered structure, transforming their mechanical and electrical properties to 

those of a freestanding sheet. The simultaneous grafting of catechol and the formation of stacked heterosheets with rGO not only

protectsthe MXene sheets from environmental oxidation but also preserves their intrinsic transportation properties. The resulting rGO/

MXene composite sheet was ordered and dense, with a tensile strength of 86 MPa and toughness 118.2 MJm-3. The ultrathin, highly 

flexible, and conductive (26.5 Scm-1) composite sheet exhibited specific shielding effectiveness of 16340, 19136 and 21340 dBcm2g-1

in the X, Ku, and K bands, respectively. Additionally, it showed outstanding Joule-heating properties, with a rapid thermal response of

approximately 2 s and the ability to reach a saturation temperature >120 ◦C at a relatively low supplied voltage of <7 V. The grafted

rGO/MXene composite sheet maintained its transportation properties, electromagnetic interference shielding, and electrothermal 

properties even after 60days of continuous exposure to ambient by suppressing oxidation attacks. The synergistic enhancement of 

physical  properties and environmental stability in the composite sheet suggest a great potential for high-performance, flexible 

shielding, and thermal management applications in aerospace and automobile electronics.