Development of High Efficient EMI Shielding 2D Material Coated Fabric

Abstract

With the raising need in attaining materials with high electromagnetic interference shielding effectiveness (EMI SE) in the technology, defense and other variant sectors, the recently discovered 2D materials showed to be the top candidate for its promising mechanical and electrical properties. To develop high durability and flexibility in 2D materials, Ti3C2Tx also known as Mxene was coated on cotton fabric using different methods in which Vacuum filtration method showed to be the most efficient. To improve the coating in the vacuum filtration machine, different processes to the Mxene solution was explored and compared in which probe sonicating the Mxene solution showed to be the most effective. Additionally, Freeze drying the Mxene solution was investigated and was found to achieve remarkable improvements on the total EMI SE. The optimum Mxene coated cotton was achieved by freeze drying the Mxene solution and probe sonicating it which achieved an astonishing high EMI SE of 26.5 dB. The shielding was furtherly improved by combining two of the optimum cotton layers together to achieve an EMI SE of 35.8 dB which increases with the increase of the incident wave frequency. However, the EMI SE significantly drops when combining more than two layers due to the increase in the spaces between the layers which allow leakage of incident waves. Applying an adhesive between the Mxene coated layers, increasing the Mxene flakes concentration and using different cotton textile with higher liquid absorbance is recommended to furtherly enhance the EMI SE for future projects.

Date of Award	May 2020
Original language	American English
Supervisor	KIN Liao (Supervisor)