Progress of electromagnetic wave leakage absorption film using SWCNT spray

CNT has a very light density of about half that of aluminum, but its strength is about 20 times that of steel, its current density resistance is more than 1000 times that of copper, and it also has higher thermal conductivity than copper. Although it is an excellent material that is expected to be used in various fields, its usage is special and it was difficult for everyone to handle it easily. We have succeeded in developing a flexible and stretchable CNT paint with the aim of applying this excellent material to DEA electrodes. This CNT paint can be easily applied to various materials by using a spray or other methods and since it can expand and contract, it can be applied to easily deformable materials such as polymers, wood, paper, and resin. It is possible to add the characteristics of CNT to various materials. One of the characteristics of CNTs that has been attracting attention in recent years is the radio wave absorption effect. In the later part of 2021, based on the results obtained from early that year, the shielding effect and absorption rate were measured and verified for the radio wave absorption effect in the millimeter wave bands. This research was conducted since the band is being increasingly used for systems like the automobile collision prevention radar system or 5G. In this experiment, we also conducted a demonstration experiment using an in-vehicle millimeter-wave radar system for the purpose of verifying its practicality. The purpose of this experiment was to prevent the target from being detected by applying SWCNT paint using the evaluation radar system used in the development of the in-vehicle millimeter-wave radar system.