Material with excellent EMI protection. Free Technical Library News

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Material with superior EMI protection

11.08.2020

Thanks to the wide spread of a number of technologies, such as radio, television, cellular communications, Wi-Fi and Bluetooth, the entire space around us is literally permeated with radio waves. These radio signals provide the operation of one type of electronic devices, being interference for other types of devices. Because of this, the stability of wireless connections may suffer, the data transfer rate may decrease, and in some especially tragic cases, an electronic device may completely interrupt its operation due to strong interference.

To prevent the influence of electromagnetic interference on critical components of electronic equipment, engineers have long used the method of shielding protection. This method consists in the use of metallic, in most cases copper foil, which reflects unwanted radio signals in the opposite direction. This method works quite well, but the use of additional materials often adds a lot of unwanted weight and bulk to the electronic device.

In search of a new protective material, scientists from Drexel University stumbled upon titanium carbonitride, which belongs to a class of conditionally two-dimensional materials called MXene. Previously, materials of this class have already been used in the creation of conductive compositions, battery electrodes that provide fast charging, high-performance sprayed antennas, etc.

In this case, scientists have found that titanium carbonitride sheets, which are thinner than a human hair, block electromagnetic signals three to five times better than copper foil. At the same time, if the copper foil reflects signals, then the titanium carbonitride coating effectively absorbs them, reducing the average level of electromagnetic noise in the adjacent region of space.

Due to its high EMI absorbency and thinness, MXene film can be used to create individual screens for each component individually. This will also avoid unwanted mutual influence between components located in close proximity on the printed circuit board of the electronic device, which should positively affect the stability of the device, its reliability and efficiency in terms of the amount of energy it consumes.

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The company says that the authors themselves asked for this, especially those who like to create long works. Theoretically, this model will allow them to be paid more fairly.

After the user of the Kindle device opens the book, the system will start keeping track, if the time spent on each page is enough for a person to read the text on it, the page will be counted and paid to the author.

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