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New use of 2D titanium carbide (MXene)-wireless communication

wallpapers News 2021-11-24
New use of 2D titanium carbide (MXene)-wireless communication
With the development of the Internet of Things (IoT), the demand for thin wearable electronic devices is growing rapidly. The key part of the Internet of Things is the communication between devices, which requires radio frequency (RF) antennas to achieve. The metal materials widely used in antennas cannot meet the requirements for preparing thin, light, and flexible antennas because of their property limitations. To meet the requirements of wearable device antennas, materials must be easy to process, and they can be coated in conductive films. At present, materials such as conductive polymers or metal nanomaterials and carbon nanomaterials have been explored. However, the mechanism research of these materials is still not clear enough, and the conductivity of these carbon nanomaterials is relatively low. The 2D titanium carbide MXene film has a high conductivity of 5000 to 10,000 S/cm, which exceeds other 2D materials and is the best candidate for antenna manufacturing.
Ti3C2 film and its composite materials show electromagnetic interference (EMI) shielding capabilities comparable to metals and are superior to other nanomaterials of similar thickness.
The aqueous solution of Ti3C2 flake colloid can be filtered, sprayed, printed, or spin-coated to produce thin films. In this paper, the spraying technology can prepare thin films with a thickness of less than 1.4μm, and the vacuum-assisted filtration technology can prepare thin films with a thickness of more than 1μm. Vacuum treatment at 150°C to remove the water in the middle layer can improve the sheet arrangement, reduce the layer spacing, and increase the conductivity of the MXene film.
Ti3C2 straight dipole antenna is easy to manufacture and is ideal for researching MXene antenna. The author designed and prepared a 2.4GHz MXene dipole for Wi-Fi and Bluetooth. To quantify the antenna performance, the author studied the return loss and the antenna's radiation characteristics. The thickness of Ti3C2 ranges from 114nm to 8μm. The MXene antenna shows good impedance matching, with peak return loss ranging from -12 to -65dB (usually peak return loss below -10dB is considered satisfactory impedance matching). Through electrodynamic simulation (CSTMicrowave Studio), a good match of all thicknesses was observed.
The gain comparison technique is used to quantify the effective power radiated from the MXene dipole antenna. The 1.4-micron thick MXene antenna shows a gain of 1.7dB. Simulation experiments show that at a thickness of 8μm, the maximum gain of the MXene antenna is 2.11dB, which is close to the maximum gain (2.15dB) of an ideal half-wavelength dipole antenna.
To quantify the loss of the conductive material itself, electromagnetic wave propagation in MXene TL was studied. The commonly used parameter for estimating loss in TL is attenuation.
S11 and S21 represent reflection and transmission coefficients, respectively. The attenuation rate is a quality factor that has nothing to do with the actual sample length, which can characterize the material properties in the microwave region.
The Ti3C2 MXene TL was fabricated using the same MXene film used for the dipole antenna with a film thickness of 62 nm to 8 μm. The study found that the attenuation rate increased with the decrease of the TL film thickness. Bending and normal mode tests show that MXeneTL has excellent flexibility, making MXene an ideal choice for flexible and wearable wireless communication devices.

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