Investigation on high EMI shielding effectiveness and shielding mechanism of spherical Ti3C2Tx microfilm prepared by spray-freezing.

Due to the explosive growth of the number of miniature electronic devices in the 5 G era, higher requirements have been raised for electromagnetic pollution protection materials. The production of effective electromagnetic (EM) interference (EMI) shielding materials is still challenging. In this research, Ti 3 C 2 T x microspheres were successfully synthesized by the self-developed spray freezing technology and 43 µm-thick spherical Ti 3 C 2 T x microfilm was prepared by vacuum filtration. The spherical film can block 5 G communication signals and its EMI shielding effectiveness (SE) is 51 dB, which is 50% higher than that of the 2D Ti 3 C 2 T x film of approximately the same thickness. Additionally, the effects of transmitting X-band EM waves through a 43 µm-thick spherical Ti 3 C 2 T x sheet were simulated employing Comsol Multiphsics. It is found that an annular current traveling perpendicular to the direction of electromagnetic wave propagation will be induced in the spherical Ti 3 C 2 T x , which leads an extra larger EM loss. This discovery provides a novel avenue for the structural design of EMI shielding materials. [Display omitted] • The spherical Ti 3 C 2 T x was synthesized through spray freezing for the first time. • The EMI SE of spherical Ti 3 C 2 T x film exceeds that of 2D Ti 3 C 2 T x film by 47%. • Circular current loss on Ti 3 C 2 T x microspheres was found by Comsol simulations. [ABSTRACT FROM AUTHOR]