Functional nanoporous graphene superlattice

Abstract

Two-dimensional (2D) superlattices, formed by stacking sublattices of 2D materials, have emerged as a powerful platform for tailoring and enhancing material properties beyond their intrinsic characteristics. However, conventional synthesis methods are limited to pristine 2D material sublattices, posing a significant practical challenge when it comes to stacking chemically modified sublattices. Here we report a chemical synthesis method that overcomes this challenge by creating a unique 2D graphene superlattice, stacking graphene sublattices with monodisperse, nanometer-sized, square-shaped pores and strategically doped elements at the pore edges. The resulting graphene superlattice exhibits remarkable correlations between quantum phases at both the electron and phonon levels, leading to diverse functionalities, such as electromagnetic shielding, energy harvesting, optoelectronics, and thermoelectrics. Overall, our findings not only provide chemical design principles for synthesizing and understanding functional 2D superlattices but also expand their enhanced functionality and extensive application potential compared to their pristine counterparts.

Ultralight Hierarchical Fe3O4/MoS2/rGO/Ti3C2Tx MXene Composite Aerogels for High-Efficiency Electromagnetic Wave Absorption

“…To reveal the EM wave-absorption behavior and mechanism of the composite aerogel, the relevant electromagnetic parameters for FMGM-X and GM were further analyzed. Generally, the real and imaginary parts of complex permittivity ( ε′ and ε″ ) correspond to the energy storage and dissipation capacities in electric fields, respectively. − Figure a shows the ε′ curves for samples across the frequency from 2 to 18 GHz. It can be found that an increase in Fe 3 O 4 /MoS 2 concentration significantly reduces the ε′ values of the aerogel, which can be ascribed to the decreased proportion of carbon materials.…”