Building the conformal protection of VB-group VS 2 laminated heterostructure based on biomass-derived carbon for excellent broadband electromagnetic waves absorption

Abstract

Although VB-Group transition metal disulfides (TMDs) VS2 nanomaterials with specific electronic properties and multiphase microstructures have shown fascinating potential in the field of electromagnetic wave (EMW) absorption, the efficient utilization of VS2 is limited by their environmental instability and sole electromagnetic (EM) loss mechanism. In order to fully exploit the maximal utilization values of VS2 nanomaterials for EMW absorption through mitigating the chemical instability and optimizing the EM parameters, biomass-based glucose derived carbon (GDC) like sugar-coating has been decorated on the surface of stacked VS2 nanosheets via a facile hydrothermal method, followed by high-temperature carbonization. As a result, the modulation of doping amount of glucose injection solution (Glucose) could effectively manipulate the degree of GDC coating on VS2 nanosheets, further implementing the EM response mechanisms of the VS2/GDC hybrids through regulating the conductivity and constructing multi-interface heterostructures, as reflected by the enhanced EMW absorption performance to a great extent. The minimum reflection loss of VS2/GDC hybrids could reach -52.8 dB with a thickness of 2.7 mm at 12.2 GHz. Surprisingly, compared with pristine VS2, the VS2/GDC hybrids have the effective absorption bandwidth (EAB) increased from 2.0 to 5.7 GHz, while their environmental stability is much enhanced because of GDC. Obviously, this work provides a promising candidate to realize frequency band tunability of EMW absorbers with exceptional performance and environmental stability.