Enhanced Electromagnetic Shielding Via Sequential Exfoliation of NbSe2 Thin Film: Structural and Electrical Optimization

초록

This study investigates the impact of sequential exfoliation on the structural, electrical, and electromagnetic interference (EMI) shielding properties of NbSe2 thin films. Sequential exfoliation yields two distinct films: the 1st, derived from the initial exfoliation, and the 2nd, obtained from further exfoliation of the residual material. Comparative analysis reveals that the 2nd film significantly enhanced total shielding effectiveness in the 8.2-12.4 GHz range, primarily due to its superior absorption shielding effectiveness. This enhancement is attributed to forming a highly uniform, laminated two-dimensional structure, which optimizes electrical conductivity and promotes effective electromagnetic wave dissipation through the skin effect. In contrast, the 1st film contains structural defects and residual oxides, which disrupt conductive pathways and reduce overall shielding efficiency. The denser morphology of the 2nd film facilitates repeated internal reflections, leading to greater energy absorption, whereas the irregular structure of the 1st film limits absorption efficiency.

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