Ultrahigh Permittivity of Surface-State-Dominated Bi₂Te₃ Nanosheets for Low-Frequency Microwave Absorption.

ABSTRACT: Low-frequency microwave absorption poses an important challenge due to the excessive thickness of absorbers, which inherently correlates with wavelength. Herein, Bi₂Te₃ nanosheets were synthesized via a solvothermal method to achieve high permittivity, aiming to address the issue of low-frequency microwave absorption. The as-prepared nanosheets demonstrate a tunable ultra-high permittivity (up to 282) at 2 GHz, accompanied by a loss tangent below 0.81 and pronounced frequency dispersion characteristics. The nanosheet material demonstrates a synergistic balance of ultrahigh permittivity and appropriate dielectric loss, attributed to its surface-state-conducting and bulk-insulating character. At 2.4 GHz, the composite material composed of Bi₂Te₃ na

SUBMITTER: Li D 

PROVIDER: S-EPMC12541145 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature