Enhanced dielectric and electrostatic energy density of electronic conductive organic-metal oxide frameworks at ultra-high frequency
2022
Palsaniya, Shatrudhan | Mukherji, Soumyo
High-density energy materials comprise high dielectric strength, and rapid charge transport leads to improved microwave absorbance, maximum electromagnetic wave (EM) attenuation, and wideband characteristics. This work exhibits hierarchical polyaniline (PANI) functionalized polycrystalline hybrid units. Comprehensive band structures, increased electron conduction, high charge polarization, and definite EM wave absorption could be tuned by the featured morphologies. Filler material's (RGO/ZnO) intercalated structures have substantial free space volume. It could facilitate notable dielectric permittivity (∼2562 F m⁻¹), give rise to higher charge polarization and excellent charge storage performance (∼112 F). This electrostatic charge proficiency could recognize with generous electron density corresponding to stimulated surface charge density (σs, ∼8.66×103 C m⁻²). Quality factor (Q) of 0.056 (∼ 7.1×106Hz) with minimized losses attributed to higher energy density (Uₑ, ∼1530 J cm⁻³) at low electric field strength ∼ 450 V m⁻¹, which could resemble a variable Uₑ performance at lower to a higher percolation threshold voltage. Incorporated ZnO and RGO nanostructures are well organized, with the PANI matrix providing good interfacial adhesion. It significantly raises the EM wave losses (– 28 dB) of ∼0.300 mm thick specimen at ∼ 18.42 GHz. We envisioned that the multifunctional response of the PANI-RGO-ZnO 2:1 hybrid might manifest potential energy storage and microwave absorption as electrode materials that may be useful in solid-state devices used in modern communication systems.
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