Re-estimation of Maxwell-Wagner relaxation for novel absorbers via (Ta+Ga)-doped rutile-type TiO2 ceramics with various valence proportions and sintering temperatures

Kuwano, Taro; Hashimoto, Yujiro; Deguchi, K.; Taniguchi, Hiroki

doi:10.1016/j.jallcom.2023.171624

Cited by 1 publication

(1 citation statement)

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“…These dielectric properties, determined by the permittivity, vary depending on the desired application and the material’s ability to respond to electric fields. − Before Veselago proposed the theoretical possibility of negative refraction, almost all previous investigations concentrated on the positive permittivity while giving the negative permittivity less attention . Epsilon-negative materials have been shown to have a wide range of potential applications, including coil-free resonators, novel capacitors with high permittivity, negative capacitance field effect transistors, and high-power microwave filters …”

Section: Introductionmentioning

confidence: 99%

Flexible MWCNT/PVA/Mn Ferrite/AC Metacomposites with Tunable Negative Permittivity for Low-Frequency Reflectors and Optical Sensors

Gholipur,

Maazi

2023

ACS Appl. Nano Mater.

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With the development of new metamaterials made of periodic array structures, negative permittivity has recently received more and more attention. However, it is crucial to achieve negative permittivity behavior based on materials' intrinsic properties rather than their synthetically periodic structures, as easy preparation is always a priority. Wearable cloaks, stretchable sensors, thin-film capacitors, and other applications all hold great promise for flexible metacomposites with tunable negative permittivity. Herein, flexible multi-walled carbon nanotube/poly(vinyl alcohol)/manganese ferrite/active carbon (MWCNT/PVA/Mn ferrite/AC) porous metacomposites with negative dielectric constant were prepared by feasible sol−gel method. The resulting metacomposites with various MWCNT mass values were examined for their ac conductivity behavior, magnetic and dielectric characteristics, impedance, and absorbance performances. The findings indicate that these novel amorphous metacomposites possess exceptional qualities, such as superior impedance matching, magnetic characteristics, exceptional reflectivity, and proficiency as an optical sensor, alongside their negative dielectric constant.

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