Enhanced dielectric properties of homogeneous Ti3C2Tx MXene@SiO2/polyvinyl alcohol composite films

Wan, Wei; Meizhen, Tao; Cao, Hailin; Zhao, Yuqing; Luo, Jiawen; Yang, Jian; Qiu, Tai

doi:10.1016/j.ceramint.2020.02.179

Cited by 50 publications

(14 citation statements)

References 42 publications

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“…The flux density and the polarization centers are increased as the MXene content (1–15 phr) increases because of the laminate architecture of 2D flakes of MXene. Henceforth, with the increasing MXene amount, the EM wave dissipation and heat dissipation are more prominent . The real and imaginary parts of the permittivity and dielectric loss factor values of all the zinc oxide cross-linked API-XNBR/MXene composites are given below. ε ′ prefix= 9.23 0.25em to 0.25em 8.63 0.25em ( XAZM 1 ) ; 17.54 0.25em to 0.25em 14.36 0.25em ( XAZM 3 ) ; 34.76.64 0.25em to 0.25em 30.64 0.25em ( XAZM 5 ) ; 48.95 0.25em to 0.25em 43.84 0.25em ( XAZM 10 ) ; 55.64 0.25em to 0.25em 48.75 0.25em ( XAZM 15 ) ε ″ prefix= 1.15 0.25em to 0.25em 0.02 0.25em ( XPZM 1 ) ; 4.78 0.25em to 0.25em 1.77 0.25em ( XPZM 3 ) ; 16.14 0.25em to 0.25em 12.34 0.25em ( XPZM 5 ) ; 26.78 0.25em…”

Section: Resultsmentioning

confidence: 99%

“…The tan δ (dielectric loss factor) value takes a Henceforth, with the increasing MXene amount, the EM wave dissipation and heat dissipation are more prominent. 64 The real and imaginary parts of the permittivity and dielectric loss factor values of all the zinc oxide crosslinked API-XNBR/MXene composites are given below. To further explore the hands-on implementation (Figure 5h), an observation was organized utilizing two 4G Redmi mobile phones.…”

Section: Emi Shielding Performance and The Calculations Of Dielectric...mentioning

confidence: 99%

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Super-Stretchable, Self-Healing 2D MXene-Based Composites for Thermal Management and Electromagnetic Shielding Applications

Das

Katheria

Jana

et al. 2023

ACS Appl. Eng. Mater.

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MXene-based elastomeric electromagnetic radiation shielding composites are encouraging aspirants to ensure the secure performance of stretchable and wearable electronic gadgets. However, it is a tough challenge to construct effective stretchable elastomer/MXene composites with outstanding electromagnetic radiation shielding efficiency, healing capability, thermal management, and recyclability. To simultaneously promote the multifunctional characteristics of the elastomeric composites, we prepared zinc oxide cross-linked and 1-(3-aminopropyl) imidazole (API)-grafted XNBR/MXene composites by forming continuous conductive nacre-like network via a simple two-step wet cum melt mixing strategy. Contributed by the structure, the composites show excellent shielding effectiveness of −27.4 dB (in the frequency range of 8.2−12.4 GHz) and a thermal conductivity of 1.24 W/mK while retaining the electrical conductivity of 0.5 S/cm, room temperature self-healing ability of 46.8%, and 100% recyclability with desirable stretchability and mechanical strength. Notably, the continuous conducting network remains unaffected even after reprocessing, stretching, bending, extended sunlight exposure, and chemical treatment, which validates its all-round chemical and mechanical performance. Such prolonged deformations show more than 95% retention of shielding effectiveness. Collectively, our multifunctional elastomeric composites supply a prominent directive for the establishment of high-performance elastomeric composites with outstanding shielding efficiency, self-healing ability, thermal management, recyclability, and excellent mechanical behavior.

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Section: Resultsmentioning

confidence: 99%

Section: Emi Shielding Performance and The Calculations Of Dielectric...mentioning

confidence: 99%

Super-Stretchable, Self-Healing 2D MXene-Based Composites for Thermal Management and Electromagnetic Shielding Applications

Das

Katheria

Jana

et al. 2023

ACS Appl. Eng. Mater.

View full text Add to dashboard Cite

show abstract

“…Adding 1D and 2D conductive nanomaterials (e.g., nanotube, reduced graphene oxide (rGO) and MXene) is an effective method that can greatly increase the dielectric constant. − But those conductive additions will increase the relaxation time due to the charge movement of conductive filler is a long-range movement, charges can not match up with the electric field at high frequency, causing a serious dielectric relaxation at high frequencies (>1 × 10 5 Hz). The more you add, the more it will shift toward lower frequencies; only a small value for the dielectric constant remains after dielectric relaxation. − As stretchable/wearable flexible electronics advance, high-frequency (MHz) performances of the soft devices are needed to help them meet the requirements of wireless communication and remote monitoring . However, at present, the study of polymer-based high dielectric composites filled with conductive nanomaterials still focuses on the early stage of how to reduce the dielectric loss and increase the dielectric constant and breakdown strength. ,, To the best of the authors’ knowledge, still nothing has been reported about improving the dielectric constant of polymer-based dielectric composites at high frequencies.…”

Section: Introductionmentioning

confidence: 99%

Reduced Graphene Oxide-Based Dielectric Nanocomposites with Small Dielectric Relaxation Times for Emerging Dielectric Electronics with High-Frequency Performance Demands

Liu

Wang

Peng

et al. 2022

ACS Appl. Nano Mater.

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To meet the demand of emerging devices for highfrequency dielectric performances, we proposed semiconductor polyaniline in situ modified rGO nanosheets to keep the dielectric constant stable at high frequencies. The π−π interface interaction between rGO and semiconductor polyaniline was found to block the migration of electrons, redistributing the delocalized electrons of rGO and leading to a reduction in relaxation time and a delay in the dielectric relaxation at higher frequencies. This mechanism gave the dielectric materials a stable dielectric constant at high frequencies. The dielectric relaxation time was reduced from 2.75 × 10 −8 to 5.68 × 10 −10 at a filler load of 10 wt %. The dielectric constant only decreased by 19% from 100 to 1 × 10 8 Hz. For the same range, unmodified rGO showed an 85% decrease. This mechanism could also further increase the dielectric constant and decrease the dielectric loss. This has a great potential for emerging high-frequency devices (DC/DC converter, sensors, energy harvesters, etc.).

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“…It is found to be a major host material for metal nanoparticle encapsulation [15] . Although most polymers are incredibly customizable, their extremely low dielectric constant value limits their practical uses for various applications in electronic systems [16] . It is well known that nanoparticles can easily disperse within a PVA matrix.…”

Section: Introductionmentioning

confidence: 99%

Biosynthesized Silver Nanoparticles Encapsulated in a Poly(vinyl alcohol) Matrix: Dielectric and Structural Properties

et al. 2022

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In the present investigation, silver (Ag) nanoparticles were prepared employing green synthesis from the aqueous leaves extract of Cyperus rotundus (CR) plant at ambient temperature in less reaction time. A preliminary phytochemical analysis test was performed, and it has been revealed that the extract comprised bioactive components such as alkaloids, phenols, and terpenoids, among others. For average size, the morphology (spherical shape) and purity of the nanoparticles were characterized using scanning electron microscopy (SEM, 358 nm) with energy-dispersive X-ray (EDX), dynamic light scattering (27 nm), high-resolution transmission electron microscopy (3.9 nm), and selected area electron diffraction (SAED) pattern methods. Without any extra peaks in the EDX spectrum, the produced Ag nanoparticles were confirmed to be pure. In addition, the solvent-casting approach has been used to encapsulate a different weight fraction of biosynthesized Ag nanoparticles (CRÀ AgÀ NPs) in a polyvinyl alcohol (PVA) matrix. By using UV-visible, FTIR spectroscopy, and SEM, we were able to characterize the synthesized CRÀ AgÀ NPs as well as their composite (PVA) films, and we were able to compare the results with those of pristine PVA. The effects of doping with CRÀ AgÀ NPs on structural and morphological changes of PVA were studied. Impedance studies, including dielectric constant, dielectric loss, tangent loss, and AC conductivity, revealed that incorporating CRÀ AgÀ NPs into the PVA matrix impacts the electrical properties of PVA. This study showed that the synthesized nanoparticles had a spherical shape with entangled biocomponents and were encapsulated within the PVA polymer matrix, indicating that CRÀ AgÀ NPs can be used in various applications (wound healing).

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Enhanced dielectric properties of homogeneous Ti3C2Tx MXene@SiO2/polyvinyl alcohol composite films

Cited by 50 publications

References 42 publications

Super-Stretchable, Self-Healing 2D MXene-Based Composites for Thermal Management and Electromagnetic Shielding Applications

Super-Stretchable, Self-Healing 2D MXene-Based Composites for Thermal Management and Electromagnetic Shielding Applications

Reduced Graphene Oxide-Based Dielectric Nanocomposites with Small Dielectric Relaxation Times for Emerging Dielectric Electronics with High-Frequency Performance Demands

Biosynthesized Silver Nanoparticles Encapsulated in a Poly(vinyl alcohol) Matrix: Dielectric and Structural Properties

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