Flexible, Ultralight, and Mechanically Robust Waterborne Polyurethane/Ti3C2Tx MXene/Nickel Ferrite Hybrid Aerogels for High-Performance Electromagnetic Interference Shielding

Wang, Yu; Qi, Qingbin; Yin, Guang; Wang, Wei; Yu, Dan

doi:10.1021/acsami.1c04962

Cited by 85 publications

(39 citation statements)

References 56 publications

(98 reference statements)

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“…Nickel ferrite (NiFe 2 O 4 ; NFO) is one of the metal-oxide-based soft magnetic materials owing to its high magnetization at low magnetic fields and low coercive force. , The physical, chemical, and electromagnetic properties of NFO and NFO-based composites are attractive for utilization in numerous scientific and technological applications. − Due to the intrinsic nature of NFO, it has been employed as a suitable active material in a wide range of applications, which include electronic memory, biomedical sensors and actuators, telecommunication, electromagnetic interference (EMI) shielding, catalysis, energy storage, and high-frequency electromagnetic devices. − The recent attention to the intrinsic and doped NFO materials is primarily due to the possibility of the design and development of their nanoscale architectures for utilization in electromagnetics, electrochemical energy storage and conversion technologies, and biomedical applications. − Additionally, using intrinsic or doped NFO in multilayered structures or in conjunction with polymers has been proposed to design highly efficient EMI shielding materials . For instance, the EMI absorber materials designed by means of a multilayer assembly of poly(vinylidene fluoride)-containing Zn-doped NFO have shown to increase the EMI shielding effectiveness dramatically .…”

Section: Introductionmentioning

confidence: 99%

Tunable Dielectric Properties of Nickel Ferrite Derived via Crystallographic Site Preferential Cation Substitution

et al. 2022

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We report on the tunable dielectric properties achieved in cation-substituted nickel ferrite (NiFe 2 O 4 ; NFO) by selectively engineering the crystallographic site occupation of the dopant cation in the NFO ceramics. The NFO, Mg-substituted NFO (NiMg 0.2 Fe 1.8 O 4 ; NMFO), and In-substituted NFO (NiIn 0.2 Fe 1.8 O 4 ; NIFO) nanocrystals were synthesized by employing a tartrate-gel chemical route, followed by calcination at 500 °C. High-resolution transmission electron microscopy (HRTEM) analyses indicate the crystal quality of NFO, NMFO, and NIFO nanomaterials. The HRTEM data revealed that all of the ferrite materials were nanocrystalline with sizes in the range of 15−25 nm. Coupled with HRTEM analyses, X-ray diffraction analyses indicate the formation of single-phase spinel-structured NFO, NMFO, and NIFO materials without any detectable impurities. Chemical analysis performed using Mossbauer spectroscopy indicates that Mg 2+ occupies the octahedral site, while In 3+ preferably occupies the tetrahedral site of the spinel-structured NFO. The Fourier transform infrared (FTIR) absorption bands corresponding to metal−oxygen (M−O) intrinsic stretching vibration in the octahedral unit (MO 6 ) and the tetrahedral unit (MO 4 ), respectively, were noted in all of the samples. However, the trend in the frequency shift of these bands in Mg-and In-substituted NFO materials is different due to the occupation of different sites of Mg and In as confirmed by Mossbauer studies. The electronic structure and chemical valence state analysis using X-ray photoelectron spectroscopy (XPS) corroborates with chemical bonding analyses performed by FTIR and cation distribution evaluation carried out by Mossbauer spectroscopy. The energy-dispersive X-ray spectrometry (EDS) data, in addition to XPS and FTIR analyses, further validate the formation of uniform and chemically homogeneous samples. The corresponding cation distribution revealed from Mossbauer studies correlates with the variation of dielectric properties of the doped NFO samples with respect to intrinsic NFO. At room temperature, the dielectric constant (ε) of NFO and NMFO is found to be nearly the same and constant over a wide range of frequencies. However, in NIFO, ε decreases with the applied frequency. The differences are attributed to the size effect and site preference of dopants (Mg 2+ and In 3+ ). Irrespective of the dopants, an increase in the temperature enhances the dielectric constant, which is due to an increase in the number of free charge carriers. A thermally activated electrical conduction mechanism was operative in NFO, NMFO, and NIFO materials. The activation energies for NFO, NFMO, and NIFO were 18.84, 34.48, and 57.14 meV, respectively. The enhanced dipolar effect of In 3+ at the tetrahedral site compared to Mg 2+ at the octahedral site may be the origin of the relatively higher value of activation energy in NIFO compared to intrinsic and Mg-substituted NFO.

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Section: Introductionmentioning

confidence: 99%

Tunable Dielectric Properties of Nickel Ferrite Derived via Crystallographic Site Preferential Cation Substitution

et al. 2022

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“…A suitable EMI shielding system was so suggested after the debate and is schematically shown in Figure a–c. Due to impedance mismatching, a portion was quickly reflected as EMW reached the composite films (Figure a). , Then, the MS in the films provided a conductive route for electron transfer and movement, which increased the conduction loss capability of the composites . Meanwhile, introduced abundant interfaces between the MS and WPU synergistically contributed to high interfacial polarization of incident EMW.…”

Section: Resultsmentioning

confidence: 99%

From MXene Trash to Ultraflexible Composites for Multifunctional Electromagnetic Interference Shielding

Liu

Zheng

et al. 2022

ACS Appl. Mater. Interfaces

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The development of flexible composites based on the transition metal carbides/nitrides (MXenes) is gaining popularity because of MXenes’ high application potentials for electromagnetic interference (EMI) shields. Here, we prepare a new type of ultraflexible composite films composed of “trashed” MXene sediment (MS) and waterborne polyurethane using a simple, facile solution casting approach. In addition to the outstanding mechanical strength and electrical conductivity, an extremely wide-range of MS contents can be achieved for the composites, resulting in EMI shielding effectiveness (SE) that may be controlled over a wide range. The X-band EMI SE of the flexible, low-density composites containing 70 wt % MS reaches 45.3 dB at a thickness of merely 0.51 mm. Moreover, the SE values of more than 34.5 dB in the ultrabroadband gigahertz frequency range including X-band, P-band, K-band, and R-band, are accomplished for the thin composites. Furthermore, the MS/WPU composite films show excellent electrothermal and photothermal performance, demonstrating the multifunctionalities of the MS-based EMI shields. Combined with the cost-efficient, sustainable, and scalable preparation approach, the ultraflexible, multifunctional composites from “trashed MXene” show great potentials for next-generation electronics. This work also opens a new avenue for the creation of innovative, high-performance, multifunctional flexible composites.

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“…Enhanced SE was attributed to the additional dipole polarization loss from the polydopamine. Furthermore, the surface modification of MXene flakes with low conductivity materials can also enhance the impedance matching and, subsequently, the EMW absorption by enhancing dipole and interfacial polarization losses. , For example, the EMI SE of MXene–poly(3,4-ethylene dioxythiophene)/poly(styrene sulfonate) (PEDOT/PSS) polymer composites was investigated. , Improved EMI SE of the composites was attributed to the multiple interface reflection and polarization between the MXene and PEDOT/PSS interfaces. Zhang et al prepared a brick-mud structure of the MXene–polyaniline (PA) composite and improved its EMI SE.…”

Section: Introductionmentioning

confidence: 99%

Greatly Enhanced Electromagnetic Interference Shielding Effectiveness and Mechanical Properties of Polyaniline-Grafted Ti₃C₂T_x MXene–PVDF Composites

Habibpour

Zarshenas

Zhang

et al. 2022

ACS Appl. Mater. Interfaces

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Nowadays, evolutions in wireless telecommunication industries, such as the emergence of complex 5G technology, occur together with massive development in portable electronics and wireless systems. This positive progress has come at the expense of significant electromagnetic interference (EMI) pollution, which requires the development of highly efficient shielding materials with low EM reflection. The manipulation of MXene surface functional groups and, subsequently, incorporation into engineered polymer matrices provide mechanisms to improve the electromechanical performance of conductive polymer composites (CPCs) and create a safe EM environment. Herein, Ti 3 C 2 T x MXene nanoflakes were first synthesized and then, taking advantage of their abundant surface functional groups, polyaniline (PA) nanofibers were grafted onto the MXene surface via oxidant-free oxidative polymerization at two different MXene to monomer ratios. The electrical conductivity, EMI shielding effectiveness (SE), and mechanical properties of poly (vinylidene fluoride) (PVDF)-based CPCs at different nanomaterial loadings were then thoroughly investigated. A very low percolation threshold of 1.8 vol % and outstanding electrical conductivities of 0.23, 0.195, and 0.17 S/cm were obtained at 6.9 vol % loading for PVDF−MXene, PVDF−MX 2 AN 1 , and PVDF−MX 1 AN 1 , respectively. Compared to the pristine MXene composite, surface modification significantly enhanced the EMI SE of the PVDF−MX 2 AN 1 and PVDF−MX 1 AN 1 composites by 19.6 and 32.7%, respectively. The remarkable EMI SE enhancement of the modified nanoflakes was attributed to (i) the intercalation of PA nanofibers between MXene layers, resulting in better nanoflake exfoliation, (ii) a large amount of dipole and interfacial polarization dissipation by constructing capacitor-like structures between nanoflakes and polymer chains, and (iii) augmented EMI attenuation via conducting PA nanofibers. The surface modification of the MXene nanoflakes also enhanced the interfacial interactions between PVDF chains and nanoflakes, which resulted in an improved Young's modulus of the PVDF matrix by about 67 and 46% at 6.9 vol % loading for PVDF−MX 2 AN 1 and PVDF−MX 1 AN 1 composites, respectively.

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Flexible, Ultralight, and Mechanically Robust Waterborne Polyurethane/Ti₃C₂T_x MXene/Nickel Ferrite Hybrid Aerogels for High-Performance Electromagnetic Interference Shielding

Cited by 85 publications

References 56 publications

Tunable Dielectric Properties of Nickel Ferrite Derived via Crystallographic Site Preferential Cation Substitution

Tunable Dielectric Properties of Nickel Ferrite Derived via Crystallographic Site Preferential Cation Substitution

From MXene Trash to Ultraflexible Composites for Multifunctional Electromagnetic Interference Shielding

Greatly Enhanced Electromagnetic Interference Shielding Effectiveness and Mechanical Properties of Polyaniline-Grafted Ti₃C₂T_x MXene–PVDF Composites

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Flexible, Ultralight, and Mechanically Robust Waterborne Polyurethane/Ti3C2Tx MXene/Nickel Ferrite Hybrid Aerogels for High-Performance Electromagnetic Interference Shielding

Cited by 85 publications

References 56 publications

Tunable Dielectric Properties of Nickel Ferrite Derived via Crystallographic Site Preferential Cation Substitution

Tunable Dielectric Properties of Nickel Ferrite Derived via Crystallographic Site Preferential Cation Substitution

From MXene Trash to Ultraflexible Composites for Multifunctional Electromagnetic Interference Shielding

Greatly Enhanced Electromagnetic Interference Shielding Effectiveness and Mechanical Properties of Polyaniline-Grafted Ti3C2Tx MXene–PVDF Composites

Contact Info

Product

Resources

About

Flexible, Ultralight, and Mechanically Robust Waterborne Polyurethane/Ti₃C₂T_x MXene/Nickel Ferrite Hybrid Aerogels for High-Performance Electromagnetic Interference Shielding

Greatly Enhanced Electromagnetic Interference Shielding Effectiveness and Mechanical Properties of Polyaniline-Grafted Ti₃C₂T_x MXene–PVDF Composites