Robust, transparent, and conductive AgNW/MXene composite polyurethane self-healing film for electromagnetic interference shielding

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Abstract

This work reported a robust, transparent, and conductive AgNW/MXene composite polyurethane self-healing film, which exhibited ultra-low sheet resistance, high transmittance and good EMI shielding effectiveness.

Abstract

Electromagnetic interference (EMI) pollution poses risks to electronic devices and human health and has emerged as a major source of pollution. In addition to being low in weight and exhibiting high transparency, flexibility, and easy processability, the polymer-based transparent conductive films (TCFs) increasingly used for EMI shielding exhibit fragility, and scratches in TCFs during service usually cause severe electromagnetic wave leakage and waste. To address this issue, we designed a DMBA-modified oxime-carbamate polyurethane film with remarkable mechanical strength, high transmittance, and self-healing efficiency and prepared TCFs by uniformly depositing AgNWs and Ti ₃C ₂T _x MXene on the material surface. The TCFs show an ultra-low sheet resistance (18 Ω sq ⁻¹), high transmittance (82.8%), good EMI shielding effectiveness (SE, 27.1 dB), and excellent retention of properties after 1000 flexures and rapid recovery after three cutoff/self-repair cycles, demonstrating resistance against damage. The novel TCFs exhibit great potential for application in consumer electronics, radio communications, and radar stealth.

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25th anniversary article: MXenes: a new family of two-dimensional materials.

Michael Naguib, Vadym N. Mochalin, Michel W. Barsoum … (2014)

Recently a new, large family of two-dimensional (2D) early transition metal carbides and carbonitrides, called MXenes, was discovered. MXenes are produced by selective etching of the A element from the MAX phases, which are metallically conductive, layered solids connected by strong metallic, ionic, and covalent bonds, such as Ti2 AlC, Ti3 AlC2 , and Ta4 AlC3 . MXenes -combine the metallic conductivity of transition metal carbides with the hydrophilic nature of their hydroxyl or oxygen terminated surfaces. In essence, they behave as "conductive clays". This article reviews progress-both -experimental and theoretical-on their synthesis, structure, properties, intercalation, delamination, and potential applications. MXenes are expected to be good candidates for a host of applications. They have already shown promising performance in electrochemical energy storage systems. A detailed outlook for future research on MXenes is also presented.

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Electromagnetic interference shielding with 2D transition metal carbides (MXenes)

F. Shahzad, M. Alhabeb, C. Hatter … (2016)

Materials with good flexibility and high conductivity that can provide electromagnetic interference (EMI) shielding with minimal thickness are highly desirable, especially if they can be easily processed into films. Two-dimensional metal carbides and nitrides, known as MXenes, combine metallic conductivity and hydrophilic surfaces. Here, we demonstrate the potential of several MXenes and their polymer composites for EMI shielding. A 45-micrometer-thick Ti3C2Tx film exhibited EMI shielding effectiveness of 92 decibels (>50 decibels for a 2.5-micrometer film), which is the highest among synthetic materials of comparable thickness produced to date. This performance originates from the excellent electrical conductivity of Ti3C2Tx films (4600 Siemens per centimeter) and multiple internal reflections from Ti3C2Tx flakes in free-standing films. The mechanical flexibility and easy coating capability offered by MXenes and their composites enable them to shield surfaces of any shape while providing high EMI shielding efficiency.

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Anomalous collapses of Nares Strait ice arches leads to enhanced export of Arctic sea ice

G. Moore, S. Howell, M. Brady … (2021)

The ice arches that usually develop at the northern and southern ends of Nares Strait play an important role in modulating the export of Arctic Ocean multi-year sea ice. The Arctic Ocean is evolving towards an ice pack that is younger, thinner, and more mobile and the fate of its multi-year ice is becoming of increasing interest. Here, we use sea ice motion retrievals from Sentinel-1 imagery to report on the recent behavior of these ice arches and the associated ice fluxes. We show that the duration of arch formation has decreased over the past 20 years, while the ice area and volume fluxes along Nares Strait have both increased. These results suggest that a transition is underway towards a state where the formation of these arches will become atypical with a concomitant increase in the export of multi-year ice accelerating the transition towards a younger and thinner Arctic ice pack.

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Author and article information

Contributors

Jiaqi Zhu: (View ORCID Profile)

Journal

Journal ID (publisher-id): JMCCCX

Title: Journal of Materials Chemistry C

Abbreviated Title: J. Mater. Chem. C

Publisher: Royal Society of Chemistry (RSC)

ISSN (Print): 2050-7526

ISSN (Electronic): 2050-7534

Publication date Created: November 24 2022

Publication date (Electronic): 2022

Volume: 10

Issue: 45

Pages: 17066-17074

Affiliations

[1 ]National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150080, China

[2 ]Department of Materials Science and Engineering, College of Mechanics and Materials, Hohai University, Nanjing 211100, China

[3 ]Research Center of Analysis and Measurement, Harbin Institute of Technology, Harbin 150001, China

[4 ]Key Laboratory of Micro-systems and Micro-structures Manufacturing, Ministry of Education, China

Article

DOI: 10.1039/D2TC03822F

SO-VID: 313db40b-a79a-45c2-a73c-a8e6317b24d6

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http://rsc.li/journals-terms-of-use

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