Highly Efficient and Reliable Transparent Electromagnetic Interference Shielding Film

Jia, Li‐Chuan; Yan, Ding‐Xiang; Liu, Xiaofeng; Ma, Rujun; Wu, Hongyuan; Li, Zhong‐Ming

doi:10.1021/acsami.8b00492

Cited by 248 publications

(187 citation statements)

References 74 publications

(116 reference statements)

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“…[4][5][6][7][8] Tremendous efforts have been committed to achieving transparent EMI shielding using a number of strategies and a variety of materials, including transparent conductive oxide, ultra-thin metal lms, various shapes of metal grids with micro periods, bandpass frequency selective surface, silver nanowire, graphene and other carbon-based materials. [9][10][11][12][13][14] Among them, indium tin oxide (ITO) is currently used in transparent coating, exhibiting excellent visible light transmittance and strong electromagnetic shielding efficiency. However, ITO has high production cost, poor ultraviolet and infrared transmission that limit its development in window.…”

Section: Introductionmentioning

confidence: 99%

Double-layer metal mesh etched by femtosecond laser for high-performance electromagnetic interference shielding window

Zhang

Dong

et al. 2019

RSC Adv.

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An excellent transparent electromagnetic interference (EMI) shielding window is proposed and demonstrated theoretically and experimentally. The window is composed of double layers of Au-Ni composite mesh, separated by the quartz-glass substrate. The simulation exhibits that the shielding effectiveness (SE) of the double-layer mesh can be improved by increasing the thickness of the substrate in the low frequency range far below the first interfere valley. The measured SE of the proposed structure reaches over 37.61 dB covering an ultra-wide frequency ranging from 150 MHz to 5 GHz, with a maximal SE of 75.84 dB at 3.58 GHz, while the average optical transmittance of the double-layer mesh maintains $76.35% at 400-900 nm. Moreover, femtosecond laser direct writing processing technology is used to manufacture the double-layer metal grids, the fabricated grids are not easy to be scuffed off and has a longer operating life. Such a high-performance EMI shielding window has great potential applications in precision optical monitoring instrument and military devices. Fig. 1 Schematic diagram (a) of the optical window, and detailed structure (b) of the square metal mesh.This journal is

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Section: Introductionmentioning

confidence: 99%

Double-layer metal mesh etched by femtosecond laser for high-performance electromagnetic interference shielding window

Zhang

Dong

et al. 2019

RSC Adv.

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“…By further increasing the thickness of metal grids, the EMI SE value can be improved, and over 50 dB EMI SE at 10 GHz is obtained when the copper layer thickness is 2 µm as a result of the improved conductivity derived from increased copper thickness ( Figure S6a-c, Supporting Information), however with great loss of light transmission for our laser ablation method due to unclean polymer surface with residual copper. In our conductive film case, because the thickness of conductive layer is far less than skin depth of electromagnetic wave (d ≪ δ), the following formula can be given, [55,57,58] Z R s EMI SE 20 log 1 2…”

Section: Resultsmentioning

confidence: 99%

Flexible Fabrication of Flexible Electronics: A General Laser Ablation Strategy for Robust Large‐Area Copper‐Based Electronics

Qin

Zhang

et al. 2019

Adv Elect Materials

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toward flexibility, intelligence, and high integration, and the materials with good photoelectric performance, excellent processibility, low cost, good reliability, and chemical stability are highly desirable.Compared with traditional rigid devices, flexible electronics can adapt to different working environments and meet the requirements of various deformations while maintaining the normal functions of electronic devices. In flexible photoelectric devices, the flexible transparent conducting electrodes (FTCEs) are an indispensable part, and currently the most widely used FTCE is indium tin oxide (ITO)-coated transparent plastic film. However, ITO coated film has the following shortcomings: high cost of indium, large material waste in the production process, the requirement of expensive highvacuum equipment, and the most important one-intrinsic brittleness of ITO, which is incompatible with the future lowcost wearable flexible electronic devices. [13] In order to develop inexpensive and reliable alternatives of ITO, many novel materials and fabrication methods have been put forward. Metal nanowires (NWs) are considered to be the most promising alternatives of ITO for fabricating high-performance FTCEs. [13] Recently, silver nanowires mesh structures have been widely employed as conductive layer on flexible transparent substrate, and superior light transmission and conductivity have been obtained. More importantly the performance degradation of Attributed to high power density and controllable digital program operation, lasers are a powerful tool in the preparation, prototype fabrication, and post-processing of materials. In this paper, a general laser ablation strategy that can be conducted under ambient, room-temperature, and mask-free conditions is employed for the rapid fabrication of robust large-area copperbased flexible electronics. Micrometer-scale thick copper layer cladded on flexible polymer substrate can be removed efficiently in one laser scanning pass based on laser-induced heat evaporation effect. Metal grids with a width less than 10 microns and a thickness close to 2 microns can be produced in a reliable manner. As proof-of-concept demonstrations, flexible transparent conducting electrodes and a variety of flexible circuit boards (FCBs) with different precisions and dimensions are fabricated by this approach in a digitally controlled mode and their photoelectric properties under normal and deformation states are investigated. The results indicate that the method is robust and asprepared flexible electrodes and circuits are reliable and endurable, indicative of the potential of this method in scalable fabrication of sub-millimeter flexible electronics through a straightforward and flexible fashion.

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“…Yan et al. designed various conductive polymer composites with typical segregated structure, in which CNTs, graphene, and silver nanowires being used as fillers, and rubber, polypropylene, polylactic acid as polymer matrix . The common feature of these composites is that the conductive nanofillers were selectively distributed at the interface between the polymer substrates.…”

Section: Introductionmentioning

confidence: 99%

“…[34,35] Yan et al designed various conductive polymer composites with typical segregated structure, in which CNTs, graphene, and silver nanowires being used as fillers, and rubber, polypropylene, polylactic acid as polymer matrix. [35][36][37][38][39] The common feature of these composites is that the conductive nanofillers were selectively distributed at the interface between the polymer substrates. This segregated structure can construct a high-density 3D cross-linked conductive network in the polymer matrix, thereby making the materials have good conductivity and high EMI SE.…”

Section: Introductionmentioning

confidence: 99%

High Electromagnetic Interference Shielding Effectiveness of Carbon Nanotube–Cellulose Composite Films with Layered Structures

Xing

Qin

Liu

et al. 2018

Macro Materials & Eng

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Flexible and electrically conductive carbon nanotube (CNT)–cellulose composite films are fabricated by a green route based on sodium hydroxide/urea aqueous solution. Both single‐walled carbon nanotubes (SWCNTs) and multi‐walled carbon nanotubes (MWCNTs) are investigated as conductive fillers. The microstructure and physical properties of the films are characterized extensively. It is observed that CNTs form layered conductive networks in the cellulose matrices during the drying process. The electromagnetic interference (EMI) shielding effectiveness (SE) of these composite films is also investigated. The results exhibit that the EMI SE of the materials is in accordance with electrical conductivity, which is highly dependent on the CNT loadings. Compared to MWCNT–cellulose composite films, the films with SWCNT show more effectiveness as EMI materials in the frequency range of 12–18 GHz. With SWCNT loading of 10 wt%, the EMI SE can reach 32.5–40 dB. Considering the thickness and density of the material, furthermore, the SWCNT–cellulose film possesses an extremely high specific EMI SE value of about 7678 dB cm2 g−1, which is due to the unique layered structures of CNTs. Thus, these flexible conductive composite films have the potential to be used as high‐efficiency shielding materials against electromagnetic radiation in advanced application fields.

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Highly Efficient and Reliable Transparent Electromagnetic Interference Shielding Film

Cited by 248 publications

References 74 publications

Double-layer metal mesh etched by femtosecond laser for high-performance electromagnetic interference shielding window

Double-layer metal mesh etched by femtosecond laser for high-performance electromagnetic interference shielding window

Flexible Fabrication of Flexible Electronics: A General Laser Ablation Strategy for Robust Large‐Area Copper‐Based Electronics

High Electromagnetic Interference Shielding Effectiveness of Carbon Nanotube–Cellulose Composite Films with Layered Structures

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