JOURNAL OF MATERIALS SCIENCE
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2025
·
IF 3.9
Luo Yang,Guo Huangying,Wan Wenyu,Deng Pengcheng,Zhang Haiwei,Zhou Xing
With the development of information technology, electromagnetic pollution has become a new source of pollution. Efficient EMI shielding materials are urgently needed to deal with this problem, and conductivity is the key to achieving efficient shielding. Impedance mismatch makes the composite shielding material obtain electromagnetic wave reflection dissipation ability, but excessive reflection loss will lead to secondary pollution of the environment. In this paper, polyaniline-modified graphene nanosheets (GNS@PANI) were used as conductive fillers, and tin oxide-coated ferric oxide (Fe 3 O 4 @SnO 2 ) with a shell–core structure was added to self-healing polyurethane (PU) as a magnetic conductive filler. The magnetic nanofiller with high permeability was used to improve the absorbing ability of the composite shielding material. When the addition amount of Fe 3 O 4 @SnO 2 is only 7 wt%, the composite film exhibits a high tensile strength of 5.22 MPa and an ultra-high self-healing efficiency of 89.66%, and the maximum EMI SE can reach 29 dB. Meanwhile, the SE A in the EMI SE is as high as 17 dB, and the SE R is only 12 dB, which is much lower than the SE A . To further enhance the electromagnetic wave absorption loss, we prepared a “sandwich” structure layered fabric using layer-by-layer assembly technology. This composite film has excellent electromagnetic absorption loss ability and has broad application prospects in the fields of medical devices, communication networks and flexible wearable electronics. Graphical abstract
研究领域:
材料科学
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电磁兼容性
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纳米技术
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聚合物复合材料
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柔性电子
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产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2019
·Vol. 48
·期 5
·2745-2753
·
IF 1.676
Zhan Haijiao,Guo Jiayu,Shen Jiali,Wang Xiaorong,Fan Zhonghua,Guo Bing,Liu Wei,Shen Hangyan
Silver microparticles have inspired much research interest due to their enhanced properties for use in optical, electric, catalytic, and magnetic applications. One such use is as electrically conductive filler for printed electronics. A manufacturing approach has been developed to prepare low-curing-temperature silver pastes. Firstly, silver flakes were synthesized directly by a one-step aqueous-phase reduction reaction, using silver nitrate as silver salt precursor and iron(II) sulfate heptahydrate as reducing agent. Various silver flake samples were synthesized by controlling experimental parameters such as the reaction temperature, surfactant concentration, and reducing agent concentration. The obtained silver powders were characterized by x-ray diffraction analysis, scanning electron microscopy, and dynamic light scattering measurements. The results revealed that the morphology of the silver powders was a plate-like structure with diameter of 1 μ m to 1.5 μ m and thickness of 30 nm. The prepared silver flakes were then used directly without ball milling to prepare low-curing-temperature silver pastes. The bulk resistivity of a line screen-printed using silver paste containing 48 wt.% (34 ± 5 vol.%) silver flakes and cured at 140°C for 30 min in air was about (1.773 ± 0.118) × 10 −6 Ω m. More importantly, the prepared screen-printed patterns exhibited excellent durability in terms of peel strength and folding endurance.
研究领域:
材料科学
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纳米技术
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电子工程
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应用化学
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先进制造
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 32
·1-13
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IF 2.8
Tang Guohui,Ren Qian,Chen Zheng,Ding Zixuan,Zhu Changtian,Chen Jin,Xu Gaojie,Liu Fenghua
In this study, an economical graphene-based electrothermal composite slurry was synthesized via a facile liquid-phase ball milling technique, employing mechanically exfoliated graphene as the conductive filler, aluminum dihydrogen phosphate as the binding agent and span85 as a dispersing agent. The resultant slurry was utilized to fabricate electrothermal coatings through screen printing technology. A comprehensive investigation was conducted to evaluate the influence of graphene concentration on the physical appearance, microstructure, electrothermal characteristics, and mechanical adherence of the electrothermal coatings. The findings indicate a positive correlation between graphene content and the electrical conductivity of the coatings, with a concurrent increase in the attainable heating temperature. Specifically, a coating comprising an equal ratio of graphene to aluminum dihydrogen phosphate exhibited a diminished square resistance of 16.10 Ω sq −1 and was capable of swiftly elevating to a temperature of 431 °C under an applied voltage of 36 V. Moreover, the coatings demonstrated robust adhesion to borosilicate glass, quartz glass, and stainless steel substrates, with particularly noteworthy adhesion strength of up to 49,160 mN on borosilicate glass. These attributes suggest a broad spectrum of high-temperature applications for the developed electrothermal coatings.
研究领域:
材料科学
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纳米技术
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产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2024
·Vol. 31
·期 10
·1-12
·
IF 2.6
Yang Renyu,Gan Lin,Huang Jin
Electromagnetic coatings on aircraft need high heat tolerance because high-speed friction bring high temperature. However, high molecular interaction and strong bonding, related to high heat-resistance, lower down the molecular motion ability, causing non-uniform dispersion of conductive fillers, especially for the epoxy type coatings, which has crosslink network. Here, we developed a novel curing system merging diethylenetriamine and dicarboxylic phthalimide to enhance temperature resistance and filler dispersion in epoxy resin. This system allows imide, strong bonding to enhance heat-resistance, to extend the chain of the epoxy resin, maintaining the molecular motion ability and optimizing the dispersion of fillers. Our study reveals that the epoxy composite’s decomposition temperature rises to 383.8℃, suitable for speeds exceeding Mach 3. Additionally, the percolation threshold for carbon black fillers drops to 8.1 vol. %, much lower than the traditional volume-exclusive systems ( ca. 70 vol. %). This finding confirms the maintained molecular motion ability of epoxy segments in crosslink netwrok. The electrical performance with volume resistivity dropping to 0.2 Ω·m when filler content is at the percolation threshold, meeting anti-static product requirements. This work proves that designing chain extenders can achieve high heat tolerance with minimal influence in crosslink and conductive networks.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2019
·
IF 6.309
Zhongyang Wang,Kai Sun,Peitao Xie,Yao Liu,Qilin Gu,Runhua Fan
The insulator-conductor percolative composites have been mostly constructed to achieve high permittivity and negative permittivity. In this work, permittivity transition from positive to negative is investigated in acrylic polyurethane-aluminum (APu/Al) percolative composites at radio frequency. Both the high permittivity and negative permittivity are accompanied with low loss due to the self-passivated nature of aluminum . The reactance and ac conductivity are studied to explain the dielectric properties , which provides an essential insight into the universal principles of high permittivity and negative permittivity behaviors in percolative composites. Meanwhile, when the conductive filler content exceeds the percolation threshold, a derived formula of permittivity has been put forward on the basis of the existing theoretical framework of percolation theory. Resourceful dielectric properties of APu/Al percolative composites will make them as potential alternatives for capacitors and metamaterials.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2025
·
IF 4.5
Xuelian Liu,Qian Li,Yuying Zheng,Weijie Zheng
Antistatic nylon-6 (PA6) composites have attracted considerable attention due to their tailored properties for electronics, textiles, and automotive applications. In this paper, the antistatic PA6 composites comprising with polypropylene (PP), aminated multi-walled carbon nanotubes (MWCNTs-NH 2 ) and aminated carbon black (CB–NH 2 ) were prepared by melt blending and compression molding. In the composite system, PP was used as the co-matrix to assist the phase separation of PA6. MWCNTs-NH 2 and CB-NH 2 were introduced as conductive fillers. All composites showed good thermal stability with the T 5 % higher than 376 °C and the composites containing fillers showed higher residues after thermal degradation due to the good thermal stability of MWCNTs-NH 2 and CB-NH 2 . The DSC and XRD results indicated that the crystallization properties of the composite materials were determined by PA6 and PP rather the conductive fillers. In general, the introduction of conductive fillers decreased the mechanical properties but effectively improved the conductivity of the composites and then the antistatic properties. Besides, the antistatic analysis and mechanical test denoted that MWCNTs-NH 2 and CB-NH 2 showed synergistic effect on improving the antistatic and mechanical properties of the composites, which was more evident at high MWCNTs-NH 2 quantity. The micromorphologies obtained by SEM first confirmed the ductile fracture of these composites, and then disclosed a two-phase structure of PA6 and PP polymer matrix, where the conductive fillers were found in the PA6 phase. Considering both mechanical and antistatic properties, the composite (PCNB-3) containing both 3 phr MWCNTs-NH 2 and CB-NH 2 was proposed for the antistatic PA6 composite.
研究领域:
材料科学
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复合材料工程
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2015
·Vol. 3
·期 11
·2693-2701
·
IF 4.696
Junjie Li,Chunhua Lai,Xiongzhi Xiang,Lei Wang
As representative conjugated polymers, the physical properties, such as electric conductivity and electro-optic properties, of poly-Schiff bases (PSBs) have been widely investigated. However, to date, the thermoelectric (TE) properties of PSB or related polymers remain unreported. In this study, PSB with a donor–acceptor structure (PSB(A)) was synthesized and was blended with different fillers to prepare polymer–inorganic TE composites. For comparison, PSB with the common structure (PSB(B)) was also synthesized, and PSB(B)–graphite composites were fabricated. The PSB(A)/graphite composites exhibited a higher power factor of 10.2 μW m−1 K−2 compared with 4.5 μW m−1 K−2 of the PSB(B)/graphite composites at the same doping level. The effects of different fillers on the TE properties of the PSB(A)-based composites were investigated in detail, and the highest TE figure of merit, ZT = 2.53 × 10−3, was obtained. The results show that excellent TE materials could be produced by preparing polymer–inorganic TE composites using novel conducting polymers with a special structure (e.g., donor–acceptor structure) and conducting fillers.
研究领域:
材料科学
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物理化学
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产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2021
·
IF 8.528
Weifei Wu,Xueqing Liu,Zhe Qiang,Jiying Yang,Yuhong Liu,Kai Huai,Bailang Zhang,Shuxiang Jin,Yumin Xia,Kun Kelvin Fu,Jianming Zhang,Yuwei Chen
A longstanding challenge in fabricating high dielectric polymer composite is how to rationalize structure design to improve dielectric permittivity while minimizing dielectric loss. Typically, adding conductive particles in to the composite often leads to an increase in the dielectric loss caused by leakage current due to ‘insulator-conductor’ transition at the percolation threshold. This work presents a strategy for simultaneously assembling conductive and insulating particles to form chainlike structures, based on dipole-dipole interactions induced by electric fields. Specifically, insulating barium titanate (BaTiO 3 ) particles can be subtly embeded in the conductive graphite channels to serve as barriers. The formation of such morphology plays an important role for balancing the high dielectric permittivity and relatively low dielectric loss for conductive fillers/polymer composite systems. With only 2.5 wt% graphite, the dielectric permittivity can be enhanced significantly upon electric field induced assembly, while the dielectric loss also inevitably increases to 396. By incorporating additional 5 wt% BaTiO 3 (barriers), we are able to reduce the dielectric loss to as low as 0.19 while the dielectric permittivity still remains relatively high (73.5). This work provides a critical material design concept for high-performance flexible dielectric materials based on creating barriers through the assistance of electric fields in ternary composites, which prevents the generation of leakage current between conductive fillers interfaces.
研究领域:
材料科学
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电气工程
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2024
·
IF 4.1
Yamin Liu,Changxin Chen,Di Chen,Jianmin Miao,Daxiang Cui,Jiajie Yu,Yiping Guo,Qichao Li
Miniaturized wearable electronic devices with strain sensors as core sensing elements hold significant applications in health monitoring and human-machine interaction. However, it remains a challenge to develop strain sensors with optimal response linearity, a wide detection range, and stability. In this study, to satisfy the above requirements, we construct high-performance wearable strain sensors (rGO-CNTOH@PSE) by a strategy of hybridizing conductive fillers with stretchable substrates. In detail, a synergistic conductive network is developed by adopting OH-containing carbon nanotube (CNTOH) and reduced graphene oxide (rGO) fillers with an appropriate mass ratio. After the network is integrated into a porous silicone elastomer substrate formed by the salt templating method, the developed strain sensor exhibits distinct resolution, consistent repeatability, and superior response linearity across a wide strain detection range of 0.3–303.03 %. Furthermore, the sensor also maintains good response stability over 15000 cycles of strain. We also demonstrate that this strain sensor showing outstanding exceptional detection performance has the capability for full-range human motion detection. A wireless smart electronic glove is developed based on the sensor, which can accurately recognize gesture movements and control a bionic robotic hand to replicate human hand actions, offering the potential for replacing manual tasks (such as, grasping in hazardous environments) in the future.
研究领域:
材料科学
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生物医学工程
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2024
·
IF 8.1
Yanzhi Cai,Dengpeng Chen,Laifei Cheng,Siyu Guo,Zhongyi Hu,Yuhan Wang,Haiming Yu,Yuan Zhou
The performance of sensors is often limited by the structural characteristics of the single form of conductive filler, making it difficult for sensors to simultaneously consider the broad sensing range and high sensitivity. How to achieve high sensitivity and broad working range of sensors through innovative sensing materials and sensor structure design remains a challenge. Here, a flexible sensor with multidimensional sensing materials and a double-layer structure is constructed. It consists of a high-performance CNTs@Ag-MXene-TPU sensing layer and a TPU flexible layer with significant deformability. Thanks to the synergistic effect of the double-layer structure and multidimensional sensing materials, this sensor has a high sensitivity of up to maximum gauge factor of 12216.3 and a wide sensing range of 300 %. Its response time and recovery time can reach 200 and 250 ms, respectively, and it also exhibits excellent cycling stability.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
Advanced Electronic Materials
·
2025
·
IF 5.3
Li Zhang,Zhaomeng Wang,Geng Wei,Puyue Xia,Sining Fan,Wenhao Zhang,Shaolong Tang
The preparation of conductive filler is a key technology in anisotropic conductive films preparation. In recent decades, research on the preparation of novel conductive particles has reached a bottleneck. Porous gold materials exhibit high compressibility, low density, and excellent conductivity. It is believed that using porous gold microspheres (PGMS) to supersede polymer composite conductive microspheres has the potential to prepare anisotropic conductive film (ACF) with better performance. However, preparing ultrafine (1–10 µm) PGMS remains challenging. Herein, the study presents a novel method for preparing PGMS with controllable particle size and high sphericity. Results show that porous gold microspheres ACF (PGMS-ACF), containing only 5 wt.% particles (size range 4.5–10.5 µm), achieves good conductivity when held at a pressure range of 0.05–0.6 MPa. Its compression ratio is between 33% and 71% at 0.3 MPa. The 4-point probe measurement shows a contact resistance as low as 10 mΩ in 2 mm 2 . Moreover, PGMS-ACF also exhibits a good linear relationship within 3.3 A. Compared to commercial polymer composite conductive microspheres ACF, PGMS-ACF offers a significant advantage in achieving a large compression ratio, which in turn leads to improved conductivity and reduces the need for precise sorting. The research provides a new approach for the preparation of novel ACF.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2022
·
IF 9.879
Zhuyu Ma,Kaiyi Zhang,Shengdu Yang,Yang Zhang,Xianchun Chen,Qiang Fu,Hua Deng
Capacitive sensors have vast application prospects. Their dielectric layer is hardened under high pressure, the sensitivity is reduced and sensing behavior is nonlinear. To tackle this, a novel strategy is used to incorporate voids, dielectric filler and conductive filler into the dielectric layer. Firstly, “root” like dendritic colloid polyurethane (DCPU) is prepared to grasp different content of carbon nanotube (CNT) and barium titanate (BaTiO 3 , BT), before such hybrid filler is coated onto the backbone of PU foam. For capacitive pressure sensors , it is observed that sensitivity increases with increasing filler content . More importantly, the addition of CNT into the inner layer of hybrid filler containing BT in the outer layer leads to linear pressure sensing behavior in a wide pressure range. Furthermore, the overall performance achieves a sensitivity of 2.51 kPa −1 under 0–100 kPa and a linearity of R 2 = 0.9989, and stable signals after 1000 cycles. Finally, it is successfully demonstrated that petals with a weight of 96 mg and the physiological signals of the human body such as heartbeat, swing arm amplitude, and joint bending can be detected. This work provides a new design inspiration for capacitive sensors with high sensitivity and high linearity in realizing medical health monitoring and motion detection.
研究领域:
材料科学
·
传感器技术
·
生物医学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）