Materials
·
2024
·Vol. 17
·期 15
·3747
·
IF 3.1
Ying Wu,Haijun Tang,Liying Kang,Hongfu Li,Naisheng Jiang
Rapid advancements and proliferation of electronic devices in the past decades have significantly intensified electromagnetic interference (EMI) issues, driving the demand for more effective shielding materials. Herein, we introduce a novel two-layer graphene nonwoven fabric (2-gNWF) that shows excellent EMI shielding properties. The 2-gNWF fabric comprises a porous fibrous upper layer and a dense conductive film-like lower layer, specifically designed to enhance EMI shielding through the combined mechanisms of reflection, multiple internal reflections, and absorption of electromagnetic waves. The 2-gNWF exhibits a remarkable EMI shielding effectiveness (SE) of 80 dB while maintaining an impressively low density of 0.039 g/cm3, surpassing the performance of many existing graphene-based materials. The excellent EMI shielding performance of 2-gNWF is attributed to the multiple interactions of incident electromagnetic waves with its highly conductive network and porous structure, leading to efficient energy dissipation. The combination of high EMI SE and low density makes 2-gNWF ideal for applications that require lightweight yet effective shielding properties, demonstrating the significant potential for advanced EMI shielding applications.
研究领域:
材料科学
·
电子工程
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Jianwen Ge,Li Liu,Yu Cui,Rui Li,Fandi Meng,Fuhui Wang
Whereas growing numbers of strong-absorption materials have been synthesized in recent years, it is also necessary to design broad-bandwidth, low-thickness, high-intensity absorbers. The ternary Fe 3 O 4 @SiO 2 @MnO 2 hybrids were fabricated via hydrothermal and hydrolysis processes, combined with typical core-shell structure characteristics and heterogeneous properties, further generating interfacial polarization behavior and enhancing anisotropy. Investigations of micromorphology manifested the hierarchical characteristic via the presence of inner mesoporous Fe 3 O 4 cores, outer SiO 2 layers (approximately 10 nm) and MnO 2 nanosheets as the surface of the hybrids. On the basis of rational design, the optimized multi-layers absorber exhibited excellent absorption performance with optimal reflection loss (RL min ) of −50.2 dB at 13.9 GHz, and the effective absorption band (EAB) is up to 5.1 GHz from 11.5 GHz to 16.6 GHz with the thickness of 2.6 mm. Due to the large surfaces, high porosity as well as the synergistic effect derived from the magnetic Fe 3 O 4 cores and dielectric SiO 2 @MnO 2 layers, this effective strategy may be endowed with high potential to design high-efficient absorbers.
研究领域:
材料科学
·
电磁学
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产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Xuan Chen,Changmei Wu,Wei Luo,Long Li,Lan Xie,Bai Xue
Developing an ultra-thin flexible polymer film with simultaneously excellent electromagnetic interference (EMI) shielding performance and satisfactory mechanical property is still urgently demanded but challenging for integrated and miniaturized electronics. Herein, alternating multilayered silver nanowire-coating polyvinyl alcohol/ferroferric oxide@silver nanowires (PVA/Fe 3 O 4 @AgNW) composite films were successfully fabricated through spraying AgNWs on electrospinning PVA/Fe 3 O 4 films, followed by hot pressing the alternately stacked monolayer PVA/Fe 3 O 4 and PVA/Fe 3 O 4 @AgNW films in total of 6 layers. Stemming from superior conductive AgNW networks, alternating multilayered PVA/10-Fe 3 O 4 @10-AgNW composite film exhibits the prominent electrical conductivity of 1.5 × 10 5 S/m. Noteworthily, 6-layered PVA/10-Fe 3 O 4 @10-AgNW composite film with a thickness of 30 μm displays excellent EMI shielding effectiveness (SE) of 80.8 dB, on account of the unique alternating multilayered architectures and synergistic effect of conductive AgNWs and magnetic Fe 3 O 4 . Furthermore, 6-layered PVA/10-Fe 3 O 4 @10-AgNW film possesses satisfactory tensile strength (16.7 MPa) as well as superb flexibility (The fracture strain is 200.6 %). This effort sheds a new avenue for ultrathin flexible electrospinning films with both high EMI SE and remarkable flexibility, which has potential application in intelligent, wearable, and portable electronics.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
WATER RESEARCH
·
2025
·
IF 12.4
Yunxia Zhu,Zhi Yang,Dawei Li,Kaijie Yang,Baoliang Chen
Interfacial solar evaporation with directional salt crystallization offers a sustainable approach for the mineral recovery. However, its application to real industrial wastewater is hindered by co-precipitate of organic pollutants, leading to crystal contamination. In this study, we present a rationally designed solar evaporator featuring dual functionality of directional crystallization and organic contaminants adsorption. The innovation lies in the coupling of an inclined evaporation surface with multilayer functional structures: a top hydrophobic layer for efficient solar energy harvesting, a middle hydrophilic layer for organic contaminants interception and bottom water transport layers for controlled water delivery. By tuning the inclination angle and water transport layers to regulate the mass transport, the evaporator achieves directional salt crystallization and maintains a stable evaporation rate of 1.42 kg m⁻² h⁻¹ during long-term evaluation. Moreover, the integrated adsorption layer effectively retained organic pollutions and purified the crystal. Compared to salts obtained through conventional thermal crystallization, the organic pollution content of the recovered crystals was reduced by 60.4%. The system’s scalability and outdoor applicability were further validated through a scaled-up rooftop test. This integrated interfacial evaporation strategy offers a new avenue for refined crystal recovery and advanced industrial wastewater treatment beyond the capabilities of conventional evaporators.
研究领域:
环境科学
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材料工程
·
化学工程
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产品关联
DOI
PubMed
高影响因子
Materials Today Physics
·
2024
·
IF 10
Chen Chen,Wenping Li,Shijun Xing,Junjie Yu,Qingxue Li,Ruizhen Hu,Lihong Liu,Jiazhi Yang,Qiaofeng Han
Air pollution has presented an imminent threat to the world. Multifunctional filters with high filtration efficiency, low pressure drop, moisture resistance, antibacterial properties, and renewability are urgently needed to be developed. In this study, multifunctional wood filters are innovatively designed with a baffle structure combining macroscopic structural design and microscopic in-situ synthesis of silver nanoparticles (Ag NPs). The filter has excellent particle removal efficiency (PM 0.3 , 98.5 %), exceptional volatile organic compounds (VOCs) adsorption efficiency (98.4 % for formaldehyde and 91.7 % for xylene), high sterilization efficiency (99.99 %) and excellent regeneration ability (performance recovery to 98 % of the initial). Furthermore, personal protective masks were assembled by the prepared filters, whose process of replacing element is as simple as replacement of electric mosquito incense tablets. This innovative filter holds promise for applications such as daily protection, sudden accidents and prevention and control of respiratory infectious diseases. We envision that the functionally modified Ag NPs wood filters with a multilayer structure offer a comprehensive solution for more effective air purification in polluted environment.
研究领域:
材料科学
·
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Fan Zhang,Zhi Li,Tong Cao,Kai Qin,Qunjie Xu,Haimei Liu,Yongyao Xia
Lithium–sulfur (Li–S) batteries have higher theoretical capacity and higher energy density, so they are considered to be one of the most promising candidates for next-generation energy storage devices. However, electrolyte-soluble polysulfides cause a shuttle effect and lead to poor cycle stability. This is one of the main obstacles to the practical applications of LSB technology. To overcome this problem, here, we report polar Ni2P hollow microspheres, with multilayer nesting, as sulfur host materials. Specifically, the multilayer polar Ni2P can simultaneously act as a multilayer physical barrier and chemical adsorption material. In addition, the Ni2P microspheres serve as activation catalysts, accelerating the redox reaction kinetics. The above features allow the structure to effectively suppress the shuttle effect and improve the discharge capacity and cycle stability of LSB. For example, the three-dimensional printed Ni2P@S (3DP-Ni2P@S) cathode can provide an initial capacity of 682 mAh/g, obtaining high cycle stability with low-capacity attenuation of 0.0072% per cycle for 400 cycles under 2C. Even when the sulfur loading is increased from 6.1 to 9.3 mg/cm2, this material still shows good capacity retention. This work inspires the design of multifunctional cathode materials and paves a new path for the development of Li–S batteries.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2019
·
IF 5.162
Xin Liang,Jufeng Yun,Kun Xu,Hongfa Xiang,Yong Wang,Yi Sun,Yan Yu
Lithium-sulfur (Li-S) batteries with lithium sulfide (Li 2 S) as cathode have attracted great attention recently, because of high specific capacity (1166 mA h g −1 ) of Li 2 S and potential safety of using Li metal-free anode. Li 2 S cathode has lower volume expansion and higher thermal stability than the traditional sulfur cathode. However, the problems of “shuttle effect” and poor electrical conductivity of the cathode material still need to be overcome. In this work, multi-layered Ti 3 C 2 /Li 2 S (ML-Ti 3 C 2 /Li 2 S) composite has been prepared and applied as a cathode in advanced Li-S batteries. The unique multi-layer sheet structure of Ti 3 C 2 provides space for the storage of Li 2 S, and its good conductivity greatly enhances the usage ratio of Li 2 S and improves the conductivity of the whole Li 2 S cathode. Compared with commonly used graphene, ML-Ti 3 C 2 can trap polysulfides effectively by chemical adsorption and also activate the reaction of Li 2 S to polysulfides by forming Ti-S bond. As a result, during the cycling of the batteries with ML-Ti 3 C 2 /Li 2 S cathodes, the activation voltage barrier of the first cycle has decreased to 2.8 V, and the “shuttle effect” has been suppressed effectively. The cycling and rate performances of the ML-Ti 3 C 2 /Li 2 S cathodes have been significantly improved compared to that of graphene/Li 2 S cathodes. They maintain a capacity of 450 mA h g −1 at 0.2 C after 100 cycles, and deliver attractive rate performances of 750, 630, 540, 470 and 360 mA h g −1 at 0.1 C, 0.2 C, 0.5 C, 1 C, and 2 C, respectively.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 39
·19094-19106
·
IF 9.931
Mengjie Li,Hao Li,Jin-Le Lan,Yunhua Yu,Zhongjie Du,Xiaoping Yang
Polymer/ceramic layered composite electrolytes have become promising electrolytes for Li metal batteries (LMBs) due to their high ionic conductivity, good mechanical properties, favorable wettability and excellent chemical stability to Li metal. However, the complexity of the preparation process and the increased interfacial resistance have hindered their extensive application in LMBs. To address these problems, we prepared a mesoporous epoxy resin matrix multilayer electrolyte composited with lithium lanthanum titanate (LLTO) nanoparticles (c-EME) using the traditional direct casting method. The c-EME possesses a high ionic conductivity of 2.02 × 10−3 S cm−1, a large Li-ion transference number of 0.82, a wide electrochemical stability window of up to 5.5 V (vs. Li+/Li) at room temperature and a smaller interfacial resistance compared with the pure epoxy resin matrix electrolyte (EME). In addition, the c-EME with a multilayer structure could infiltrate the electrode surface sufficiently and maintain uniform Li deposition even at a high current density, up to 4 mA cm−2, with an areal capacity of 12 mA h cm−2. Furthermore, the assembled LiFePO4/Li full battery with c-EME exhibits high cycling stability and superior rate performance. Our recent results provide a new avenue for developing a low cost, simple fabrication process for access to high safety and high stability LMBs based on porous epoxy resin-matrix electrolytes.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2021
·
IF 8.528
Xing-Yu Li,Pan-Pan Zhao,Lin-Xuan Han,Cong Deng
Flexible electromagnetic interference (EMI) shielding materials with low secondary electromagnetic radiation are urgently required for next-generation precise electronic devices and wearable electronics . However, realizing ultra-low microwave reflectivity and sustaining strong absorption feature in a wide frequency range remains a great challenge. Here, natural rubber-based flexible hierarchical composites were fabricated by combination of honeycomb-like 3D networks with selectively distributed ferro/ferric oxide modified graphene (F@rLG) magnetic particles and densely interconnected conductive networks (RL) with fulfilled multiwall carbon nanotubes (MWCNTs) via latex compounding together with co-vulcanization method. The resulting hierarchical bilayer elastomer has the EMI shielding coefficient of 34.4 dB at RL thickness of 0.18 mm, and achieves minimum electromagnetic wave reflection coefficient of 0.1. Moreover, in almost entire Ku band , over 80% incident electromagnetic waves can be absorbed, indicating its excellent capability in minimizing the secondary electromagnetic pollution . And this double-layered flexible material exhibits excellent stability in EMI shielding performance after the deformation cycles of 500 times. In addition, both the influence of precisely manipulated distribution of nanoparticles on the EMI property and the absorption-dominated approach via coupled layers were investigated in depth. This work paves a way for designing flexible EMI shielding materials with low secondary electromagnetic contamination.
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
Scientific Reports
·
2016
·Vol. 6
·期 1
·1-14
·
IF 5.228
Jiang Shenglin,Zeng Yike,Zhou Wenli,Miao Xiangshui,Yu Yan
Graphene deposited on various substrates has attracted the attention of the scientific and technical communities for use in a wide range of applications. Graphene on substrates is commonly produced by two types of methods, namely, methods that require a transfer step and transfer-free methods. Compared with methods that require a transfer step, transfer-free methods have a simpler procedure and a lower cost. Thus, transfer-free methods have considerable potential to meet the industrial and commercial demands of production methods. However, some limitations of the current transfer-free methods must be overcome, such as the high temperatures encountered during production, the relatively long manufacturing times, incompatibilities for both rigid and flexible substrates and an inability to extend the process to other two-dimensional (2-D) atomic crystals. In this work, a room-temperature rubbing method is developed for the rapid transfer-free production of defect-free polycrystalline graphene on rigid and flexible substrates. Starting with inexpensive commercially obtained graphite powder, mono- and few-layer graphene can be fabricated directly on various substrates, with an average production time of less than one minute (from raw graphite to graphene on the substrate). Importantly, this method can be extended to other 2-D atomic crystals.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBON
·
2019
·
IF 7.466
Wei Miao,Ying Liu,Xiaoyan Chen,Yixin Zhao,Shun Mao
In recent years, design high catalytic graphitic carbon nitride (g–C 3 N 4 )–based catalysts has drawn broad attention in environmental remediation. In this work, a series of iron-doped g-C 3 N 4 compounds were synthesized through a simple bottom-up strategy. By controlled pyrolysis , iron-doped g-C 3 N 4 materials split from bulk structure into multi-layer structure with uniformly dispersed mesopores. The catalytic activities of layered iron-doped g-C 3 N 4 in Fenton-like and photo-Fenton-like processes were investigated. Due to the doped iron, unique layered structure, and mesopore feature, the catalysts present greatly enhanced performance in heterogeneous Fenton-like reactions. Moreover, the degradation parameters calculated by the pseudo-first-order kinetic model fitted well with the specific surface area of the catalyst, indicating that the catalytic activities rely heavily on the specific surface area of layered and porous g-C 3 N 4 . This study presents a facile and generic method to regulate C 3 N 4 morphology and structure for enhanced catalytic activity in Fenton-like reactions.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Xiaolei Sun,Wenhe Xie,Feng Luo
Nickel oxide (NiO) holds great promise as a high-capacity anode material for rechargeable lithium-ion batteries. However, the major concern is the tremendous stresses and volume changes associated with repeated lithium insertion/extraction processes, leading to poor capacity retention and rate capability. To circumvent this problem, we demonstrate a rational design for the fabrication of multilayered NiO submicron flakes using a selective chemical etching strategy followed by a calcination treatment. When serving as lithium storage anodes, the multilayered NiO submicron flakes exhibit excellent cycling stability and rate capability, with a high reversible lithium extraction specific capacity of 532 mAh g −1 at a current rate of 0.6 C (1 C = 718 mA g −1 ) and a Coulombic efficiency close to 100% after 630 deep cycles. Even at an extremely high current rate of 120 C ( i.e. , 86,160 mA g −1 ), a suitable capacity of 61 mAh g −1 is still attained. Moreover, the electrodes also show superiority in function at high temperature (55 °C), delivering stable reversible capacities of 646 and 581 mAh g −1 at 0.2 and 0.4 C, respectively, after 50 cycles. Moreover, the post morphologies and compositions after long cycles are finally determined to demonstrate the efficient lamellar structure of the multilayers. This strategy provides a new avenue for designing various multilayered metal oxides and/or hybrid materials for use in energy storage and other related applications.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）