Carbon materials possess inherent dielectric properties that enhance electromagnetic wave(EMW)absorption.However,their single-loss mechanism often restricts the effective bandwidth,while traditional carbonbased EMW ab...Carbon materials possess inherent dielectric properties that enhance electromagnetic wave(EMW)absorption.However,their single-loss mechanism often restricts the effective bandwidth,while traditional carbonbased EMW absorbing materials face constraints owing to expensive raw materials and complex synthesis processes,hindering industrialization.To address these challenges,we utilize cost-effective and readily available metal phthalocyanine as a precursor.The incorporation of magnetic metal components induces magnetic loss mechanisms that effectively compensate for the predominant dielectric characteristics of the carbon matrix.Through a simple grinding and carbonization process,metal nanoparticles are uniformly dispersed within a nitrogen-doped carbon matrix,thereby creating numerous defects and abundant heterogeneous interfaces.The resulting composites exhibit exceptional EMW absorption,attributed to synergistic multiple-loss mechanisms.Notably,the CuCoNiZn/NC composite attains an effective absorption bandwidth(EAB)of 5.6 GHz,while the Cu/NC composite achieves a minimum reflection loss(RL_(min))of-53.7 dB with an EAB of 5.52 GHz.Additionally,CST simulations validate the practical applicability of the absorber.This study presents a viable pathway for industrializing high-performance waveabsorbing materials.展开更多
The reasonable design of the composition of the composite materials is of great significance to optimized the electromagnetic(EM)wave absorption performance.Herein,the Ni/NiO@C hybrid composites with tunable Ni propor...The reasonable design of the composition of the composite materials is of great significance to optimized the electromagnetic(EM)wave absorption performance.Herein,the Ni/NiO@C hybrid composites with tunable Ni proportion were successfully synthesized through a two-step process.With the assistance of X-ray diffraction with refinement treatment,the specific proportion of Ni of as-obtained hybrid composites could be obtained.Employing controlling calcination time to adjust the Ni content of Ni/NiO@C hybrid composites,it has been found that the composite carbonized at 500℃exhibited remarkable EM wave absorption with the minimum reflection loss(RLmin)of-49.1 dB at 4.9 mm and the widest effective absorption bandwidth(EABmax)of 4.56 GHz at 2.1 mm.Moreover,by adjusting the Ni source,the optimal EM wave absorption performance could be achieved.Results illustrated that the N3PC with the Ni proportion of 13.17%showed the RLm inas low as-51.1 dB at 2.4 mm and the EABmax was 5.12 GHz at 2.7 mm.It is worth noting that this work demonstrates the relevance of the composition and EM wave absorption performance of hybrid composites,which offers a feasible reference for the absorption mechanism of absorber.展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.52303353 and 52403362)the School-Level Research Projects of Yancheng Institute of Technology(No.xjr2023024)
文摘Carbon materials possess inherent dielectric properties that enhance electromagnetic wave(EMW)absorption.However,their single-loss mechanism often restricts the effective bandwidth,while traditional carbonbased EMW absorbing materials face constraints owing to expensive raw materials and complex synthesis processes,hindering industrialization.To address these challenges,we utilize cost-effective and readily available metal phthalocyanine as a precursor.The incorporation of magnetic metal components induces magnetic loss mechanisms that effectively compensate for the predominant dielectric characteristics of the carbon matrix.Through a simple grinding and carbonization process,metal nanoparticles are uniformly dispersed within a nitrogen-doped carbon matrix,thereby creating numerous defects and abundant heterogeneous interfaces.The resulting composites exhibit exceptional EMW absorption,attributed to synergistic multiple-loss mechanisms.Notably,the CuCoNiZn/NC composite attains an effective absorption bandwidth(EAB)of 5.6 GHz,while the Cu/NC composite achieves a minimum reflection loss(RL_(min))of-53.7 dB with an EAB of 5.52 GHz.Additionally,CST simulations validate the practical applicability of the absorber.This study presents a viable pathway for industrializing high-performance waveabsorbing materials.
基金financially supported by the National Natural Science Foundation of China(Nos.51407134,51801001 and 51801108)Natural Science Foundation of Shandong Province(No.ZR2019YQ24)+5 种基金China Postdoctoral Science Foundation(No.2016M590619,No.2016M601878)Provincial Key Research and Development Program of Shaanxi(No.2019GY-197)the Qingchuang Talents Induction Program of Shandong Higher Education Institution(Research and Innovation Team of Structural-Functional Polymer Composites)the support from The Thousand Talents PlanThe World-Class University and DisciplineThe Taishan Scholar’s Advantageous and Distinctive Discipline Program of Shandong ProvinceThe World-Class Discipline Program of Shandong Province。
文摘The reasonable design of the composition of the composite materials is of great significance to optimized the electromagnetic(EM)wave absorption performance.Herein,the Ni/NiO@C hybrid composites with tunable Ni proportion were successfully synthesized through a two-step process.With the assistance of X-ray diffraction with refinement treatment,the specific proportion of Ni of as-obtained hybrid composites could be obtained.Employing controlling calcination time to adjust the Ni content of Ni/NiO@C hybrid composites,it has been found that the composite carbonized at 500℃exhibited remarkable EM wave absorption with the minimum reflection loss(RLmin)of-49.1 dB at 4.9 mm and the widest effective absorption bandwidth(EABmax)of 4.56 GHz at 2.1 mm.Moreover,by adjusting the Ni source,the optimal EM wave absorption performance could be achieved.Results illustrated that the N3PC with the Ni proportion of 13.17%showed the RLm inas low as-51.1 dB at 2.4 mm and the EABmax was 5.12 GHz at 2.7 mm.It is worth noting that this work demonstrates the relevance of the composition and EM wave absorption performance of hybrid composites,which offers a feasible reference for the absorption mechanism of absorber.
