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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Doping strategy to boost electromagnetic property and gigahertz tunable electromagnetic attenuation of hetero-structured manganese dioxide
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Doping strategy to boost electromagnetic property and gigahertz tunable electromagnetic attenuation of hetero-structured manganese dioxide

机译：掺杂策略提高电磁特性和千兆赫兹可调谐电磁衰减杂锰二氧化碳

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A facile and simple chemical route has been used to synthesize novel three-dimensional (3D) architectures of nickel-doped epsilon-MnO2 without the addition of any surfactant or organic template. Nickel salt is used directly as the reagent rather than as an additive to produce doped manganese dioxide, which is different from the overwhelming majority of previous synthetic methods for doped MnO2 for use as an electromagnetic wave absorption material. This method overcomes the shortcomings of the previously reported approaches of doping with a slight amount of metallic ion, which is sometimes hard to detect. The chemical composition of the samples is analyzed by electron-probe micro-analysis (EPMA) and energy dispersive spectroscopy (EDS). The chemical state of the elements in the composites is demonstrated with X-ray photoelectron spectroscopy (XPS). The structures of the micro-spheres are detected by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that the self-organized crystals are made up of walnut-like spheres and are arrays of polycrystals. The nickel ion is certified to have been successfully doped into the crystal based on the results of EPMA, EDS, and XPS as well as dark field scanning TEM. Thus, a multiple heterojunction structure is constructed. After nickel doping, the crystalline phase remains epsilon type and the morphology turns into a walnut-like structure. Electromagnetic performances also exhibit significant variation with the introduction of nickel ions. Nickel-doped MnO2 has a decreased dielectric constant compared with that of commercial MnO2, while the nickel-doped MnO2 appears to have fascinating magnetic properties with a maximum magnetic loss tangent value of 0.37, which is 7 times greater than that of the dielectric loss tangent. Likewise, it is further presented that the optimized electromagnetic capacities are related to the mass fraction of the walnut-like MnO2 spheres in the composite. When
机译：穿着和简单的化学路线已被用于合成镍掺杂的ε-mnO2的新型三维（3D）架构，而不添加任何表面活性剂或有机模板。镍盐直接用作试剂而不是添加剂，以产生掺杂的二氧化锰，这与掺杂MnO2的预先制作的合成方法不同，以用作电磁波吸收材料。该方法克服了先前报道的掺杂方法的缺点，略微金属离子，有时难以检测。通过电子探针微分析（EPMA）和能量分散光谱（EDS）分析样品的化学成分。用X射线光电子体光谱（XPS）对复合材料中的元素的化学状态进行说明。通过扫描电子显微镜（SEM）和透射电子显微镜（TEM）来检测微球的结构。结果表明，自组织的晶体由类似核桃状的球体组成，并且是多晶的阵列。通过EPMA，EDS和XPS的结果以及暗场扫描TEM，镍离子经认证成功掺杂到晶体中。因此，构建了多个异质结结构。在镍掺杂后，结晶相保持ε型，并且形态变成核桃状结构。电磁性能还表现出镍离子的引入显着变化。与商业MnO2相比，镍掺杂的MnO 2具有降低的介电常数，而镍掺杂的MnO 2似乎具有迷人的磁性，最大磁性损耗切线值为0.37，这比介电损耗正切的7倍。 。同样地，还介绍了优化的电磁能力与复合材料中核桃状MnO2球的质量分数有关。什么时候

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    He Gaihua; Duan Yuping; Song Lulu; Zhang Xuefeng;

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    Dalian Univ Technol Key Lab Solidificat Control &

    Digital Preparat Te Sch Mat Sci &

    Engn Dalian 116085 Peoples R China;

    Dalian Univ Technol Key Lab Solidificat Control &

    Digital Preparat Te Sch Mat Sci &

    Engn Dalian 116085 Peoples R China;

    Dalian Univ Technol Key Lab Solidificat Control &

    Digital Preparat Te Sch Mat Sci &

    Engn Dalian 116085 Peoples R China;

    Northeastern Univ Sch Mat Sci &

    Engn Shenyang 110819 Liaoning Peoples R China;

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  • 中图分类 化学;无机化学;
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