Carbon-coated Cu [Cu(C)] nanocapsules were prepared by a DC arc discharge method in a methane (CH4) atmosphere, and characterized by x-ray diffraction (XRD), thermal gravimetric analysis (TGA), scanning differential thermal analysis (SDTA), transmission electron microscopy (TEM) and Raman spectroscopy. The results show that the as-made product consists of carbon-coated Cu nanocapsules and giant onion-like fullerenes (GOLFs) in the diameter range of 20-50 nm. The graphite outer shells effectively protect the Cu cores from environmental oxidation, and have a greater defect density in comparison with bulk graphite and carbon nanotubes (CNTs). Its relatively complex permittivity (epsilon_r = epsilon' + i epsilon") is also measured at 2-18 GHz. The values of s' and e" reach 14.5 and 4.1, respectively, exhibiting excellent electromagnetic wave loss ability.
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机译：通过直流电弧放电法在甲烷（CH4）气氛中制备碳包覆的Cu [Cu（C）]纳米胶囊，并通过X射线衍射（XRD），热重分析（TGA），扫描差热分析（ SDTA），透射电子显微镜（TEM）和拉曼光谱。结果表明，制成的产品由碳包覆的铜纳米胶囊和直径在20至50 nm的巨型洋葱状富勒烯（GOLF）组成。与块状石墨和碳纳米管（CNT）相比，石墨外壳可有效保护Cu核免受环境氧化，并具有更大的缺陷密度。还测量了其相对复杂的介电常数（epsilon_r = epsilon'+ i epsilon”）。s'和e”的值分别达到14.5和4.1，具有出色的电磁波损耗能力。
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