Plasmon resonance strategy to enhance permittivity and microwave absorbing performance of Cu/C core-shell nanowires
Plasmon resonance strategy to enhance permittivity and microwave absorbing performance of Cu/C core-shell nanowires
复制标题
提高Cu/C核壳纳米线介电常数和微波吸收性能的等离子共振策略
DOI：
10.1016/j.cej.2019.122160
复制
发表时间：
2019-12-15
影响因子：
15.1
通讯作者：
Tong, Guoxiu
中科院分区：
文献类型：
--
作者：
He, Na;Liu, Minmin;Tong, Guoxiu
采用水热-碳热还原法制备了直径70 ~ 190 nm、壳厚5 ~ 40 nm、长100 μ m的单晶超长铜/碳纳米线（CSNWs）。通过改变烧结温度（Ts）、丙酮体积(V)和Cu(Ac)(2)与吡咯（δ）的摩尔比，可以很容易地调整Cu/C CSNWs的相结构、C壳厚度和芯径。利用微波吸收性能（MAP）对Cu/C CSNWs的合成工艺和结构进行了优化。在T-s = 600℃，δ =6， V= 0-1 mL条件下，直径为110 +/- 20 nm， C壳厚度为5-8 nm， C/Cu质量比为0.051 ~ 0.61的Cu/C碳纳米管具有最佳的MAP，有效带宽（R-L=-10 dB）最大值为6.28 GHz，对应于2.4 mm的样品厚度。在17.3 GHz时，样品厚度为2.0 mm时，R-L最小值为-46.6 dB。等离子体共振增强介电常数，双介电弛豫，高衰减和良好的阻抗匹配是优越的MAP的协同作用。这样，无疑开辟了利用等离子体共振提高介电常数和微波吸收性能来解决电磁污染问题的新策略。
Single crystalline ultralong Cu/C core-shell nanowires (CSNWs) with a diameter of 70-190 nm, a shell thickness of 5-40 nm and a length of up to 100 mu m have been synthesized in a high yield via a hydrothermal-carbonthermal reduction method. The phase structure, C shell thickness and core diameter of Cu/C CSNWs can handily be tuned via changing sintering temperate (Ts), acetone volume (V) and the molar ratios of Cu(Ac)(2) to pyrrole (delta). The microwave absorption performance (MAP) was used to optimize the synthetic process and structure of Cu/C CSNWs. The optimal MAP was exhibited by Cu/C CSNWs with the diameter of 110 +/- 20 nm, C shell thickness of 5-8 nm and C/Cu mass ratio of 0.051 to 0.61 produced at T-s = 600 degrees C, delta=6 and V= 0-1 mL. The effective bandwidth (R-L=-10 dB) showed the maximal value of 6.28 GHz, corresponding to a sample thickness of 2.4 mm. The minimum R-L value of -46.6 dB was reached at 17.3 GHz with a sample thickness of 2.0 mm. The superior MAP is ascribed to the synergy of Plasmon resonance enhanced permittivity, dual dielectric relaxation, high attenuation and good impedance matching. In this way, the new strategy for Plasmon resonance enhance permittivity and microwave absorbing performance to solve electromagnetic (EM) pollution problems are undoubtedly opened up.