Construction of tunable and high-efficiency microwave absorber enabled by growing flower-like TiO2 on the surface of SiC/C nanofibers
Construction of tunable and high-efficiency microwave absorber enabled by growing flower-like TiO2 on the surface of SiC/C nanofibers
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在SiC/C纳米纤维表面生长花状TiO2构建可调谐高效微波吸收体
DOI：
10.1016/j.jssc.2021.122553
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发表时间：
2021-09
影响因子：
3.3
通讯作者：
Yufei Tang
中科院分区：
文献类型：
--
作者：
Yashan Huo;Kang Zhao;Peng Miao;Fuping Li;Zhengxin Lu;Qingnan Meng;Yufei Tang
通过静电纺丝和水热方法制备了花枝状 TiO2@SiC/C 复合纳米纤维，该纤维重量轻，在 2-18 GHz 频率范围内具有高效微波吸收 (MA)。相分析结果表明复合纳米纤维中存在金红石TiO2、β-SiC和无定形碳。纳米晶须沿金红石型TiO2纳米晶的(101)面随机生长在纳米纤维表面，形成花枝状结构。仿生形态产生了大量的异质结和多孔结构，通过协同效应实现界面极化、偶极子极化、电导损失、多重弛豫和合适的阻抗匹配。因此，当复合纳米纤维的填料含量变化时，在X和Ku波段实现了优异的吸波性能。当复合纳米纤维吸波体含量为 10 wt% 时，厚度小于 3 mm 时，最小反射损耗 (RL) 值小于 -45.3 dB。此外，最大有效吸收带宽 (EAB) 超过 5 GHz。这项研究开发了一种新结构来构建负载纳米晶须的复合纤维，并且 TiO2@SiC/C 纳米纤维可能成为宽带高效微波吸收体的出色候选者。此外，可调的吸波性能表明在各种环境条件下都有广泛的应用。
Flower branch-like TiO2@SiC/C composite nanofibers that are lightweight and have high-efficiency microwave absorption (MA) in the 2–18 GHz frequency range were fabricated via electrospinning and hydrothermal approaches. Phase analysis results showed the presence of rutile TiO2, β-SiC, and amorphous carbon in the composite nanofibers. Nanowhiskers grew randomly on the surface of the nanofibers along the (101) plane of rutile TiO2nanocrystalline and formed a flower branch-like structure. The bionic morphology generated a great deal of heterojunctions and porous structures, which enable interfacial polarization, dipole polarization, conductance loss, multirelaxation, and suitable impedance matching through synergistic effects. Therefore, excellent wave-absorbing performance was achieved in the X and Ku bands when the composite nanofibers' filler loading was changed. The minimum reflection loss (RL) value was less than −45.3 dB with the thickness of less than 3 mm when the composite nanofibers absorber content was 10 wt%. Also, the maximum effective absorption bandwidth (EAB) exceeded 5 GHz. This study developed a neoteric structure to construct composite fibers loaded with nanowhiskers, and the TiO2@SiC/C nanofibers could be a remarkable candidate for broadband and efficient microwave absorbers. Also, the tunable wave-absorbing performance indicates a wide range of applications is possible under various environmental conditions.
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