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Oxygen-vacancies-rich Ti n O 2n-1 quantum dots embedded Ti 3 CNT x /CNTs foam by HCl induced self-assembly and spontaneous oxidation towards strong and multiband microwave absorption
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| 【文章作者】Hu, Kexuan;Xu, Yan;Pan, Limei;Li, Qian;Wang, Yang;Li, Quan;Yang, Jian |
| 【文章摘要】 Ti3CNTx/TinO2n-1 foam and Ti3CNTx/CNTs/TinO2n-1 foam were prepared by hydrochloric acid (HCl) induced self-assembly and freeze-drying, during which oxygen-vacancies-rich TinO2n-1 quantum dots in situ grown on Ti3CNTx nanoflakes as a result of their slight and spontaneous oxidation. The well-developed pore structure, abundant interfaces, unique dangling bonds, defects and terminated groups on highly conductive Ti3CNTx nanoflakes, as well as the oxygen vacancies in TinO2n-1 quantum dots render the foams with superior impedance matching, intensive multiple reflection and dielectric loss. By immersing the foams into molten paraffin (absorber content: 4.2 wt%), excellent microwave absorption (MA) properties were achieved: an effective absorption bandwidth (EAB) of 5.2 GHz (1.55 mm) and a reflection loss (RL) of -81.3 dB (1.85 mm) for Ti3CNTx/Ti(n)O(2n-1)foam, and an EAB of 6.4 GHz and a RL of -54.3 dB (1.85 mm) for Ti3CNTx/CNTs/TinO2n-1 foam (15 wt% CNTs). Moderate addition of CNTs enhanced the conduction loss and polarization loss, leading to a larger EAB. When adjusting the thickness (1.2-5 mm), the EAB of Ti3CNTx/TinO2n-1 foam (14.7 GHz) and Ti3CNTx/CNTs/TinO2n-1 foam (15.3 GHz) both covered the C, X and Ku band. This work offers a simple and facile method for constructing Ti3CNTx-based foams as excellent MA materials. |
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【卷】【ISSUE】【ISSUEID】
【文章期份】2024
【发布日期】2025/5/13 10:04:16
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