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Acidified Bimetallic MOFs Constructed Co/N Co-doped Low Dimensional Hybrid Carbon Networks for High-Efficiency Microwave Absorption
Carbon ( IF 10.9 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.carbon.2020.08.070
Xueqing Xu , Feitian Ran , Zhimin Fan , Zhongjun Cheng , Tong Lv , Lu Shao , Zhimin Xie , Yuyan Liu

Abstract Metal-organic frameworks (MOFs) derived carbon-based nano/micro-structured composites are booming as a promising class of microwave absorption (MA) material. However, rational design and endow MOFs derived MA materials with interconnected low dimensional hybrid networks are still challenging but significant for boosting the MA performances. Herein, 3D Co/N co-doped carbon networks with hybrid different low dimensional units, including carbon nanosheet framework (H-700), bamboo-like carbon nanotube interpenetrated carbon nanosheet hybrid network (H-800), and interweaved bamboo-like carbon nanotube network attached carbon nanosheet (H-900) have been controllably fabricated through pyrolyzing the acidified bimetallic ZIF-L. Moreover, hybrid network structures are favoring electron transportation, interface polarization, multiple loss, as well as impedance matching. Consequently, the H-800 exhibits a strong absorption ability with minimum reflection loss of -56.2 dB, while the H-900 has a broad absorption bandwidth of 5.2 GHz with thin thickness (1.8 mm) and low weight ratio (10 wt.%). This work presents a novel strategy to construct the low dimensional hybrid networks from MOFs for expanding more potential application.

中文翻译:

酸化双金属 MOF 构建 Co/N 共掺杂低维混合碳网络用于高效微波吸收

摘要 金属有机框架 (MOF) 衍生的碳基纳米/微结构复合材料作为一类有前途的微波吸收 (MA) 材料正在蓬勃发展。然而,合理设计并赋予 MOF 衍生的 MA 材料具有互连的低维混合网络仍然具有挑战性,但对于提高 MA 性能具有重要意义。在此,具有混合不同低维单元的 3D Co/N 共掺杂碳网络,包括碳纳米片框架(H-700)、竹状碳纳米管互穿碳纳米片混合网络(H-800)和交织竹状碳通过热解酸化的双金属 ZIF-L,可以可控地制造纳米管网络附着的碳纳米片(H-900)。此外,混合网络结构有利于电子传输、界面极化、多重损耗、以及阻抗匹配。因此,H-800 具有很强的吸收能力,最小反射损耗为 -56.2 dB,而 H-900 具有 5.2 GHz 的宽吸收带宽,厚度薄(1.8 mm)和低重量比(10 wt.%) . 这项工作提出了一种从 MOF 构建低维混合网络的新策略,以扩展更多潜在应用。
更新日期:2021-01-01
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