Engineering Phase Transformation of MoS2/RGO by N-doping as an Excellent Microwave Absorber
Engineering Phase Transformation of MoS2/RGO by N-doping as an Excellent Microwave Absorber
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DOI：
10.1021/acsami.0c01998
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发表时间：
2020-04-08
影响因子：
9.5
通讯作者：
Che, Renchao
中科院分区：
文献类型：
--
作者：
Guo, Huiqiao;Wang, Lei;Che, Renchao
二硫化钼作为一种新型的二维材料，由于其独特的结构，在电磁波响应领域的应用受到了广泛的关注。然而，纳米结构MoS 2的电子导电性迫切需要优化。在此，氮掺杂的1 T @ 2 H-MoS 2/还原氧化石墨烯（RGO）复合材料通过水热反应和在NH3气氛下的连续煅烧有效地构造。所制备的复合材料具有良好的微波吸收（MA）性能，在Ku波段预期吸收带宽（4.00 GHz），最大反射损耗值（-67.77dB），远优于传统的2 H-MoS 2或2 H-MoS 2/RGO的性能。突出的吸收特性归因于（i）支撑在2D RGO上的玫瑰状MoS 2的独特自组装形态;（ii）在2 H和1 T之间的可控结晶相切换;以及（iii）由强烈的多极化引起的明亮能量衰减。此外，占主导地位的MA机制被描述为由RGO和MoS 2之间的相互作用激发的局部极化。因此，我们的新结构设计提供了必要的参考，以实现基于二维材料的优化吸收性能。
As a hot two-dimensional (2D) material, molybdenum disulfide has been attracting extensive attention for electromagnetic wave response applications because of its unique structure. However, the electronic conductivity of nanostructured MoS2 needs to be optimized urgently. Here, nitrogen-doped 1T@2H-MoS2/reduced graphene oxide (RGO) composites are effectively constructed by hydrothermal reaction and consecutive calcination under an NH3 atmosphere. The prepared composites possess great microwave absorption (MA) performance with an expected absorption bandwidth (4.00 GHz) at the Ku band and a maximum reflection loss value (-67.77 dB), which is much better than the performance of conventional 2H-MoS2 or 2H-MoS2/RGO. The prominent absorption property is ascribed to the (i) unique self-assemble morphology of rose-like MoS2 supported on 2D RGO; (ii) controllable crystalline phase switch between 2H and 1T; and (iii) brilliant energy attenuation caused by the intense multipolarization. Furthermore, the dominant MA mechanism is described as the local polarization motivated by the interaction between RGO and MoS2. Thus, our novel structure design provides a necessary reference to achieve optimized absorption performance based on 2D materials.