Preparation and microwave absorbing properties of MoS2/biomass carbon composite
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摘要: 为了解决MoS2吸波材料电导率低的问题,以柚子皮(SP)为原料,采用一锅水热及高温煅烧法制备了MoS2/生物质碳(BC)复合材料。通过调节初始Mo源、S源的含量来调控该复合材料中MoS2的含量。微观形貌、结构和电磁参数结果表明,随着复合材料中MoS2含量的增加,MoS2在BC表面由片状零散分布转变为花状包覆,MoS2/BC复合材料的电导率和复介电常数逐渐降低。通过调节MoS2与BC的比例,实现对MoS2/BC复合材料电磁参数的有效调控,进而优化其阻抗匹配特性。MoS2的花状结构有利于促进电磁波的多重反射/散射。同时,MoS2与BC之间存在丰富界面,有利于促进界面极化,增强MoS2/BC复合材料对电磁波的衰减能力。所制备的MoS2/BC-0.8最小反射率损失(RL)值为−40.1 dB,有效吸收带宽为5.9 GHz(11.1~17.0 GHz)。Abstract: In order to solve the problem of low conductivity of MoS2 absorbing material, the MoS2/biomass carbon (BC) composite material was prepared by using shaddock peel (SP) as the raw material, using one-pot hydro-thermal and high-temperature calcination methods. The content of MoS2 in the composite material was adjusted by adjusting the content of the initial Mo source and S source. The results of microscopic morphology, structure and electromagnetic parameters show that with the increase of the MoS2 content in the composite material, the scattered distribution of MoS2 on the BC surface changes from flakes to flower-like coatings, and the conductivity and complex permittivity of MoS2/BC composites gradually decrease. By adjusting the ratio of MoS2 to BC, the effective control of the electromagnetic parameters of the MoS2/BC composite material is realized, and its impedance matching characteristics are optimized. The flower-like structure of MoS2 facilitates the multiple reflection/scattering of electromagnetic waves. At the same time, there are abundant interfaces between flower-like MoS2 and BC, which is beneficial to promote interface polarization and enhance the attenuation ability of MoS2/BC composites to electromagnetic waves. The prepared MoS2/BC-0.8 has a minimum reflectance loss (RL) value of –40.1 dB, and an effective absorption bandwidth of up to 5.9 GHz (11.1-17.0 GHz).
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Key words:
- biomass /
- MoS2 /
- shaddock peel /
- composites /
- impedance match /
- microwave absorption properties
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表 1 不同钼酸钠、L-半胱氨酸和柚子皮 (SP) 添加量下制备的生物质碳 (BC)、MoS2/BC复合材料的参数
Table 1. Parameters of biomass carbon (BC) and MoS2/BC composites prepared with different additions of sodium molybdate, L-cysteine and shaddock peel (SP)
Samples SP/g Na2MoO4·2H2O/g L-cysteine/g BC 0.25 0 0 Mo2S/BC-0.4 0.25 0.10 0.22 Mo2S/BC-0.6 0.25 0.15 0.33 Mo2S/BC-0.8 0.25 0.20 0.44 表 2 BC和MoS2/BC复合材料的电导率
Table 2. Conductivity of BC and MoS2/BC composites
Sample BC MoS2/BC-0.4 MoS2/BC-0.6 MoS2/BC-0.8 Electrical conductivity/(S·cm−1) 2.53×10−2 4.95×10−3 2.11×10−3 1.13×10−4 表 3 MoS2/BC复合材料与文献报道其他吸波材料性能比较
Table 3. Performance comparison between MoS2/BC composite and other wave absorbing agents reported in the literature
Absorber Minimum RL (dB)/
Thickness (mm)Bandwidth (GHz)/
Thickness (mm)Ref. 3D MoS2 −10.3/4.0 0.08/4.0 [11] 3D MoS2/RGO −49.5/2.4 5.7/2.3 [11] MoS2/GN −55.3/1.6 5.6/2.2 [12] CNTs@MoS2 −55.0/1.5 4.0/1.3 [13] MoS2/RGO −50.9/2.3 5.7/2.0 [36] MoS2/BC-0.8 −40.1/3.0 5.9/2.0 This work Notes: RGO—Reduced graphene oxide; GN—Graphene; CNTs—Carbon nanotubes; RL—Reflectivity loss. -
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