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(searched for: doi:10.1016/j.jmst.2020.09.012)
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, Guochen Zhao, Jixue Zhou, Pu Chen, Chao Li
Published: 1 June 2021
Ceramics International, Volume 47, pp 15958-15967; doi:10.1016/j.ceramint.2021.02.170

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D.A. Vinnik, V.E. Zhivulin, D.P. Sherstyuk, A.Y. Starikov, P.A. Zezyulina, S.A. Gudkova, D.A. Zherebtsov, K.N. Rozanov, , K.A. Astapovich, et al.
Published: 1 June 2021
Materials Today Chemistry, Volume 20; doi:10.1016/j.mtchem.2021.100460

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, Xiaochuang Di, Zhao Lu, Xinming Wu
Journal of Colloid and Interface Science, Volume 589, pp 462-471; doi:10.1016/j.jcis.2021.01.013

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Na Zhang, Puzhen Chen, Weixing Chen, Hongli Zhang, Yan Wang
Progress in Natural Science: Materials International; doi:10.1016/j.pnsc.2021.04.007

Abstract:
A general strategy has been developed here to supramolecular self-assembly of nickel (Ⅱ)-substituted α-Keggin-type polyoxometalate and polyaniline coated Fe2O3 hollow nanospindle (Fe2O3 hollow [email protected]/α-SiW11Ni composites) via electrostatic attraction and hydrothermal method. Fe3+ was first hydrolyzed and polymerized into Fe2O3, then dissolved into [Fe(H2PO4)x]3−x, resulting in hollow structure. The polyoxometalate existed in polyaniline as a proton-doped counter-ion form, rather than as a separate crystalline state. The protons and anions entered the PANI main chain and combined with N atoms of amines and imines on the PANI chain ((-NH‧+ ​= ​)/α-[SiW11Ni(H2O)O39]6-) to form poles and bipolar delocalization into π bonds of the whole polyaniline molecular chain, which leaded to conductance and polarization. The Fe2O3 hollow [email protected]/α-SiW11Ni composites were proven to be excellent microwave absorber in terms of reflection loss (RL) and bandwidth. The maximum RL value was up to −53.6 ​dB at 3.5 ​mm and 6.9 ​GHz. The broadest absorption bandwidth exceeding −10 dB was 6.3 ​GHz at a thickness of only 1.9 ​mm. Moreover, the ternary composites presented obvious multi-band absorption with the matching thickness range of 1.5–5 ​mm. The absorption peaks bandwidth reached as wide as 14.3 ​GHz, which included all C-Ku bands. The hollow and core-shell structures could provide non-uniform interface for the induced polarization loss and space for the reflecting and scattering of microwave. The carrier, pair-ion carrier and hydrogen bond network could lead to conduction loss. The magnetic losses were caused by eddy current effect and natural resonance. This work can lay a theoretical foundation for the design and performance regulation of new absorbing materials.
Jing Yan, , Xiangyong Zhang, Xin Gong, Chen Chen, Guangdi Nie, Xudong Liu, Panbo Liu
Nano-Micro Letters, Volume 13, pp 1-15; doi:10.1007/s40820-021-00646-y

Abstract:
Phase engineering is an important strategy to modulate the electronic structure of molybdenum disulfide (MoS2). MoS2-based composites are usually used for the electromagnetic wave (EMW) absorber, but the effect of different phases on the EMW absorbing performance, such as 1T and 2H phase, is still not studied. In this work, micro-1T/2H MoS2 is achieved via a facile one-step hydrothermal route, in which the 1T phase is induced by the intercalation of guest molecules and ions. The EMW absorption mechanism of single MoS2 is revealed by presenting a comparative study between 1T/2H MoS2 and 2H MoS2. As a result, 1T/2H MoS2 with the matrix loading of 15% exhibits excellent microwave absorption property than 2H MoS2. Furthermore, taking the advantage of 1T/2H MoS2, a flexible EMW absorbers that ultrathin 1T/2H MoS2 grown on the carbon fiber also performs outstanding performance only with the matrix loading of 5%. This work offers necessary reference to improve microwave absorption performance by phase engineering and design a new type of flexible electromagnetic wave absorption material to apply for the portable microwave absorption electronic devices.
Chen Chen, , Zhuoyue Meng, Jiaxin Zhang, Mengwei Lu, Panbo Liu, Tiehu Li
Journal of Colloid and Interface Science, Volume 588, pp 657-669; doi:10.1016/j.jcis.2020.11.058

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Beilei Qiu, Lei Xie, Jie Zeng, Tianyi Liu, Miao Yan, Shan Zhou, Qirui Liang, Jinyao Tang, Kang Liang,
Published: 18 March 2021
by Wiley
Advanced Functional Materials, Volume 31; doi:10.1002/adfm.202010694

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Puzhen Chen, , Weixing Chen, Yan Wang
Published: 1 March 2021
Ceramics International, Volume 47, pp 6453-6462; doi:10.1016/j.ceramint.2020.10.228

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