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Synthesis of hierarchical cobalt dendrites based on nanoflake self-assembly and their microwave absorption properties
Wang, Xiaolei; Shi, Guimei; Shi, Fa-Nian; Xu, Ge; Qi, Yuanyang; Li, Da; Zhang, Zhidong; Zhang, Yajing; You, Hongpeng; Wang, XL; Shi, FN (reprint author), Shenyang Univ Technol, Sch Sci, Shenyang 110870, Peoples R China.; Wang, XL (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China.; Wang, XL (reprint author), Chinese Acad Sci, Int Ctr Mat Phys, Shenyang 110016, Peoples R China.
2016
Source PublicationRSC ADVANCES
ISSN2046-2069
Volume6Issue:47Pages:40844-40853
AbstractThree dimensional (3D) cobalt dendritic architectures composed of nanoflakes have been successfully fabricated by a facile hydrothermal self-assembly route. This method includes the preparation of cobalt dendritic architectures in a solution of cobalt chloride (CoCl2 center dot 6H(2)O) and sodium hydroxide (NaOH) at 110 degrees C for 24 h using pyromellitic acid (C10H6O8) as the complex agent and sodium hypophosphite (NaH2PO2 center dot H2O) as the reducing agent. The crystal structure, morphology, and microwave absorption properties of the as-prepared samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectra (XPS), scanning electron microscopy (SEM), and a network analyzer. The results show that reaction parameters, such as the molar ratio of C10H6O8 to CoCl2 center dot 6H(2)O, and concentration of NaOH, play a crucial effect on the morphology of the products. A plausible mechanism for the formation of hierarchical cobalt dendrites based on the Ostwald ripening process is proposed. The Co dendrite-paraffin composite containing 65 wt% of Co dendrites shows excellent microwave absorption properties. The optimal reflection loss (RL) of -30.2 dB is obtained at 12.5 GHz and RL below -10 dB covers the frequency range of 10.5-14.5 GHz with a thickness of 1.5 mm. The maximum RL values can reach -35.6 dB at 5.6 GHz with a thickness of 3 mm and the effective bandwidth (RL < -10 dB) is up to 11.8 GHz, in the frequency range of 2.7-14.5 GHz by adjusting the thickness of 1.5-5 mm. The excellent microwave absorption properties can be attributed to multiple dielectric relaxation and magnetic resonances, which contribute to proper impendence matching and a microwave attenuation constant. These results show that the 3D cobalt dendritic architecture is a great candidate for microwave absorption applications.
description.department[wang, xiaolei ; shi, guimei ; shi, fa-nian ; xu, ge ; qi, yuanyang] shenyang univ technol, sch sci, shenyang 110870, peoples r china ; [wang, xiaolei ; li, da ; zhang, zhidong] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china ; [wang, xiaolei ; li, da ; zhang, zhidong] chinese acad sci, int ctr mat phys, shenyang 110016, peoples r china ; [zhang, yajing] shenyang univ chem technol, coll chem engn, shenyang 110142, peoples r china ; [you, hongpeng] chinese acad sci, changchun inst appl chem, state key lab rare earth resource utilizat, changchun 130022, peoples r china
Subject AreaChemistry
Funding OrganizationDoctoral Science Foundation of Shenyang University of Technology; Science Research Foundation of Education Department of Liaoning Province [L2015396]; National Natural Science Foundation of China [51331006, 51301114, 51171185, 21571132]
Indexed Bysci
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/75972
Collection中国科学院金属研究所
Corresponding AuthorWang, XL; Shi, FN (reprint author), Shenyang Univ Technol, Sch Sci, Shenyang 110870, Peoples R China.; Wang, XL (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China.; Wang, XL (reprint author), Chinese Acad Sci, Int Ctr Mat Phys, Shenyang 110016, Peoples R China.
Recommended Citation
GB/T 7714
Wang, Xiaolei,Shi, Guimei,Shi, Fa-Nian,et al. Synthesis of hierarchical cobalt dendrites based on nanoflake self-assembly and their microwave absorption properties[J]. RSC ADVANCES,2016,6(47):40844-40853.
APA Wang, Xiaolei.,Shi, Guimei.,Shi, Fa-Nian.,Xu, Ge.,Qi, Yuanyang.,...&Wang, XL .(2016).Synthesis of hierarchical cobalt dendrites based on nanoflake self-assembly and their microwave absorption properties.RSC ADVANCES,6(47),40844-40853.
MLA Wang, Xiaolei,et al."Synthesis of hierarchical cobalt dendrites based on nanoflake self-assembly and their microwave absorption properties".RSC ADVANCES 6.47(2016):40844-40853.
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