Preparation and Electromagnetic Wave Absorption Properties of Core-Shell Ni/TiO₂ Microspheres

Abstract:

The composite microspheres with Ni cores and amorphous TiO₂ shells (Ni@TiO₂) were synthesized by a one-pot solvothermal method at 180°C for 15 h, which used nickel chloride hexahydrate as Ni source andtetrabutyl orthotitanate as Ti source. The Ni/TiO₂ core/shell composites were characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray (EDX). A possible formation mechanism of core-shell Ni/TiO₂ was proposed. Furthermore, the microwave absorption properties of these microspheres were investigated in terms of complex permittivity and permeability. The minimum reflection loss is-29.5 dB at 14.4 GHz for a layer of 4.0 mm thickness. Such phenomenon is attributed to the synergy effect between magnetic loss of Ni core and dielectric loss of amorphous TiO₂ shell. The enhanced microwave absorption properties are also believed to be due to the unique coreshell structure. All results indicate that these Ni@TiO₂ microspheres may be attractive candidate materials for electromagnetic wave absorption applications.

• Periodical: Key Engineering Materials (Volumes 602-603)
• Pages: 762-766
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.602-603.762
• Online since: March 2014
• Authors: Biao Zhao, Bing Bing Fan, Hao Chen, Xiao Xuan Pian, Bin Bin Wang, Wen Li, Bing Sun, Chen Yang Wang, Rui Zhang*
• Keywords: Core-Shell Ni/TiO₂, Dielectric Loss, Electromagnetic Wave Absorption, Magnetic Loss

References

[1] Z. Li, Y. Deng, B. Shen, W. Hu, Preparation and microwave absorption properties of Ni–Fe3O4 hollow spheres, Materials Science and Engineering: B 164 (2) (2009) 112-115.

DOI: 10.1016/j.mseb.2009.08.004

[2] X. Li, X. Han, Y. Tan, P. Xu, Preparation and microwave absorption properties of Ni–B alloy-coated Fe3O4 particles, Journal of Alloys and Compounds 464 (1) (2008) 352-356.

DOI: 10.1016/j.jallcom.2007.09.123

[3] K. Jia, R. Zhao, J. Zhong, X. Liu, Preparation and microwave absorption properties of loose nanoscale Fe3O4spheres, Journal of Magnetism and Magnetic Materials 322(15) (2010) 2167-2171.

DOI: 10.1016/j.jmmm.2010.02.003

[4] Z. Ma, R. Zhao, X. Yang, J. Wei, F. Meng, X. Liu, Microwave absorption properties of Fe3O4/CuPc hybrid material with cooperative dual nonlinear dielectric/magnetic resonance, Materials Letters 69(2012) 30-33.

DOI: 10.1016/j.matlet.2011.11.055

[5] X. Zhang, X. Dong, H. Huang, B. Lv, J. Lei, C. Choi, Microstructure and microwave absorption properties of carbon-coated iron nanocapsules, Journal of Physics D: Applied Physics 40 (17) (2007) 5383-5387.

DOI: 10.1088/0022-3727/40/17/056

[6] L. Yan, J. Wang, X. Han, Y. Ren, Q. Liu, F. Li, Enhanced microwave absorption of Fe nanoflakes after coating with SiO2 nanoshell, Nanotechnology 21 (9) (2010) 095708.

DOI: 10.1088/0957-4484/21/9/095708

[7] X. Liu, D. Geng, H. Meng, P. Shang, Z. Zhang, Microwave-absorption properties of ZnO-coated iron nanocapsules, Applied Physics Letters 92 (17) (2008) 173117-173117-3.

DOI: 10.1063/1.2919098

[8] Y. -J. Chen, P. Gao, R. -X. Wang, C. -L. Zhu, L. -J. Wang, M. -S. Cao, H. -B. Jin, Porous Fe3O4/SnO2 core/shell nanorods: Synthesis and electromagnetic properties, The Journal of Physical Chemistry C 113 (23) (2009) 10061-10064.

DOI: 10.1021/jp902296z

[9] X. Zhang, X. Dong, H. Huang, Y. Liu, W. Wang, X. Zhu, B. Lv, J. Lei, C. Lee, Microwave absorption properties of the carbon-coated nickel nanocapsules, Applied Physics Letters 89 (5) (2006) 053115-053115-3.

DOI: 10.1063/1.2236965

[10] L. Xi, Z. Wang, Y. Zuo, X. Shi, The enhanced microwave absorption property of CoFe2O4 nanoparticles coated with a Co3Fe7–Co nanoshell by thermal reduction, Nanotechnology 22 (4) (2011)045707.

DOI: 10.1088/0957-4484/22/4/045707

[11] Y. Xiong, J.M. McLellan, J. Chen, Y. Yin, Z. -Y. Li, Y. Xia, Kinetically Controlled Synthesis of Triangular and Hexagonal Nanoplates of Palladium and Their SPR/SERS Properties, Journal of the American Chemical Society 127 (48) (2005) 17118-17127.

DOI: 10.1021/ja056498s

[12] J. Guan, L. Liu, L. Xu, Z. Sun, Y. Zhang, Nickel flower-like nanostructures composed of nanoplates: one-pot synthesis, stepwise growth mechanism and enhanced ferromagnetic properties, CrystEngComm 13 (7) (2011) 2636-2643.

DOI: 10.1039/c0ce00805b

[13] J. Liu, J. Xu, R. Che, et al., Hierarchical magnetic yolk-shell microspheres with mixed barium silicate and barium titanium oxide shells for microwave absorption enhancement, Journal of Materials Chemistry 22 (18) (2012) 9277-9284.

DOI: 10.1039/c2jm30669g

[14] C. Yin, Y. Cao, J. Fan, et al., Synthesis of hollow carbonyl iron microspheres via pitting corrosion method and their microwave absorption properties, Applied Surface Science 270 (2013) 432-438.

DOI: 10.1016/j.apsusc.2013.01.044

[15] S. Ni, S. Lin, Q. Pan, F. Yang, K. Huang, D. He, Hydrothermal synthesis and microwave absorption properties of Fe3O4 nanocrystals, Journal of Physics D: Applied Physics 42 (5) (2009) 055004.

DOI: 10.1088/0022-3727/42/5/055004