title: Uniform Fe3O4 coating on flower-like ZnO nanostructures by atomic layer deposition for electromagnetic wave absorption.
abstract: An elegant atomic layer deposition (ALD) method has been employed for controllable preparation of a uniform Fe3O4-coated ZnO (ZnO@Fe3O4) core-shell flower-like nanostructure. The Fe3O4 coating thickness of the ZnO@Fe3O4 nanostructure can be tuned by varying the cycle number of ALD Fe2O3. When serving as additives for microwave absorption, the ZnO@Fe3O4-paraffin composites exhibit a higher absorption capacity than the ZnO-paraffin composites. For ZnO@500-Fe3O4, the effective absorption bandwidth below -10 dB can reach 5.2 GHz and the RL values below -20 dB also cover a wide frequency range of 11.6-14.2 GHz when the coating thickness is 2.3 mm, suggesting its potential application in the treatment of the electromagnetic pollution problem. On the basis of experimental observations, a mechanism has been proposed to understand the enhanced microwave absorption properties of the ZnO@Fe3O4 composites.
authors.affiliation: Key Laboratory of Tropical Biological Resources of Ministry of Education, Hainan University, Haikou 570228, China. wangguizhen0@hotmail.com.
authors.forename: Gengping
authors.initials: G
authors.lastname: Wan
authors.affiliation: Key Laboratory of Tropical Biological Resources of Ministry of Education, Hainan University, Haikou 570228, China. wangguizhen0@hotmail.com.
authors.forename: Guizhen
authors.initials: G
authors.lastname: Wang
authors.affiliation: Key Laboratory of Tropical Biological Resources of Ministry of Education, Hainan University, Haikou 570228, China. wangguizhen0@hotmail.com.
authors.forename: Xianqin
authors.initials: X
authors.lastname: Huang
authors.affiliation: Key Laboratory of Tropical Biological Resources of Ministry of Education, Hainan University, Haikou 570228, China. wangguizhen0@hotmail.com.
authors.forename: Haonan
authors.initials: H
authors.lastname: Zhao
authors.affiliation: Key Laboratory of Tropical Biological Resources of Ministry of Education, Hainan University, Haikou 570228, China. wangguizhen0@hotmail.com.
authors.forename: Xinyue
authors.initials: X
authors.lastname: Li
authors.affiliation: Key Laboratory of Tropical Biological Resources of Ministry of Education, Hainan University, Haikou 570228, China. wangguizhen0@hotmail.com.
authors.forename: Kan
authors.initials: K
authors.lastname: Wang
authors.affiliation: Key Laboratory of Tropical Biological Resources of Ministry of Education, Hainan University, Haikou 570228, China. wangguizhen0@hotmail.com.
authors.forename: Lei
authors.initials: L
authors.lastname: Yu
authors.affiliation: Key Laboratory of Tropical Biological Resources of Ministry of Education, Hainan University, Haikou 570228, China. wangguizhen0@hotmail.com.
authors.forename: Xiange
authors.initials: X
authors.lastname: Peng
authors.affiliation: State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Qin
mesh_terms: D065966:Absorption, Physicochemical; D004574:Electromagnetic Fields; D005290:Ferric Compounds / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*; D010316:Particle Size; D013499:Surface Properties; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D005290:Ferric Compounds; C000499:ferric oxide; D015034:Zinc Oxide