Preparation and Microwave Absorbtion Performance of Composite Hollow Carbon/Fe3O4 Magnetic Quantum Dots

doi:10.11901/1005.3093.2021.334

Chinese Journal of Materials Research

2022, Vol. 36

Issue (1): 29-39 DOI: 10.11901/1005.3093.2021.334

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Preparation and Microwave Absorbtion Performance of Composite Hollow Carbon/Fe₃O₄ Magnetic Quantum Dots

CHEN Guanzhen¹, CHEN Ping¹^,²(

), XU Dongwei¹, MIN Weixing¹

^1.State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
^2.Key Laboratory of Materials Modification by Laser, Ion and Electron Beams of Ministry of Education, Dalian University of Technology, Dalian 116024, China

Cite this article:

CHEN Guanzhen, CHEN Ping, XU Dongwei, MIN Weixing. Preparation and Microwave Absorbtion Performance of Composite Hollow Carbon/Fe₃O₄ Magnetic Quantum Dots. Chinese Journal of Materials Research, 2022, 36(1): 29-39.

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Abstract

The composite of hollow carbon/Fe₃O₄ magnetic quantum dots (C/MQDs) was synthesized via in-situ polymerization-solvothermal-calcination process with silicon dioxide as the template. The morphology, crystallographic structure, chemical composition, intrinsic structural defects, relative graphitization degree and electromagnetic parameters of the prepared composite C/MQDs were characterized by means of SEM, TEM, Raman spectroscopy, XRD, XPS and Vector network analyzer (VNA) etc. It follows that electromagnetic parameters of the prepared C/MQDs could be adjusted by changing the addition amount of ferric nitrate so that to adjust its microwave absorption (MA) performance. In fact, a hollow ring made of the mixed composite and paraffin with 7 mm in outer diameter and 2.55 mm in thickness presented a maximum effective absorption bandwidth (EAB) of 7.06 GHz and a minimum reflection loss value (RL_min) of -43 dB. The excellent microwave absorption performance of the prepared composite is mainly derived from its electromagnetic matching characteristics and the synergistic effect of dielectric-magnetic loss.

Key words: composite microwave absorbing materials solvothermal X-band hollow structure

Received: 28 May 2021

ZTFLH:

TB332

Fund: the Liaoning Revitalization Talents Program(XLYC1802085);National Natural Science Foundation of China(51873109);Fundamental Research Funds for the Central Universities(DUT20TD207);Dalian Science and Technology Innovation Fund Project(2019J11CY007);Key Laboratory of Materials Modification by Laser, Ion and Electron Beams of Ministry of Education(KF2004)

About author: CHEN Ping, Tel: (0411)84986100, E-mail: pchen@dlut.edu.cn

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https://www.cjmr.org/EN/10.11901/1005.3093.2021.334 OR https://www.cjmr.org/EN/Y2022/V36/I1/29

Fig.1 Schematic illustration for the preparation of C/MQDs

Fig.2 XRD patterns of as-prepared H-C, H-C@Fe-G and C/MQDs microspheres

Fig.3 Raman spectra of H-C and C/MQDs-x

Fig.4 Hysteresis loop of C/MQDs-x and its enlarge view

Fig.5 XPS survey scan (a), Fe 2p (b), C 1s (c) and O 1s (d) high resolution spectrum for C/MQDs-2

Fig.6 SEM images of H-C (a, b, c), H-C@Fe-G (d, e, f) and C/MQDs-2 (g, h, i)

Fig.7 TEM images and EDS element mapping of C/MQDs

Fig.8 Contours of reflection loss in the frequency range of 1~18 GHz with varied thickness from 1.5~5.0 mm (a, c, e) and (b, d, f) reflection loss of three samples with 15% (mass fraction) C/MQDs-xvs thickness

Fig.9 Minimum RL values at specific thickness of different kinds of Fe₃O₄/C hybrids (a) and the corresponding EAB at RL_min of different kinds of Fe₃O₄/C hybrids (b)

Fig.10 ε′ (a), ε″ (b), tanδ_ε(c) and Cole-Cole semicircles (d) of C/MQDs-x

Fig.11 μ′ (a), μ″ (b), tanδ_μ (c) and eddy-current loss (d) of C/MQDs-x

Fig.12 Attenuation constant (a), modulus of Z_in-1 of various samples (b) with a thickness of 2.5 mm in the frequency range of 1~18 GHz, dependence of matching thickness (t_m) and calculated thickness on matching frequency (f_m) at the wavelength of 1/4 (c)

Fig.13 Absorbing mechanism of C/MQDs composites

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