Ceram.Int.,2016,42,10682–Fe3O4@SnO2-RGO纳米复合材料的合成及吸波性能研究 姜炜 南京理工大学

Controlled synthesis of Fe3O4@SnO2/RGO nanocomposite for

microwave absorption enhancement

Yanping Wang,Zheng Peng,Wei Jiang n

National Special Superfine Powder Engineering Research Center,Nanjing University of Science and Technology,Nanjing210094,China

a r t i c l e i n f o

Article history:

Received24January2016

Received in revised form

9March2016

Accepted23March2016

Available online29March2016

Keywords:

C.Magnetic properties

Fe3O4@SnO2/RGO nanocomposite

Microwave absorption

Reflection loss

a b s t r a c t

A ternary nanocomposite of Fe3O4@SnO2/reduced graphene oxide(RGO)with different contents of SnO2

nanoparticles was synthesized by a simple and efficient three-step method.The transmission electron

microscopy andfield emission scanning electron microscopy characterization display that plenty of

Fe3O4@SnO2core–shell structure nanoparticles are well distributed on the surface of RGO sheets.The

X-ray diffractograms show that the products consist of highly crystallized cubic Fe3O4,tetragonal SnO2

and disorderedly stacked RGO sheets.The magnetic hysteresis measurement reveals the ferromagnetic

behavior of the products at room temperature.The microwave absorption properties of paraffin con-

taining50wt%products were investigated at room temperature in the frequency range of2–18GHz by a

vector network analyzer.The electromagnetic data show that the maximum reflection loss isÀ45.5dB

andÀ29.5dB for Fe3O4@SnO2/RGO-1and Fe3O4@SnO2/RGO-2nanocomposite,respectively.Meanwhile,

the reflection loss less thanÀ10dB is up to14.4GHz and13.8GHz for Fe3O4@SnO2/RGO-1and

Fe3O4@SnO2/RGO-2nanocomposite,respectively.It is believed that such nanocomposite could be used as

promising microwave absorbers.

&2016Elsevier Ltd and Techna Group S.r.l.All rights reserved.

1.Introduction

Recently,microwave absorbers have attracted extensive atten-

tion due to the serious electromagnetic interference(EMI)pollu-

tion arising from radar systems,local area network systems,var-

ious electronic devices,etc[1–3].The microwave absorber is a kind

of functional material which can absorb EM waves effectively,ei-

ther by making EM waves loss through interference or by con-

verting EM energy into thermal energy[4,5].An ideal microwave

absorber should exhibit wide absorption frequency range,strong

absorption properties,good thermal stability,antioxidant cap-

ability,low density and thickness.Unfortunately,the traditional

EM absorption materials cannot satisfy all of the requirements at

the same time.Hence,it should be promising and meaningful to

develop novel microwave absorption materials.

Reduced graphene oxide(RGO),a single layer of carbon atoms

tightly constructed into a two-dimensional honeycomb sp2carbon

lattice,has attracted ever-increasing attention for its unique phy-

sical and chemical properties.High dielectric and low density of

RGO make it very promising to be a lightweight microwave ab-

sorber.Nevertheless,the high conductive and electromagnetic

parameters of pure RGO cannot meet the requirement of

impedance match,which is harmful to its microwave absorption

[6,7].Recent researches show that RGO modified with inorganic

nanoparticles is believed to exhibit good microwave absorption

properties and can be used as microwave absorbing materials.

Zhang et al.[8]synthesized RGO–Fe3O4composite hydrogel at

room temperature conditions,and found the composite showed a

maximum absorption ofÀ47.9dB with a thickness of2.5mm at

10.1GHz.Zong and co-workers[9]synthesized RGO/CoFe2O4

composite by a simple hydrothermal route,the maximum reflec-

tion loss of the composite wasÀ47.9dB at12.4GHz for the

thickness of2.3mm,and the absorption bandwidth with reflec-

tion loss less thanÀ10dB was5.0GHz for a thickness of2.0mm.

Wu et al.[10]prepared3D-RGO/ZnO nanocomposite using a two-

step reduction process,the maximum effective absorption band-

width could reach6.4GHz with the thickness of the absorber was

2.5mm.Furthermore,the microwave absorption properties are

closely related with their microstructures.One-dimensional(1D)

core–shell nanostructures can improve the microwave absorption

properties due to the potential to combine the individual proper-

ties of each component and the formation of heterojunctions at

the interface[11,12].We have fabricated Fe3O4@SnO2[13]and

Fe3O4@SiO2@ZnO core–shell structures microspheres[14]and

observed the enhanced microwave absorption performance due to

the special structures.However,the absorption bandwidth with

reflection loss belowÀ10dB is narrow.Extensive studies[15,16]

have verified that core–shell structures nanoparticles decorated on

Contents lists available at ScienceDirect

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Ceramics International

/10.1016/j.ceramint.2016.03.180

0272-8842/&2016Elsevier Ltd and Techna Group S.r.l.All rights

reserved.

n Corresponding author.

E-mail address:climentjw@(W.Jiang).

Ceramics International42(2016)10682–10689