Superb electromagnetic wave-absorbing composites based on large-scale

graphene and carbon nanotube films

Jinsong Li1,2, Weibang Lu3, Jonghwan Suhr4, Hang Chen5, John Q. Xiao5 and Tsu-Wei Chou2★

1 School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China.

2 Department of Mechanical Engineering, University of Delaware, Newark, DE 19716, United

States.

3 Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123,

China.

4 Department of Polymer Science and Engineering, Sungkyunkwan University, Suwon 440-746,

Republic of Korea.

5 Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, United States.

★ Corresponding author email: chou@udel.edu

Supplementary Note 1. SEM images of CNT film and CNT-Fe3O4-graphene film.

Supplementary Figure 1| (a) SEM image of CNT film. (b) SEM image of CNT-Fe3O4-graphene

film.

Supplementary Note 2. Process of the CNT film-Fe3O4-grpahene composite.

Supplementary Figure 2| Schematic of the process of the CNT film-Fe3O4-graphene composite.

Supplementary Note 3. CNT film has good wettability with ethylene glycol, CNT film was

completely immersed in the reaction solution.

Supplementary Figure 3| Photo images of (a) wettability of CNT film with ethylene glycol and (b)

CNT film immersed in ethylene glycol.

Supplementary Note 4. Relative complex permittivity and permeability of the CNT film-Fe3O4

composites with one, two, three, four, five, six and seven layers prepared from 0.05 M FeCl3.

0 2 4 6 8 10 12 14 16 180

5

10

15

20

25

30

35

Rea

l per

mit

tivi

ty

Frequency (GHz)

CNT film-Fe3O

4-1layer

CNT film-Fe3O

4-2layers

CNT film-Fe3O

4-3layers

CNT film-Fe3O

4-4layers

CNT film-Fe3O

4-5layers

CNT film-Fe3O

4-6layers

CNT film-Fe3O

4-7layers

a

0 2 4 6 8 10 12 14 16 180

5

10

15

20

25

Imag

inar

y pe

rmit

tivi

ty

Frequency (GHz)

b

0 2 4 6 8 10 12 14 16 180.5

1.0

1.5

2.0

Rea

l per

mea

bili

ty

Frequency (GHz)

c

0 2 4 6 8 10 12 14 16 18-0.5

0.0

0.5

1.0

Imag

inar

y p

erm

eabi

lity

Frequency (GHz)

d

Supplementary Figure 4| (a) real and (b) imaginary parts of the complex permittivity; (c) real and

(d) imaginary parts of complex permeability of the CNT film-Fe3O4 composites with one, two, three,

four, five, six and seven layers prepared from 0.05 M FeCl3.

Supplementary Note 5. Relative complex permittivity and permeability of the CNT film-Fe3O4

composites with six-layers prepared from 0.01, 0.02, 0.03, 0.04, 0.05 and 0.10 M FeCl3.

0 2 4 6 8 10 12 14 16 180

5

10

15

20

25

30

Rea

l per

mit

tivi

ty

Frequency (GHz)

CNT film-Fe3O

4-0.01M

CNT film-Fe3O

4-0.02M

CNT film-Fe3O

4-0.03M

CNT film-Fe3O

4-0.04M

CNT film-Fe3O

4-0.05M

CNT film-Fe3O

4-0.10M

a

0 2 4 6 8 10 12 14 16 180

2

4

6

8

10

12

Imag

inar

y pe

rmitt

ivity

Frequency (GHz)

b

0 2 4 6 8 10 12 14 16 180.6

0.9

1.2

1.5

Rea

l per

mea

bili

ty

Frequency (GHz)

c

0 2 4 6 8 10 12 14 16 18-0.5

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

0.5

Imag

inar

y p

erm

eabi

lity

Frequency (GHz)

d

Supplementary Figure 5| (a) real and (b) imaginary parts of the complex permittivity; (c) real and

(d) imaginary parts of complex permeability of the CNT film-Fe3O4 composites with six-layers

prepared from 0.01, 0.02, 0.03, 0.04, 0.05 and 0.10 M FeCl3.

Supplementary Note 6. Relative complex permittivity and permeability of the CNT film-Fe3O4

-0.04 M-LSG composites with one, two, three, four, five and six layers of graphene.

0 2 4 6 8 10 12 14 16 180

5

10

15

20

25

30

35

40

45

50

Rea

l per

mea

bili

ty

f (GHz)

CNT film-Fe3O

4-4-1L LSG

CNT film-Fe3O

4-4-2L LSG

CNT film-Fe3O

4-4-3L LSG

CNT film-Fe3O

4-4-4L LSG

CNT film-Fe3O

4-4-5L LSG

CNT film-Fe3O

4-4-6L LSG

a

0 2 4 6 8 10 12 14 16 180

5

10

15

20

25

Imag

inar

y pe

rmea

bili

tyf (GHz)

b

0 2 4 6 8 10 12 14 16 180.5

1.0

1.5

Rea

l per

mit

tivity

f (GHz)

c

0 2 4 6 8 10 12 14 16 18-1.0

-0.5

0.0

0.5

Imag

inar

y pe

rmit

tivity

f (GHz)

d

Supplementary Figure 6| (a) real and (b) imaginary parts of the complex permittivity; (c) real and

(d) imaginary parts of complex permeability of the CNT film-Fe3O4 -0.04 M-LSG composites with

one, two, three, four, five and six layers of graphene.