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Nickel-carbon nanocomposite: a dependence of the morphology on temperature and time of the solid-
state pyrolysis
R.Khachaturyan, A.Manukyan, A.Mirzakhanyan, H.Gyulasaryan, E.SharoyanInstitute for Physical Research of NAS of Armenia, Ashtarak, Armenia
E.Kaniukov, A.Petrov, D.YakimchukScientific-Practical Materials Research Centre of NAS of Belarus, Minsk, Belarus
Applications
Biomedicine Vehicles Solar cells
Catalysts Sensors Aerospace
Methods of nanoparticle synthesis
• Laser ablation
• Chemical vapor deposition (CVD)
• Chemical methods
Advantages of solid-phase pyrolysis
• Cheap materials for synthesis
• One-stage process
• Easy shape and size control
Solid-phase pyrolysis
M (C32N8H16 M + 32C
M = Fe, Co, Ni, Cu, Mg
Tpyr – temperature of pyrolysis
tpyr – time of pyrolysis
p – pressure in the chamber
22 4,8
,,
NH
ptT pyrpyr
Pyrolysis products
Spheres
C K 10 µm
1,0 1,5 2,0 2,5 3,0 3,5 4,0 4,5 5,0
0
2
4
6
8
10
12
De
lta
(%
)
d (m)
20 30 40 50
C (101)
C (002)
2degrees
Ин
тен
сивн
ост
ь,
от.
ед
.
Nanoparticles compacted in the matrix
3.0 µm
20 30 40 50
Ин
тен
сивн
ост
ь, от.
ед
.
Cu (200)
Cu (111)
2degree
C (002)
0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00
keV
0
40000
80000
120000
160000
200000
240000
280000
320000
360000
400000
440000
Co
un
ts
CK
aN
Ka
OK
a
Cu
LlC
uL
a
Cu
Ka
Cu
Kb
Nanotubes
1.0 µm
0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00
keV
0
50000
100000
150000
200000
250000
300000
350000
400000
450000
500000
Co
un
ts
CK
aN
Ka
OK
aN
iLl N
iLa
NiK
esc
NiK
a
NiK
b
InM
InL
l InL
aIn
Lb
InL
b2
InL
rIn
Lr2
,
20 30 40 50
Ин
тен
си
вн
ость,
от.
ед
.
Ni (200)
Ni (111)
C (002)
2degrees
Three different phases
10 µm
Changе of catalyst
Control of particles size and morphology by a variation of metal concentration
X-ray diffraction and average particle size
0 20 40 60 80 100
Ni (311)
Inte
nsi
ty,
arb
. u
nit
s
S3
S2
S1.5
S1
S2.5
2, degrees
S0.75
C (002)
Ni (111)
Ni (200)
Ni (220)
Magnetization of samples with0.75, 2, 3 at.% Ni content
-40 -20 0 20 40-6
-4
-2
0
2
4
6
H, kOe
M,
emu
/gN
i
300 K
200 K
100K
50K
40K
30 K
20K
10 K
S0.75
-40 -20 0 20 40-20
-15
-10
-5
0
5
10
15
20
S2
H, kOe
M,
em
u/g
Ni
300 K
200K
100K
50K
40K
30 K
20K
10 K
-40 -20 0 20 40
-20
-15
-10
-5
0
5
10
15
20 S3
H, kOe
M, e
mu/
gN
i
300 K
200K
100K
50K
40K
30 K
20K
10 K
Magnetization of samples with0.75, 2.5 at.% Ni content
-1000 -500 0 500 1000-1,0
-0,5
0,0
0,5
1,0
H, Oe
M,
em
u/g
Ni
300 K
200 K
100K
50K
40K
30 K
20K
10 K
S0.75
-1000 -500 0 500 1000-4
-2
0
2
4
M,
emu
/gN
i
S2,5
H, Oe
300 K
200K
100K
50K
40K
30 K
20K
10 K
Saturation magnetization of samples with 0.75, 2, 3 at.% Ni content
depends on temperature
0 50 100 150 200 250 300
0
5
10
15
20
M,
emu
/gN
i
T, K
S3
S2
S0,75
H = 45kOe
Coercive force of samples with 0.75, 2, 3 at.% Ni content depends on temperature
0 50 100 150 200 250 3000
50
100
150
200
250
300
Hc, O
e
T, K
S0.75
S2
S3
FMR of samples with 0.75, 2, 3 at.% Ni content
Size and morphology control by variation of temperature and time of
pyrolysis
Application for a creation of supercapacitors
Application for magnetic hyperthermia
-5 0 5 10 15 20 25 30 35 40
20
30
40
50
60
70
80
90
1ml water
75 kA/m, 228 kHz
2ml water
75 kA/m, 228 kHz
Te
mp
era
ture
, oC
Time, min
2ml water
150 kA/m, 228 kHz
Conclusions
By the solid-phase pyrolysis method can be controlled the following:
• Size of nanopraticles
• Morphology of nanocomposites
• Magnetic properties of nanocomposites
Carbon coating provides:
• Protection from oxidation
• Prevention of nanoparticles agglomeration
• Biocompatibility
Conclusions
Thank you for attention!
This work was supported in frames of the collaborative research project of the State Committee on Science of the Ministry of Education and Science of Armenia and the
Belarusian Republican Foundation for Fundamental Research No. Ф12АРМ-020