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167
SYTHESIS OF ZnO@NiCo
2
O
4
NANOWIRES BY A HYDROTHERMAL
METHOD
Saidov K.
1,2
*, Hoshimov F.
1
, Butanov K.
1
, Razzokov J.
1
,
Ruzimuradov O.
3,4
Mamatkulov Sh.
1
1
Institute of Material Science, Academy of Sciences of the Republic of Uzbekistan,
2
Department of Materials Science, Tashkent state Technical University,
3
Department of Chemistry, National University of Uzbekistan,
4
Department of Natural and Mathematic Sciences, Turin Polytechnic University in Tashkent,
Email:k.saidov@skku.edu
It is a common knowledge that the mechanical energy is one of the enormous as
well as reachable energy types in nature.
a
In order to exploit the available mechanical
energy the various options have been offered, e.g., electrostatic effect,
electromagnetic fields, triboelectric effect and piezoelectric effect.
b
Thus,
piezoelectric materials have to maintain the high efficiency on production of
electricity to apply for selfpowered electronics. The previous studies have been
confirmed that ZnO nanoflakes (NFs) as a piezoelectric material has showed
reasonable results for powering portable electronic devices.
c,d
In order to synthetize NiCo
2
O
4
nanowires on ZnO NFs, all the necessary
reagents such as pure zinc acetate dehydrate [Zn (CH
3
COO)
2
·2H
2
O], NCO, sodium
hydroxide (NaOH), and the substrate were purchased. Initially, 5-mM zinc acetate
dihydrate solution was used to obtain the seed layer of the substrate. Further, to
acquire the uniform growth of ZnO NFs on the substrate, we have baked the layer by
applying of 100
C temperatures for 10 minutes. To achieve the uniform coating the
procedure has repeated two times. Next, the prepared mixture of 5 mL of 1 M zinc
acetate aqueous solution and 5 mL of 8 M NaOH aqueous solution was stirred 3 min.
Then, it was diluted in a 200 mL aqueous solution and followed by stirring for 3 min
20 sec. The substrate was cleaned by means of deionized water and consequently
kept on a hot plate for 2 hours at 160
C. As a result, we have successfully
synthesized ZnO NFs. Subsequently, we have annealed ZnO NFs for 5 min at 80
C
after cleaning the latter. In order to prepare a solution we make use of 0.14 g
CoCl
2
•6H
2
O, 0.38 g NiCl
2
•6H
2
O, 0.108 g urea and 0.17 g NH
4
F dissolved in 30 mL
deionized water. The solution further stirred for 25 min at room temperature. After
obtaining a homogeneous solution, it was displaced to autoclave where was heated at
120
C for 10 h together with ZnO NFs. Thus, the hydrothermal method allowed us
to grow NiCo
2
O
4
NWs on the ZnO NFs substrate (see Figure 1).
The similar types of nanostructures were basically made use of fabricate novel
types of supercapacitors and piezoelectric materials. Thus, our fabricated
nanomaterial also might be used for energy storage purposes as a supercapacitor or
nanogenerators for self-powered electronic devices.
e
168
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