department of chemical H.Nurana, Q.Eldar

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22 Φεβ 2014 (πριν από 3 χρόνια και 3 μήνες)

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This work was carried by the master studentes of
department of chemical H.Nurana, Q.Eldar




Email:AynurAmrahova@gmail.com


Phone:+994505169529





Formation of CdS


nanoparticles

Here we shall report a convenient synthetic
method of CdS nanoparticles by ultrasonic
irradiation of a mixed solution of CdCl2,
Na2S2O3 and (CH3)2CHOH in Ar atmosphere
and the irradiotion of the powder of CdS in
distilled water.The whole process is carried at
room temperature and ambient pressure
.


Cadmium chloride(CdCL2
*
2.5
H2O
)
-

0.9 g


Sodium tiosulphate(Na2S2O3
*
5
H
2
O
)

-

1.2 g


Isopropyl alcohol((CH3)2CHOH))


24ml


Doubly distilled water
-

51 ml






ULTRASONİC VCX
-
500



Power


500W

20Khz

Formation mechanism of CdS

nanoparticles

Depositing CdS nanoparticles after a day

Dependence of (
α
hv)
٨
2
on energy of
fotons for CdS nanoparticles


The band gap energy of CdS
nanoparticles wich was obtained
from this experiment is:


Eg=3.7 ev and the size is 6,7 nm

The conseption of down to up.This is
the method of sedimentation.From
this flask we took part of this solution
in different hours and analysed it in
SPECORD250 UV
-
VIS.

Dependence of (
α
hv)
٨
2
on energy of

fotons for powder of CdS


The band gap energies corresponding to the
spectrum wich was shown in former slide in
different hours

Band gap
energy (
eV
)

Hour

Size(nm)

3,82

26

45

3,93

49

42

3,96

98

40

4,05

123

38

Ultrasonic irradiation has been successfully used to
prepare CdS nanoparticles at room temperature.The
advantage of this method is that it is a simple and
efficent way to produce nanoparticles, which could
find use in modern electronic and electrooptical
devices.By appropriate control of the different
surfactants, carriers and solvents, we predict that the
ultrasonic reduction method may be extended to the
preparation of metal sulfide semiconductor
nanoparticles in aqueous systems

The broad absorption band can be attributed to
a surface state of CdS nanoparticles, because the
absorption lies below the absorption edge of
the particles and the absorption energy is lower
than the band gap of the particles,which are
corresponding well to CdS particles as
previously reported

For this work we thank E.Gonche PH.D.
She is acknowledged for her help in all
measurements
.