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EFFECT OF TEMPERATURE ON THE ELECTRICAL CONDUCTIVE PROPERTIES
OF POLYANILINE
Shonazarova Nargiza Ulug`bek kizi
Master's student of the Department of Teaching Methods of
Exact and Natural Sciences (Chemistry) at Navoi State University
To’xtayev Feruz Sadulloyevich
Doctor of Technical Sciences (DSc), Professor of the Department of
Chemistry Teaching Methods, Navoi State University
Abstract:
This in research polyaniline electricity conductivity temperature impact experimental
accordingly was studied. Experiments were conducted from −50°C to 300°C. was temperature
between take went. Results this showed that the temperature increase with electricity
conductivity initially exponential accordingly increases,but above 200°C at temperatures
polyaniline to degradation occurs and permeability sharp decreases. At low temperatures and of
electrons kinetic of energy decrease as a result conductivity decrease observed.
Research results polyaniline temperature sensors,supercapacitors and energy storage in systems
application opportunities to expand help gives.
Keywords:
polyaniline, electrical conductivity, temperature, dopants, semiconductor,
degradation.
INTRODUCTION
Polyaniline (PANI) - electrical conductivity with separated standing organic polymer mold,
electronics, energy storage in systems and sensor technologies wide is used. Its electricity
features temperature, dopants, molecular structure and exterior physicochemical to the
conditions related. Electricity conductivity in terms of polyaniline metal and semiconductor
materials between intermediate position occupies and various physicist effects under noticeable
to changes occurs.
This in research polyaniline electricity conductivity temperature impact studied, temperature
increase and decrease under the circumstances face giving physicochemical processes analysis
Research
results polyaniline future electronic devices, sensors and energy storage in
systems application opportunities deep to understand help gives.
II. METHODS
1.Material preparation :
Polyaniline sample chemical oxidation polymerization method with
prepared. Protonation process for sulfuric (H₂SO₄) and phosphoric (H₃PO₄) acids as dopants used.
Dopants type polyaniline electricity conductivity noticeable impact showed.
2. Electrical conductivity Dimensions :
Polyaniline electricity conductivity from −50°C to
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300°C was temperature between. The measurements were made using direct and alternating
current methods.
The electrical resistance
(R)
was determined and the electrical conductivity was calculated using
the following formula:
Temperature (°C)
Electrical conductivity (S/cm)
-50
0.002
0
0.01
50
0.05
100
0.2
150
0.8
200
1.5
250
0.7
300
0.1
3. Thermal and structural analysis
The temperature-dependent degradation process was studied using
differential thermal
analysis (DTA) and thermogravimetric analysis (TGA).
The degree of crystallinity and changes in the bond structure of polyaniline were
monitored by
X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR)
methods.
III. RESULTS
1. Increase in electrical conductivity with increasing temperature.
In the range of 50-150°C,
the electrical conductivity of polyaniline increased exponentially. This is due to the increase in
electron mobility and the activation of dopants, and is described by the Arrhenius equation:
Here
- activation energy, – Boltzmann is a constant and is the temperature.
2. Excessive at temperature degradation:
above 200-300°C at temperature polyaniline
structure broken,electric conductivity sharp decreased. Thermal analysis results polymer initial
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temperature at 250°C to degradation meet showed.
3. At low temperatures electricity conductivity decrease:
at temperatures below −50°C
electricity conductivity noticeable at the level decrease observed. These electrons kinetic of
energy attenuation and conductivity of the roads contraction with depends.
4. Dopants Effect:
Sulphate acid with protonated polyaniline samples phosphate acidic to
samples relatively high electricity stability showed that the dopants nature polyaniline
crystallinity level and conductivity to the mechanisms impact showed.
IV. DISCUSSION
Research results this shows that polyaniline electricity conductivity to the temperature related
without changes and is known temperature in the range maximum to the level enough. Electronic
mobility increase as a result conductivity increases, but high at temperature polymer degradation
to the surface is coming.
From this except at low temperatures of electrons kinetic energy decreasing, quantum effects
under the influence conductivity decreases. This features polyaniline temperature sensors,
supercapacitors and energy storage in systems application for important importance has.
V. CONCLUSION
Research results polyaniline various temperature in the ranges used electronics on devices
application opportunities open Research
this showed that polyaniline electricity
conductivity temperature to the range related without varies between 150-200°C maximum to
value enough. High at temperatures thermal degradation to the surface comes, at low
temperatures and kinetic of energy decrease because of conductivity decreases. Sulfate acidic
dopants high electricity stability provides.
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