|
| |
FIZIKA A 9 (2000) 4 , 147-152
 
OPTICAL PROPERTIES OF POLYANILINE SALT AND POLYANILINE BASE WITH KBr,
Co(CH3COO)2 AND PICRIC ACID COMPOSITES
W. M. SAYEDa and L. I. SOLIMANb
aPetroleum Research Institute, Nasr City, Cairo, Egypt
bNational Research Centre, Solid State Phys. Dept., Dokki, Cairo, Egypt
Received 3 November 1999; revised manuscript received 11 January 2000
Accepted 12 February 2001
Polyaniline was prepared by chemical methods. The composites were prepared by the hot
pressing of polyaniline base with different percentages of KBr, Co(CH3COO)2
and picric acid. The diffused reflectance of polyaniline doped with 10, 15, 25 and 50 wt%
of KBr, picric acid and cobalt acetate, was measured at room temperature in the wavelength
range from 500 to 1800 nm. The energy gaps of the samples were then deduced as well as the
position and number of the indirect transitions which were found to be dependent on the
concentration percentage of the doping materials. The energy gaps of all samples decrease
by increasing the concentration percentage of the doping materials.
PACS numbers: 78.40.-q, 81.05.Qk
UDC 535.391, 535.661
Keywords: polyaniline composites, doping with KBr, picric acid and cobalt acetate,
energy gaps, indirect transitions
|
