Solid State Science and Technology, Vol. 16, No 1 (2008) 114-123
Corresponding Author: firstname.lastname@example.org
SYNTHESES OF CONDUCTING POLYMERS AND METAL NANOPARTICLES BY USING IONIZING RADIATION
E. B. Saion1, A.H. Shaari1, M. A. Ali1, M. Y. Hussain1,
Ghazanfar Mirjalili1,3 and K. Dahlan2
1Department of Physics, Faculty of Science,
Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
2Malaysian Nuclear Agency (MNA), 43000, Bangi, Selangor, Malaysia
3Physics Department, Faculty of Science,Yazd University,
P.O.Box 89195-741 Yazd, Iran.
Conducting polymer polyaniline was synthesized by radiation method from casting films containing polyvinyl alcohol (PVA) blended with aniline hydrochloride. Upon ã- irradiation the films changed to PVA/polyaniline nanoparticles as shown by the SEM surface morphology. The UV-Visible spectrophotometer measurement revealed the absorption band of polyaniline peaking at 790 nm due to ð . ð* electronic transitions of conducting polyaniline molecules (polyemeraldine based) from donor atoms (HOMO) to acceptor atoms (LUMO). The band gap decreases from 1.15 eV at 0 kGy to 1.0 eV at 50 kGy indicating the conductivity of polyaniline increases with the increase of dose.
Nanocomposites of PVA/Ag0 nanoparticles were synthesized under ambient condition by ã radiation from composite of PVA/silver nitrate. The UV-vis spectroscopy revealed the absorbance peaking at 425 due to the plasmon transitions at the conduction band of Ag0 nanoparticles. The absorbance increases with dose indicating an increase of the number of Ag0 nanoparticles formed. The absorption peak shifted from 425 nm to 415 nm corresponds to a decrease in the diameter of Ag0 nanoparticles with increasing dose. The band gap of the PVA/Ag0 nanoparticles increases with increasing dose indicating the gap of conduction band of Ag0 nanoparticles increases as the diameter of Ag0 nanoparticles decreases.
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