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  DOI Prefix   10.20431


 

International Journal of Advanced Research in Chemical Science
Volume 5, Issue 12, 2018, Page No: 24-32

Melanin Doping Potential Effect on the Optical Properties Polyvinyl Alcohol

Baderia Awad1,*, Ammany A Aly 1,2, Magdy M. Ghannam1,2

1.Department of Physics and Astronomy, King Saud University, Riyadh, Saudi Arabia.
2.Biophysics Department, Faculty of Science, Cairo University, Giza, Egypt.

Citation : Baderia Awad,et.al, Melanin Doping Potential Effect on the Optical Properties Polyvinyl AlcoholInternational Journal of Advanced Research in Chemical Science 2018, 5(12) : 24-32.


Abstract

PVA (polyvinyl alcohol) was the common biopolymer that used in medical applications due to its unique properties. Melanin is widely distributed in the most all living organisms and displays the photo-protection, metal ion chelation, antibiotic, antibiotic activity, thermoregulation, free radical scavenging and some involvement in the nervous system. The aim of work provided a new biomaterial that had unique properties in optical applications. The absorbance increased with increasing concentration of melanin. The optical density data show that the absorbance band of PVA shifts from 280nm after doping by melanin to 272 for all concentration. The energy gap of pure PVA was 5.2 eV and reduced to 3.42 eV as melanin concentration increases up to 4%. The fluorescence emission spectra of pure PVA and PVA-Mel in different concentration at excitation wavelength λex = 280nm show emission peaks λem at 307, 333, and 405 nm. Emission spectra for all samples of PVA-Mel were shifted toward long wavelength (red shift). FTIR was measured in the range of 4000 - 400 cm-1 for all studied samples. The data indicate that melanin has two peaks; broad with 3256.07cm-1 and the second is sharp with 1635.01cm-1 . Pure PVA and PVA- Melanin shows that there are two peaks for PVA; the first is broad with 3307.05cm-1 and the second is sharp with 1638.87cm-1 . Doping Melanin with different concentration indicates a peak shift.


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