Impact of natural melanin doping on the structural, optical and dielectric characteristics of the PVP/CMC blend
Undoped and doped polyvinyl pyrrolidone/ carboxymethyl cellulose (PVP/CMC: 50/50%) blended polymers with melanin were formed. X-ray diffraction analysis confirmed the amorphous nature of all blends. Scanning electron microscopy results confirmed the smooth and homogeneous surface of the undoped and...
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| Format: | Article |
| Language: | English |
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Taylor & Francis Group
2023-12-01
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| Series: | Journal of Taibah University for Science |
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| Online Access: | https://www.tandfonline.com/doi/10.1080/16583655.2023.2190731 |
| _version_ | 1827288126319493120 |
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| author | A. M. El-naggar Zein K. Heiba A. M. Kamal Khalid E. Alzahrani Omar H. Abd-Elkader Mohamed Bakr Mohamed |
| author_facet | A. M. El-naggar Zein K. Heiba A. M. Kamal Khalid E. Alzahrani Omar H. Abd-Elkader Mohamed Bakr Mohamed |
| author_sort | A. M. El-naggar |
| collection | DOAJ |
| description | Undoped and doped polyvinyl pyrrolidone/ carboxymethyl cellulose (PVP/CMC: 50/50%) blended polymers with melanin were formed. X-ray diffraction analysis confirmed the amorphous nature of all blends. Scanning electron microscopy results confirmed the smooth and homogeneous surface of the undoped and doped PVP/CMC blend with melanin. The optical parameters and fluorescence spectra of the PVP/CMC blend were investigated as functions of melanin content. The direct optical band gap (Eg) for the used melanin is 2.86 eV. The direct and indirect Eg values for the PVP/CMC blend are 5.1 and (4.9, 3.2) eV, respectively. The direct and indirect Eg values were reduced to (4.5, 3.23) and (2.2, 1.33) eV as the amount of melanin became 3 wt % in the doped blend. The effect of melanin doping on the dielectric constant, dielectric loss, AC conductivity, complex impedance, Nyquist plot of the complex impedance, and electric modulus of the PVP/CMC blend was also studied. |
| first_indexed | 2024-03-10T08:13:37Z |
| format | Article |
| id | doaj.art-5fe5b271964c46b79c5cf7df023f48a2 |
| institution | Directory Open Access Journal |
| issn | 1658-3655 |
| language | English |
| last_indexed | 2024-04-24T11:25:34Z |
| publishDate | 2023-12-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | Journal of Taibah University for Science |
| spelling | doaj.art-5fe5b271964c46b79c5cf7df023f48a22024-04-10T20:17:48ZengTaylor & Francis GroupJournal of Taibah University for Science1658-36552023-12-0117110.1080/16583655.2023.2190731Impact of natural melanin doping on the structural, optical and dielectric characteristics of the PVP/CMC blendA. M. El-naggar0Zein K. Heiba1A. M. Kamal2Khalid E. Alzahrani3Omar H. Abd-Elkader4Mohamed Bakr Mohamed5Research Chair of Exploitation of Renewable Energy Applications in Saudi Arabia, Physics & Astronomy Department, College of Science, King Saud University, Riyadh, Saudi ArabiaPhysics Department, Faculty of Science, Ain Shams University, Cairo, EgyptPhysics & Astronomy Department, College of Science, King Saud University, Riyadh, Saudi ArabiaPhysics & Astronomy Department, College of Science, King Saud University, Riyadh, Saudi ArabiaPhysics & Astronomy Department, College of Science, King Saud University, Riyadh, Saudi ArabiaPhysics Department, Faculty of Science, Ain Shams University, Cairo, EgyptUndoped and doped polyvinyl pyrrolidone/ carboxymethyl cellulose (PVP/CMC: 50/50%) blended polymers with melanin were formed. X-ray diffraction analysis confirmed the amorphous nature of all blends. Scanning electron microscopy results confirmed the smooth and homogeneous surface of the undoped and doped PVP/CMC blend with melanin. The optical parameters and fluorescence spectra of the PVP/CMC blend were investigated as functions of melanin content. The direct optical band gap (Eg) for the used melanin is 2.86 eV. The direct and indirect Eg values for the PVP/CMC blend are 5.1 and (4.9, 3.2) eV, respectively. The direct and indirect Eg values were reduced to (4.5, 3.23) and (2.2, 1.33) eV as the amount of melanin became 3 wt % in the doped blend. The effect of melanin doping on the dielectric constant, dielectric loss, AC conductivity, complex impedance, Nyquist plot of the complex impedance, and electric modulus of the PVP/CMC blend was also studied.https://www.tandfonline.com/doi/10.1080/16583655.2023.2190731PVP/CMCMelaninopticaldielectric |
| spellingShingle | A. M. El-naggar Zein K. Heiba A. M. Kamal Khalid E. Alzahrani Omar H. Abd-Elkader Mohamed Bakr Mohamed Impact of natural melanin doping on the structural, optical and dielectric characteristics of the PVP/CMC blend Journal of Taibah University for Science PVP/CMC Melanin optical dielectric |
| title | Impact of natural melanin doping on the structural, optical and dielectric characteristics of the PVP/CMC blend |
| title_full | Impact of natural melanin doping on the structural, optical and dielectric characteristics of the PVP/CMC blend |
| title_fullStr | Impact of natural melanin doping on the structural, optical and dielectric characteristics of the PVP/CMC blend |
| title_full_unstemmed | Impact of natural melanin doping on the structural, optical and dielectric characteristics of the PVP/CMC blend |
| title_short | Impact of natural melanin doping on the structural, optical and dielectric characteristics of the PVP/CMC blend |
| title_sort | impact of natural melanin doping on the structural optical and dielectric characteristics of the pvp cmc blend |
| topic | PVP/CMC Melanin optical dielectric |
| url | https://www.tandfonline.com/doi/10.1080/16583655.2023.2190731 |
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