Tailoring optical and electrical properties of PVP-I2 complexes through gamma irradiation-induced structural defect Engineering for optoelectronic applications

A.M. Elbasiony; Mohamed Madani; Mohamed Mohamady Ghobashy; Mohamed Shaban; Sarah Alharthi; Samera Ali Al-Gahtany; Nora Hamad Al-Shaalan; Waleed E. Boraie; Mohamed S. Attia; Sana F. Abaza; Aiyeshah Alhodaib; A.I. Sharshir

Results in Chemistry (Oct 2024)

Tailoring optical and electrical properties of PVP-I2 complexes through gamma irradiation-induced structural defect Engineering for optoelectronic applications

A.M. Elbasiony,
Mohamed Madani,
Mohamed Mohamady Ghobashy,
Mohamed Shaban,
Sarah Alharthi,
Samera Ali Al-Gahtany,
Nora Hamad Al-Shaalan,
Waleed E. Boraie,
Mohamed S. Attia,
Sana F. Abaza,
Aiyeshah Alhodaib,
A.I. Sharshir

Affiliations

A.M. Elbasiony: Department of Chemistry, College of Science, Northern Border University (NBU), Arar, Saudi Arabia; Physical Chemistry Department, Electrochemistry and Corrosion Laboratory, National Research Centre, El Bohoth St. 33 Dokki, Giza, Egypt
Mohamed Madani: College of Science and Humanities- Jubail, Imam Abdulrahman Bin Faisal University, Jubail, Saudi Arabia
Mohamed Mohamady Ghobashy: Radiation Research of Polymer Chemistry Department, National Center for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Cairo, Egypt
Mohamed Shaban: Department of Physics, Faculty of Science, Islamic University of Madinah, Madinah 42351, Saudi Arabia; Corresponding authors.
Sarah Alharthi: Department of Chemistry, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
Samera Ali Al-Gahtany: Faculty of Science, University of Jeddah, Jeddah, Saudi Arabia
Nora Hamad Al-Shaalan: Department of Chemistry, College of Science, Princess Nourah bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia
Waleed E. Boraie: Department of Chemistry, College of Science, King Faisal University, P.O. Box 400, Al-Ahsa 31982, Saudi Arabia
Mohamed S. Attia: Chemistry Department, Faculty of Science, Ain Shams University, Abbassia, Cairo 11566, Egypt
Sana F. Abaza: Physics Department, Faculty of Science, Alexandria University, Alexandria, Egypt
Aiyeshah Alhodaib: Department of Physics, College of Science, Qassim University, Buraydah 51452, Saudi Arabia
A.I. Sharshir: Solid State and Electronic Accelerators Department, National Center for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Cairo, Egypt; Corresponding authors.

Journal volume & issue: Vol. 11
p. 101827

Abstract

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This study investigates the complexation of iodine with polyvinylpyrrolidone (PVP) subjected to gamma irradiation at doses of 0, 10, 20, and 30 kGy. The complex formation involves I2 acting as a Lewis acid with electron-rich PVP as a Lewis base through a charge transfer mechanism. UV–visible spectroscopy revealed a red shift of the absorption peak at 337 nm for irradiated PVP-I2 samples, indicating stronger interactions between the triiodide ion (I3¯) and irradiated PVP. FTIR analysis confirmed the formation of new C≡N moieties arising from PVP-I2 complexation. The FT-Raman analysis revealed a new C≡N peak at 2360 cm−1 in irradiated PVP-I2 samples, with increasing intensity correlating to higher irradiation doses, indicating enhanced electron delocalization due to complex formation. XRD analysis showed that PVP-I2 samples irradiated at 0 and 10 kGy exhibited higher crystallinity than those irradiated at 20 and 30 kGy, suggesting that high-dose irradiation causes PVP radiolysis and ring opening. Dielectric measurements demonstrated enhanced polarizability and ionic conductivity of irradiated PVP-I2 films, related to structural disorder promoting charge dissociation and ion mobility. The direct bandgap decreased from 2.75 eV for unirradiated samples to 2.55 eV for samples irradiated at 30 kGy, indicating the creation of new optically active defect states. Urbach energy increased from 0.85 eV to 1.55 eV with increasing irradiation dose, confirming increased disorder in the PVP structure. These findings reveal that gamma irradiation significantly alters the optical and electrical properties of PVP-I2 films by creating defects and disrupting structure, offering new insights for tailoring these materials for optoelectronic applications.

Published in Results in Chemistry

ISSN: 2211-7156 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Science: Chemistry
Website: https://www.journals.elsevier.com/results-in-chemistry/

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