Effect of Gamma irradiation on the nanofree volume and electrical properties of PVA/PEG/reduced graphene oxide nanocomposites
Abdelmaqsoud, D., Mohsen, M., Hassan, A., Ismail, A., Mahmoud, K., El sayed, F. (2019). Effect of Gamma irradiation on the nanofree volume and electrical properties of PVA/PEG/reduced graphene oxide nanocomposites. EKB Journal Management System, 52(4), 175-189. doi: 10.21608/ajnsa.2019.6282.1138
Dina Abdelmaqsoud; Mona Mohsen; Ashry Hassan; Ahmed M Ismail; Kamal R Mahmoud; Fatma El sayed. "Effect of Gamma irradiation on the nanofree volume and electrical properties of PVA/PEG/reduced graphene oxide nanocomposites". EKB Journal Management System, 52, 4, 2019, 175-189. doi: 10.21608/ajnsa.2019.6282.1138
Abdelmaqsoud, D., Mohsen, M., Hassan, A., Ismail, A., Mahmoud, K., El sayed, F. (2019). 'Effect of Gamma irradiation on the nanofree volume and electrical properties of PVA/PEG/reduced graphene oxide nanocomposites', EKB Journal Management System, 52(4), pp. 175-189. doi: 10.21608/ajnsa.2019.6282.1138
Abdelmaqsoud, D., Mohsen, M., Hassan, A., Ismail, A., Mahmoud, K., El sayed, F. Effect of Gamma irradiation on the nanofree volume and electrical properties of PVA/PEG/reduced graphene oxide nanocomposites. EKB Journal Management System, 2019; 52(4): 175-189. doi: 10.21608/ajnsa.2019.6282.1138

Effect of Gamma irradiation on the nanofree volume and electrical properties of PVA/PEG/reduced graphene oxide nanocomposites

Arab Journal of Nuclear Sciences and Applications
Article 19, Volume 52, Issue 4, October 2019, Page 175-189  XML PDF (1.32 MB)
Document Type: Original Article
DOI: 10.21608/ajnsa.2019.6282.1138
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Authors
Dina Abdelmaqsoud email 1; Mona Mohsen2; Ashry Hassan3; Ahmed M Ismail4; Kamal R Mahmoud5; Fatma El sayed6
1physics department, faculty of education, Ain shams university, cairo, Egypt
2Physics department, Faculty of Science, Ain Shams University, cairo, Egypt
3Physics department,Faculty of Education, Ain Shams University, cairo, egypt
4Physics department, Faculty of Education, Ain Shams University, Cairo, Egypt
5Physics Department, Faculty of science, Kafrelsheikh University, KafrelSheikh, Egypt
6Physics Department, Faculty of education. Ain shams university, cairo, Egypt.
Abstract
Reduced graphene oxide (RGO) doped polyvinyl alcohol/ Polyethylene glycol (PVA/PEG) films were prepared by solution casting technique and exposed to 100 kGy gamma radiation. The structural modifications in the samples before and after irradiation were studied using X-ray diffraction XRD, Fourier transform infrared spectroscopyFTIR anddifferential scanning calorimetry DSC. The free volume holes Vf determined from the o-Ps lifetime τ3measured by the positron annihilation spectroscopy (PALS) is found to decrease from (84.52 to 67.24Å3) and from (85.67 to 78.21 Å3) for nonirradiated and irradiated samples respectively with increasing the nanoscale RGO fillercontentto the polymer matrix. The resulting decrease of the free volume holes size due to this incorporation could be explained byboth the formation of hydrogen-bonding and crosslinking between RGO and PVA/PEG blend as confirmed byXRD and FTIR measurements. This also caused a decrease in the concentration of free volumes Fr for both nonirradiated and irradiated samples. The increased D.C. electrical conductivity with increasing RGOvolume fraction(0–0.265) suggests a conductivity chain formation through the nanoparticle aggregation. The deduced Ln σis found to be positively correlated with the probability of free annihilation of positrons I2, trapped at crystalline-amorphous interfaces. The D.C. conductivity results could be successfully fitted using the model suggested by Miyamoto and Shibayama. The critical free volumes for the charge carriers’ transport has been deduced to be 80.34 and 82.16Å3 for nonirradiated and irradiated samples respectively.
Keywords
Nanocomposites; Reduced Graphene oxide; gamma-radiation; free volume; Positron Annihilation; D.C. conductivity
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