Optical energy band gap of PAAm-GO composites
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Date
2018
Authors
Evingür, Gülşen Akin
Pekcan, Önder
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier Science
Abstract
Graphene oxide (GO) can be used as an electron acceptor for polymers. The generation of the exciton in such materials is intimately related to the optical band gap. Polyacrylamide (PAAm) - graphene oxide (GO) composites were prepared via free radical crosslinking copolymerization with GO content varying in the range between 5 and 40 mu l of GO. The influence of the GO content on the optical properties of the composites is characterized by ultraviolet visible spectrophotometer. The optical band gap of the composite has been calculated by using Tauc's model. The tail width of the localized states has been calculated by using Urbach's relation and the values of Urbach's energy with the variation of GO have been found from 289 to 296 eV. The results demonstrated that GO can be well dispersed in the PAAm-GO composites and consequently the optical band gap has been correlated with the various amounts of GO. (C) 2017 Elsevier Ltd. All rights reserved.
Description
Keywords
Polyacrylamide (PAAm), Graphene oxide (GO), UV-vis spectrum, Absorbance, Energy band gap
Turkish CoHE Thesis Center URL
Citation
37
WoS Q
Q1
Scopus Q
Q1
Source
Volume
183
Issue
Start Page
212
End Page
215