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Open AccessArticle

Optical Properties of Composites Based on Graphene Oxide and Polystyrene

Laboratory Optical Processes in Nanostructure Materials, National Institute of Materials Physics, Atomistilor str. 405 A, 77125 Bucharest, Romania
Department of Chemical Engineering, Faculty of Chemistry and Chemical Engineering, Babes-Bolyai University, Arany Janos str. 11, 400028 Cluj-Napoca, Romania
Advanced Materials and Applied Technologies Laboratory, Institute of Research-Development-Innovation in Applied Natural Sciences, Babes-Bolyai University, Fantanele str. 30, 400294 Cluj-Napoca, Romania
Faculty of Physics, Babes-Bolyai University, M. Kogalniceanu str. 1, 400048 Cluj-Napoca, Romania
Fire Officers Faculty, “Alexandru Ioan Cuza” Police Academy, Morarilor str. 3, 022451 Bucharest, Romania
Author to whom correspondence should be addressed.
Academic Editor: Filippo Parisi
Molecules 2020, 25(10), 2419;
Received: 1 May 2020 / Revised: 16 May 2020 / Accepted: 18 May 2020 / Published: 22 May 2020
(This article belongs to the Special Issue Research on Nanostructured Materials)
In this work, new optical properties of composites based on polystyrene (PS) microspheres and graphene oxide (GO) are reported. The radical polymerization of styrene in the presence of benzoyl peroxide, pentane and GO induces the appearance of new ester groups in the PS macromolecular chains remarked through an increase in the absorbance of the infrared (IR) band at 1743 cm−1. The decrease in the GO concentration in the PS/GO composites mass from 5 wt.% to 0.5 wt.% induces a diminution in the intensities of the D and G Raman bands of GO simultaneous with a down-shift of the D band from 1351 to 1322 cm−1. These variations correlated with the covalent functionalization of the GO layers with PS. For the first time, the photoluminescent (PL) properties of PS/GO composites are reported. The PS microspheres are characterized by a PL band at 397 nm. Through increasing the GO sheets’ concentration in the PS/GO composite mass from 0.5 wt.% to 5 wt.%, a PS PL quenching process is reported. In addition, in the presence of ultraviolet A (UVA) light, a photo-degradation process of the PS/GO composite having the GO concentration equal to 5 wt.% is demonstrated by the PL studies. View Full-Text
Keywords: polystyrene microsphere; graphene oxide; composite; covalent functionalization polystyrene microsphere; graphene oxide; composite; covalent functionalization
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Stroe, M.; Cristea, M.; Matei, E.; Galatanu, A.; Cotet, L.C.; Pop, L.C.; Baia, M.; Danciu, V.; Anghel, I.; Baia, L.; Baibarac, M.A. Optical Properties of Composites Based on Graphene Oxide and Polystyrene. Molecules 2020, 25, 2419.

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