Optical Properties of Composites Based on Graphene Oxide and Polystyrene

Autor: Malvina Stroe, Mirela Cristea, Elena Matei, Andrei Galatanu, Liviu C. Cotet, Lucian C. Pop, Monica Baia, Virginia Danciu, Ion Anghel, Lucian Baia, Mihaela A. Baibarac
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Molecules, Vol 25, Iss 10, p 2419 (2020)
Druh dokumentu: article
ISSN: 25102419
1420-3049
DOI: 10.3390/molecules25102419
Popis: 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.
Databáze: Directory of Open Access Journals
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