Optical Properties of Composites Based on Graphene Oxide and Polystyrene
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
Affiliations
Malvina Stroe
Laboratory Optical Processes in Nanostructure Materials, National Institute of Materials Physics, Atomistilor str. 405 A, 77125 Bucharest, Romania
Mirela Cristea
Laboratory Optical Processes in Nanostructure Materials, National Institute of Materials Physics, Atomistilor str. 405 A, 77125 Bucharest, Romania
Elena Matei
Laboratory Optical Processes in Nanostructure Materials, National Institute of Materials Physics, Atomistilor str. 405 A, 77125 Bucharest, Romania
Andrei Galatanu
Laboratory Optical Processes in Nanostructure Materials, National Institute of Materials Physics, Atomistilor str. 405 A, 77125 Bucharest, Romania
Liviu C. Cotet
Department of Chemical Engineering, Faculty of Chemistry and Chemical Engineering, Babes-Bolyai University, Arany Janos str. 11, 400028 Cluj-Napoca, Romania
Lucian C. Pop
Department of Chemical Engineering, Faculty of Chemistry and Chemical Engineering, Babes-Bolyai University, Arany Janos str. 11, 400028 Cluj-Napoca, Romania
Monica Baia
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
Virginia Danciu
Department of Chemical Engineering, Faculty of Chemistry and Chemical Engineering, Babes-Bolyai University, Arany Janos str. 11, 400028 Cluj-Napoca, Romania
Ion Anghel
Fire Officers Faculty, “Alexandru Ioan Cuza” Police Academy, Morarilor str. 3, 022451 Bucharest, Romania
Lucian Baia
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
Mihaela A. Baibarac
Laboratory Optical Processes in Nanostructure Materials, National Institute of Materials Physics, Atomistilor str. 405 A, 77125 Bucharest, Romania
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.
