On the diazonium surface treatment of graphene oxide: effect on thermoelectric behavior of polythiophene hybrid ternary composites

• Published in: Polymer bulletin (Berlin, Germany) Vol. 80; no. 5; pp. 5785 - 5808
• Main Authors: Metref, Lynda, Mekki, Ahmed, Bekkar Djeloul Sayah, Zakaria, Nedjar, Lynda, Delaleux, Fabien, Durastanti, Jean-Felix, Riou, Olivier
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.05.2023; Springer Nature B.V
• Subjects: Aromatic compounds; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Complex Fluids and Microfluidics; Conductivity; Electrical resistivity; Energy conversion; Figure of merit; Fourier transforms; Graphene; Heat conductivity; Hybrid composites; Organic Chemistry; Original Paper; Physical Chemistry; Polymer Sciences; Polymers; Polythiophene; Raman spectroscopy; Room temperature; Seebeck effect; Soft and Granular Matter; Structural analysis; Surface treatment; Thermal energy; Thermoelectric materials; Functionalized graphene oxide; Polythiophene ternary composites; Aryl diazonium salts; Thermoelectric properties
• ISSN: 0170-0839; 1436-2449
• DOI: 10.1007/s00289-022-04333-9

Nowadays, thermoelectric materials are the subject of huge number of research dealing with energy conversion optimization. Herein, we report the study of thermoelectric performance improvement of three different ternary hybrid composite-based polythiophene, poly(3,4-ethylene-dioxythiophene)/poly(4-styrenesulfonate) and both of graphene oxide, reduced graphene oxide and aryl diazonium salt functionalized graphene oxide (FGO). Structural and morphological characterization of the as-prepared materials was carried out by using FTIR, Raman spectroscopy and SEM. Thermoelectric characteristics were determined through the measurement of figure of merit ZT and the electrical conductivity as well as the Seebeck coefficient at room temperature of 298.15 K. Hybrid composite based on functionalized graphene oxide (PTh-FGO-PEDOT:PSS) has shown the most significant improvement over polythiophene alone, marking an enhancement of 71 times in terms of electrical conductivity and 3 times in terms of Seebeck coefficient, resulting in very large ZT coefficient value within magnitude of 2.3 × 10 5 , which highlights the great apport of using aryl diazonium salts in surface modification of graphene oxide.