Polaron formation via doping process in an organic semiconductor polymer based on thiophene-phenylene.
SILVA, Marcia Dutra Ramos; SILVA, Silésia Fátima Curcino da; JARROSSON, Thibaut; PORTE, Jean Pierre Lère; SPIRAU, Françoise Serein; NOBUYASU JUNIOR, Roberto Shigueru; PEREIRA, Gustavo Gonçalves Dalkiranis; ZANATTA, Bruno Souza; NOGUEIRA, Sandra Lucia; FOSCHINI, Mauricio; SILVA, Rogério Almeida; MARLETTA, Alexandre.
SILVA, Marcia Dutra Ramos; SILVA, Silésia Fátima Curcino da; JARROSSON, Thibaut; PORTE, Jean Pierre Lère; SPIRAU, Françoise Serein; NOBUYASU JUNIOR, Roberto Shigueru; PEREIRA, Gustavo Gonçalves Dalkiranis; ZANATTA, Bruno Souza; NOGUEIRA, Sandra Lucia; FOSCHINI, Mauricio; SILVA, Rogério Almeida; MARLETTA, Alexandre.
Abstract: In this research, we synthesized and analyzed the polymer 5-(5-(10-chlorodecyloxy)-2-methoxy-4-(5-methylthiophen-2-yl)phenyl)-5'-(2-(2-ethylhexyloxy)-5-methoxy-4-(5-methylthiophen-2-yl)phenyl)-2,2'-bithiophene (PTBT46). The polymer was dissolved in chloroform and subjected to gamma radiation doses ranging from 0 to 100 Gy (gray). We observed that PTBT46 can be doped with H+ions, as indicated by visible color changes, optical measurements, and a tenfold increase in conductivity. When analyzing PTBT46 in solution using THF (tetrahydrofuran) and chloroform, we found a notable solvent dependence. In chloroform, new absorption bands appeared at approximately 680 nm and 2630 nm after radiation doses of 25 to 100 Gy, which were not present in THF. These bands are attributed to polarons and bipolarons resulting from the doping process. Additionally, we observed a spectral ?blue shift? with increasing H+concentration due to changes in molecular conjugation, without degradation of the polymer chain. This shift, confirmed by Fourier-transform infrared (FTIR) spectroscopy, is reversible and suggests potential applications in optoelectronic devices and advanced radiation sensors.
@article={003215823,author = {SILVA, Marcia Dutra Ramos; SILVA, Silésia Fátima Curcino da; JARROSSON, Thibaut; PORTE, Jean Pierre Lère; SPIRAU, Françoise Serein; NOBUYASU JUNIOR, Roberto Shigueru; PEREIRA, Gustavo Gonçalves Dalkiranis; ZANATTA, Bruno Souza; NOGUEIRA, Sandra Lucia; FOSCHINI, Mauricio; SILVA, Rogério Almeida; MARLETTA, Alexandre.},title={Polaron formation via doping process in an organic semiconductor polymer based on thiophene-phenylene},journal={European Polymer Journal},note={v. 220, p. 113485-1-113485-10 + supplementary data},year={2024}}