EFEITOS DA TEMPERATURA NOS ESPECTROS RAMAN DOS POLÍMEROS CONDUTORES PEDOT E MEH‑PPV
| Autor: | Celly M. S. Izumi, Alvaro C. C. Barra, Thaeny C. Amaral |
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| Rok vydání: | 2019 |
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| Zdroj: | Química Nova v.42 n.9 2019 Química Nova Sociedade Brasileira de Química (SBQ) instacron:SBQ Química Nova, Vol 42, Iss 9, Pp 1098-1103 (2019) |
| ISSN: | 1678-7064 0100-4042 |
| DOI: | 10.21577/0100-4042.20170425 |
| Popis: | The present work shows the temperature dependence of the Raman spectra of two conjugated polymers: poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) and poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS). In situ resonance Raman spectra of PEDOT from 77 to 423 K at 633 nm and of MEH-PPV from 77 to 473 K at 785 nm suggest that, for both polymers, as the temperature increases there is a decrease in the chain conjugation length. Raman bands of PEDOT assigned to the νsim Cα-Cβ are the most sensitive to temperature while bands due to oxyethylene rings do not show significant shifts in this temperature range. Raman and FT-IR spectra of MEH-PPV recorded above the thermal decomposition temperature provide some insights about the thermal degradation. |
| Databáze: | OpenAIRE |
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