THERMODEGRADATION STUDY OF A NANOCOMPOSITE CONTAINING SILVER AND CONJUGATED POLYMER NANOPARTICLES IMMOBILIZED IN CHITOSAN FILMS

G. A. Parolin (DR); Unifesp; Diogo Silva Pellosi; Laura Péres

Paper Title

Authors

G. A. Parolin (DR); Unifesp
Diogo Silva Pellosi
Laura Péres

Modality

Pôster

Subject area

Síntese e caracterização de materiais

Publishing Date

12/12/2023

Country of Publishing

Brasil

Language of Publishing

Inglês

Paper Page

https://www.even3.com.br/anais/workshop-do-ineo-2023/612823-thermodegradation-study-of-a-nanocomposite-containing-silver-and-conjugated-polymer-nanoparticles-immobilized-in-

ISBN

978-65-272-0088-8

Keywords

Nanopolymer, conjugated material, nanocomposite, silver nanoparticles, chitosan film

Summary

Nanocomposites are interesting materials due to the desirable combination of unique properties from their components in a specific material, such as luminescence and thermal resistance, for example [1]. Thus, polymeric and metallic nanoparticles emerge as materials of great interest. In this study, it was prepared polythiophene conjugated polymer nanoparticles (CPN) and incorporated into aqueous dispersion of spherical silver nanoparticles (AgNP). Subsequently, the nanocomposite was immobilized in chitosan films, as well as the isolated nanoparticles, and evaluated, through UV-Vis and fluorescence (FL), for its thermal stability before and after exposure to higher temperatures (80 and 160 °C) for three hours. It was possible to observe that all absorption and emission curves before and after exposure to 80 °C remained practically constant, which does not happen at higher temperature. It was noticed that in the absorption spectrum for pure chitosan exposed to 160 °C, a new band appears around 280 nm, which increase significantly its absorption intensity. Likewise, in emission spectrum, the intensity was increased, and the maximum wavelength shifted 40 nm to values higher than expected. For AgNP, absorption and emission spectra, the same pattern was observed. In the absorption spectra of chitosan films with NPC and the nanocomposite, the polymer band appear as a shoulder and the new band around 280 nm, prevenient from thermodegradated chitosan, was present either. However, in the emission spectra for films containing NPC, the shift was not observed, only a decrease in the emission intensity of the material, which indicates that the subproduct of chitosan thermodegradation somehow inhibits the emission of the polymeric material. Thus, the films proved to be stable before and after exposed to 80 °C and, despite slightly decreasing the emission intensity of the samples after exposure to higher temperatures, the nanopolymer gives the film greater stability in relation to possible wavelength shifts. Acknowledgment: We are thankful to INEO, Capes (Finance Code 001), and FAPESP (2014/50869-6). Reference: [1] M. Z. Strzalka, A. D. Marczewska; Small AgNP in the biopolymer nanocomposite system. International Journal of Molecular Sciences, 21 (24), 9388, 1–28 (2020).

Title of the Event: Workshop do INEO 2023
City of the Event: Nazaré Paulista
Title of the Proceedings of the event: Anais do Workshop INEO 2023
Name of the Publisher: Even3
Means of Dissemination: Meio Digital
DOI: Get DOI

How to cite

UNIFESP, G. A. Parolin (DR);; PELLOSI, Diogo Silva; PÉRES, Laura. THERMODEGRADATION STUDY OF A NANOCOMPOSITE CONTAINING SILVER AND CONJUGATED POLYMER NANOPARTICLES IMMOBILIZED IN CHITOSAN FILMS.. In: Anais do workshop INEO 2023. Anais...Nazaré Paulista(SP) Hotel Estância Atibainha, 2023. Available in: https//www.even3.com.br/anais/workshop-do-ineo-2023/612823-THERMODEGRADATION-STUDY-OF-A-NANOCOMPOSITE-CONTAINING-SILVER-AND-CONJUGATED-POLYMER-NANOPARTICLES-IMMOBILIZED-IN-. Access in: 27/07/2024