| Texto completo | |
| Autor(es): |
De Queiroz, Alfredo Antonio Alencar Exposito
;
de Andrade, Marcelo Barbosa
;
de Queiroz, Alvaro Antonio Alencar
Número total de Autores: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of Raman Spectroscopy; v. N/A, p. 12-pg., 2025-08-12. |
| Resumo | |
Organic memristors (OMEMRs) based on biopolymeric matrices functionalized with silver nanoparticles (AgNPs) are emerging as promising candidates for next-generation non-volatile memory technologies, owing to their multilevel resistive switching behavior, scalability, and compatibility with solution-processable fabrication methods. In this study, AgNPs were coordinated with chondroitin sulfate (ChS) to produce Ag@ChS-based OMEMRs, which were fabricated via spin-coating and subjected to a comprehensive thermal stability assessment using temperature-resolved Raman spectroscopy over the 25 degrees C-275 degrees C range. The Raman spectra revealed a prominent vibrational mode at 76 cm-1, attributed to AgNP lattice dynamics, along with a distinct Ag-O stretching feature near 240 cm-1, indicative of coordination with carboxylate groups within the ChS matrix. A marked attenuation of sulfate-associated Raman bands was observed at approximately 175 degrees C, signifying a critical degradation threshold associated with desulfation, interfacial breakdown, and irreversible loss of memristive functionality. These findings demonstrate that Raman spectroscopy provides a sensitive, non-destructive platform for probing thermally induced molecular transformations and diagnosing early-stage failure in biopolymer-based memristive systems. The insights gained herein offer valuable guidance for the rational design of thermally robust organic memory devices. (AU) | |
| Processo FAPESP: | 13/03487-8 - Centro de caracterização de novas espécies minerais: espectroscopia Raman, difração por raios X e nêutrons, e microssonda eletrônica |
| Beneficiário: | Marcelo Barbosa de Andrade |
| Modalidade de apoio: | Auxílio à Pesquisa - Jovens Pesquisadores |
| Processo FAPESP: | 24/09091-3 - Aprendizado por transferência: de onde e o que transferir? |
| Beneficiário: | Alfredo Antonio Alencar Exposito de Queiroz |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |