EFFECT OF ELECTRON MEDIATOR ON NATURAL RUBBER LAYER-BY-LAYER FILMS SENSING PERFORMANCE

Azeneth Borja Brochero; Fellipe Cesar Rodrigues Matheus; José Antonio Malmonge; Marystela Ferreira; Cibely da Silva Martin

Todos os Trabalhos

Trabalho

Título do Trabalho

EFFECT OF ELECTRON MEDIATOR ON NATURAL RUBBER LAYER-BY-LAYER FILMS SENSING PERFORMANCE

Autores

Azeneth Borja Brochero
Fellipe Cesar Rodrigues Matheus
José Antonio Malmonge
Marystela Ferreira
Cibely da Silva Martin

Modalidade

Pôster - resumo

Área temática

Sensores e biossensores

Data de Publicação

27/05/2026

País da Publicação

Brasil

Idioma da Publicação

pt-BR

Página do Trabalho

https://www.even3.com.br/anais/workshop-do-ineo-2026/1462443-effect-of-electron-mediator-on-natural-rubber-layer-by-layer-films-sensing-performance

ISBN

978-65-272-2467-9

Palavras-Chave

Natural Rubber, eletron mediator, Layer-by-Layer, sensing platform

Resumo

The incorporation of electronic mediators into a polymeric matrix is a crucial strategy for tuning and controlling electrical and optical properties when the material is structured as thin films, thereby enabling promising sensing applications. Natural rubber (NR), composed of long chains of isoprene units linked in a cis-1,4 configuration, is a biopolymer extracted from renewable sources, which makes it particularly attractive for sustainable material applications [1]. The present work aims to optimize the Layer-by-Layer (LbL) deposition process of self-assembled natural rubber films derived from natural rubber latex (NRL), incorporating nickel tetrasulfonated phthalocyanine (NiTsPc) or carbon dots (CDts) as electronic mediators. The films were assembled onto ITO electrodes using a diluted NRL suspension containing 0.5 mg L?¹ of the electronic mediator as the anionic solution and a 0.5 mg L?¹ polyethyleneimine (PEI) solution as the cationic counterpart. Film growth was carried out up to 15 bilayers, and electrochemical measurements were performed for films containing 5, 10, and 15 bilayers. The LbL films were characterized by UV–Vis spectroscopy, atomic force microscopy (AFM), scanning electron microscopy (SEM), and cyclic voltammetry. Morphological analysis revealed a uniform arrangement of spherical particles, attributed to the preservation of NR particles during film formation in the presence of both electronic mediators. In contrast, NR-only films exhibited coalescence of the spherical particles. Cyclic voltammetry results demonstrated that the incorporation of NiTsPc provided higher interfacial conductivity compared to CDts, suggesting greater sensitivity to charge transfer mediated by the phthalocyanine macrocycle. In summary, the molecularly organized NR films incorporating NiTsPc or CDts exhibited promising electrical properties and favorable morphology for application as sensing platforms. Furthermore, the chemical composition of the electronic mediator plays a key role in modulating sensitivity and electrochemical response in sensing applications. [1] C. R. Cena et. al, Journal of Polymer Research. 2017, 24, pp. 1-7. Acknowledgement: INEO (FAPESP - processo nº 2025/27044-5 e CNPq - processo: 408449/2024-1). FAPESP 2023/14967-2, 2023/17369-9, CAPES e CNPq.

Título do Evento: Workshop do INEO 2026
Cidade do Evento: Nazaré Paulista
Título dos Anais do Evento: Anais do Workshop do INEO 2026
Nome da Editora: Even3
Meio de Divulgação: Meio Digital

Como citar

BROCHERO, Azeneth Borja et al.. EFFECT OF ELECTRON MEDIATOR ON NATURAL RUBBER LAYER-BY-LAYER FILMS SENSING PERFORMANCE.. In: Anais do Workshop do INEO 2026. Anais...Nazaré Paulista(SP) Hotel Estância Atibainha, 2026. Disponível em: https//www.even3.com.br/anais/workshop-do-ineo-2026/1462443-EFFECT-OF-ELECTRON-MEDIATOR-ON-NATURAL-RUBBER-LAYER-BY-LAYER-FILMS-SENSING-PERFORMANCE. Acesso em: 10/08/2026