resumo
Flexible and electrically conductive materials are gaining significant attention across various domains, notably in electronics, biomedicine and food industry. One promising strategy involves the integration of electrically conductive nanostructures into a polymeric matrix to fabricate composite materials. However, achieving uniform through-plane electrical conductivity remains a challenge due to the preferential alignment of carbon nano- structures in the in-plane direction. Herein, we report the development of electrically conductive chitosan (CS)- based biocomposite films incorporating a multicomponent filler system. By combining carbon supported on sepiolite clay (CARSEP) with multiwalled carbon nanotubes (MWCNT), it is aimed to facilitate an interconnected distribution in both in-plane and through-plane directions. The optimized film, featuring a CS/CARSEP/MWCNT mass ratio of 50/40/10, exhibited a maximum electrical conductivity of 55.5 S/m and 0.1 S/m in the in-plane and through-plane directions, respectively. Additionally, migration studies demonstrated the absence of harmful compounds upon heating the film up to 60 degrees C in air, ethanol, or hexane. These findings highlight the potential of these flexible and electrically conductive biocomposite films, primarily composed of biobased materials, for applications requiring through-plane electrical conductivity.
palavras-chave
REDUCED GRAPHENE OXIDE; SUPPORTED GRAPHENE; BIONANOCOMPOSITES; NANOFIBERS; GREEN
categoria
Chemistry; Materials Science
autores
Barra, A; Ferreira, NM; Poças, F; Ruiz-Hitzky, E; Nunes, C; Ferreira, P
nossos autores
Ana Barra
Bolseiro de pós-Doutoramento
Cláudia Nunes
Investigador Auxiliar
Nuno Miguel Freitas Ferreira
Bolseiro de pós-Doutoramento
Paula Celeste da Silva Ferreira
Investigador CoordenadorGrupos
G2 - Materiais Fotónicos, Eletrónicos e Magnéticos
G4 - Materiais Renováveis e Economia Circular
Projectos
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
agradecimentos
This work was developed within the scope of the project CICECO Aveiro Institute of Materials, UIDB/50011/2020, UIDP/50011/2020 & LA/P/0006/2020, i3N LA/P/0037/2020, UIDB/50025/2020 and UIDP/50025/2020), and CBQF (UIDB/50016/2020) financed by national funds through the FCT/MCTES (PIDDAC). AB is thankful to FCT for grant SFRH/BD/148856/2019. CN is grateful to Portuguese national funds (OE), through FCT, I.P., in the scope of the framework contract foreseen in the numbers 4, 5 and 6 of the article 23, of the Decree-Law 57/2016, of August 29, changed by Law 57/2017, of July 19 (DL 57/ 2016/CP1482/CT0031). ERH: acknowledge financial support from the MCIN/AEI/10.13039/501100011033 (Spain, project PID2019-105479RB-I00).