A carregar...
Projeto de investigação
Advanced Maturation in Anisotropic Cardiac Tissues for Disease Modeling and Drug Screening
Financiador
Autores
Publicações
One-step production of laser-induced graphene via CO2 laser on agarose-lignin membranes
Publication . Machado, Beatriz S.; Morais, Maria; Pinheiro, Tomás; Deuermeier, Jonas; Teixeira, Vasco; Nunes, Daniela; Martins, Rodrigo; Inácio, José M.; Fortunato, Elvira; Almeida, Henrique V.; DCM - Departamento de Ciência dos Materiais; CENIMAT-i3N - Centro de Investigação de Materiais (Lab. Associado I3N); UNINOVA-Instituto de Desenvolvimento de Novas Tecnologias; NOVA Medical School|Faculdade de Ciências Médicas (NMS|FCM); IOP Publishing
Laser-induced graphene (LIG) is a highly promising material for bioelectronics due to its excellent electrical conductivity, high surface area and biocompatibility. Nevertheless, the functionalization of biocompatible substrates with LIG is essential to propel the use of LIG-derived technologies forward in bioengineering. This study demonstrates the successful fabrication of LIG on agarose-lignin membranes using a single-step CO2 laser process. Membranes with 3 or 5 wt.% agarose, and 0.25 or 0.5 wt.% lignin were characterized for thickness and swelling degree to assess their behavior in a human-mimicking media. The LIG was comprehensively studied, measuring electrical and sheet resistance, and by employing techniques such as Raman spectroscopy, scanning electron microscopy (SEM) coupled with energy-dispersive x-ray spectroscopy (EDS), and x-ray photoelectron spectroscopy (XPS) to evaluate graphitization efficiency and investigate its physicochemical characteristics. Electrical measurements revealed that the lowest sheet resistance achieved was equal to 139 ± 2 Ω sq−1, with lower laser speeds (below 76.2 mm s−1) and higher power settings (above 2.5 W) leading to improved conductivity. SEM analysis revealed a three-dimensional porous structure with pore sizes ranging from nanometers to micrometers, contributing to enhanced electrical conductivity and suitability for bioelectronic applications. EDS mapping further identified carbon, oxygen, and sodium. XPS analysis provided detailed insights into the chemical states of carbon, indicating high-quality graphene formation. The integration of LIG with these flexible, biocompatible membranes highlights their potential for use in bioelectronic devices, including wearable sensors and implantable medical technologies. These findings underscore the potential of agarose-lignin-based LIG as a scalable, eco-friendly platform for future bioelectronic innovations.
Unidades organizacionais
Descrição
Palavras-chave
Contribuidores
Financiadores
Entidade financiadora
Fundação para a Ciência e a Tecnologia
Programa de financiamento
CEEC IND 3ed
Número da atribuição
2020.01194.CEECIND/CP1602/CT0002