Photocurable printed piezocapacitive pressure sensor based on an acrylic resin modified with polyaniline and lignin

• Autor(a) principal: Arias-Ferreiro, Goretti
• Data de Publicação: 2022
• Outros Autores: Ares-Pernas, Ana, Lasagabáster-Latorre, Aurora, Dopico-García, M. Sonia, Ligero, Pablo, Pereira, N., Costa, P., Lanceros-Méndez, S., Abad, María-José
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: https://hdl.handle.net/1822/82028
• topic: Polyaniline; Photocurable printed; Piezocapacitive sensor; Dielectric constant; Flexible electronics; Science & Technology

The design of suitable materials for the manufacture of pressure sensors with high sensitivity and flexibility in wearable electronics is still a challenge. In this study, a flexible and portable pressure sensor has been developed based on a photopolymeric formulation of polyaniline (PANI) /Lignin/acrylate. The amount of photoinitiator and the presence of lignin within the filler were investigated in order to obtain the best printability and capacitive response. Low PANI contents drastically increased the dielectric constant and 4 wt.% photoinitiator improved the signal and sensitivity. A sensitivity of 0.012 kPa-1 was achieved in a linear range (0 to 10 kPa) with only 3.5 wt.% PANI. Lignin improved both the dispersion of the filler within the matrix and the printability of the resin, due to lower absorptivity at the UV wavelength of the 3D printer. Thus, the PANI-Lignin filler was selected for the fabrication of a piezocapacitive prototype transducer. The pressure transducer demonstrated its practical application by responding to a human footfall and transmitting its corresponding electrical signal. This study shows the enhanced properties of lignin modified PANI acrylate composites. Based on lignin, an abundant natural waste, a sustainable photocurable cost-effective polymer is proposed for the fabrication of printable, wearable electronics.