Resistance variation of conductive ink applied by the screen printing technique on different substrates

Souto, Antonio P G V/0000-0001-6439-4780; Gomes, Pedro/0000-0002-1096-9590; Carvalho, Helder/0000-0003-0472-1107WOS: 000506650700001This research study focuses on the application of conductive ink by the screen printing technique to evaluate the potential of creating printed electrodes and to investigate the effect of washing upon electrical resistance and flexibility. Two conductive inks were applied by a conventional screen printing method on four different textile substrates, 100% cotton, 50%/50% cotton/polyester, 100% polyester and 100% polyamide. the inks were also applied on a multifibre fabric. Atmospheric plasma treatment was applied to improve the adhesion to the samples, and the resistance values were compared with those of non-treated samples. the values were measured before and after cleaning and washing tests, which were performed to simulate domestic treatment for garments to predict the behaviour of the inks after normal usage of the fabrics. Comfort properties like stiffness of the fabrics were also evaluated after five and 10 washing cycles. It was observed that PE 825 ink forms a thicker film on the fabric surface, contributing to the loss of flexibility of the textile. However, PE 825 ink also produced the best results in terms of durability and lower values of resistance. Polyamide fabrics lost their conductive property after five washing cycles due to weak bonding between the ink and the fibres, whereas cotton fibres provided the best results.Fundacao para a Ciencia e a TecnologiaPortuguese Foundation for Science and Technology [2C2T-BPD-08-2017, UID/CTM/00264/2019]; Deus ex Machina [NORTE-01-0145-FEDER-000026]Fundacao para a Ciencia e a Tecnologia, Grant/Award Number: 2C2T-BPD-08-2017 and UID/CTM/00264/2019; Deus ex Machina, Grant/Award Number: NORTE-01-0145-FEDER-00002