ABSTRACT The growing demand for sustainable diagnostic devices has shifted attention toward biodegradable choices in both material and substrate design. Recent advances in wood‐ and lignin‐derived materials have enabled a growing class of sustainable electronic and bioelectronic systems, often referred to as ‘wood‐based bioelectronics’. Within this context, the present work contributes a distinct materials and device strategy by integrating PEDOT:Lignosulfonate as an active mixed ionic–electronic channel material in organic electrochemical transistors (OECTs) fabricated on biodegradable paper substrates. The PEDOT:LigS biocomposite was synthesized via chemical oxidative polymerization using various oxidants. The thin films of the resulting biocomposites exhibited good electrical conductivity of up to 1.1 S cm − 1 , along with biocompatibility confirmed for L929 cells by following ISO 10993 standard protocol conditions. Conventional OECTs fabricated with PEDOT:LigS showed transconductance values of up to 12.9 mS. Replacing glass substrates with photographic paper enabled the fabrication of degradable OECT devices, revealing a material weight loss of 85% after 43 days in soil. These results highlight the potential of bio‐based materials for more sustainable wood‐based bioelectronics.
Matura et al. (Mon,) studied this question.