Fig. 4: A paper-based polydiacetylene (PDA) sensor array fabricated by inkjet printing method.
From: Surface functionalization strategies for polydiacetylene-based colorimetric sensors
a Fabrication process of the paper-based PDA sensor arrays by light-induced polymerization under 254 nm UV light. b Detection of ethanol in water using the printed PDA sensor array and smartphone. Adapted with permission from ref. 29, copyright (Elsevier B.V., 2024).
