Figure 1. Bioelectronic decal and lamination.

(a) Illustration of bioelectronic decal composed of a sheet of nanocellulose containing multiple OECTs; (b) expanded schematic of a single OECT decal, consisting of the nanocellulose substrate, an inkjet-printed SU-8 layer, evaporated gold electrodes and the drop-cast PEDOT:PSS layer. Biofluid, e.g. sweat, will be vertically wicked within the decal, due to the porous and hydrophilic nanocellulose substrate. The biofluid will be transported to the gate electrodes and PEDOT:PSS layer on top. (c–e) Representative photographs OECT decals. (c) Removal of the decal from the backing glass wafer after fabrication. (d) Laminated OECT decals on glass and (e) the original wafer they were peeled from.