Fractal-structured silver particles (FSSPs) are conductive materials with a micron-scale trunk and nanoscale branches, and are characterized with high electrical conductivity and high connectivity. In this study, FSSPs were added to an aqueous additive solution for synthesizing a conductive ink, which was used to prepare two types of printing electrodes via screen printing. The first type included two flexible printed electrodes (FPEs): an FPE on a polyethylene terephthalate (PET) film and an FPE on paper. The second one was a polydimethylsiloxane (PDMS)-embedded FPE. The PET-based FPE exhibited high electrochemical stability when its sheet resistance was 0.38 Ω/sq for a 50% (w/w) content of FSSPs in the prepared conductive ink. Moreover, the embedded FPE demonstrated excellent mechanical properties and high chemical stability. In addition, the embedded structure was endowed with stretchability, which is important for different devices, such as flexible biomedical sensors and flexible electronics.

Three-dimensional porous paper was prepared by using polysulfonamide (PSA) fiber and pulp as the raw materials. The effect of PSA fiber to pulp ratios on the mechanical strength and adsorption properties (using methyl orange and rhodamine B dyes in their aqueous phase) of the paper were studied. The results showed that the tensile strength and elongation characteristics decreased as the PSA fiber to pulp ratio increased, while the tear strength increased. PSA paper showed good adsorption performance for both methyl orange and rhodamine B, with the adsorption process conforming to the pseudo-second-order and Langmuir isotherm models, indicating monolayer chemical adsorption. The study has provided an improved theoretical and scientific basis for the further development and application of PSA paper.