Rheology measurements were carried out using an Anton Paar MCR 302 Rheometer with a cone-plate geometry (50 mm diameter, and 2° angle). The OTPh/NaDC and P3HT/NaDC hydrogels were prepared by transferring the hot solution to a 35 mm × 10 mm polystyrene Petri dish and the sample was kept at rest for 20 h in the dark. The gels were gently lifted with a spatula and then moved to the rheometer's geometry base (see video in the Supporting Information).