| abstract |
Provided herein is a hydrogel for pH sensing, comprising poly(3,4- ethylenedioxythiophene) doped with poly(styrenesulfonate) ("PEDOT:PSS") dispersed in a polymer matrix (PM), wherein the PEDOT:PSS and PM are present in a ratio such that the hydrogel is stable in aqueous solution. There is also provided hydrogel compositions comprising PEDGT:PSS; a polymer matrix (PM); and a solvent, wherein the PEDOT:PSS and PM are present in the composition in a ratio such that the composition dries to form a hydrogel that is stable in aqueous solution. Methods of making these hydrogels and hydrogel compositions, as well as uses of these hydrogels and hydrogel compositions as or in pH sensing devices are also described. |