A polypyrrole-polydimethylsiloxane sponge-based compressible capacitance sensor with molecular recognition for point-of-care immunoassay

A highly compressible and all-solid-state polydimethylsiloxane (PDMS) sponge-based flexible capacitance sensor modified with polypyrrole (PPy) was designed as the signal readout for the sensitive immunoassay of prostate-specific antigen (PSA).