“…With the development of μPADs, multiple conventional detection techniques, such as colorimetric detection [59,61,62,63,64], electrochemical detection [65,66,67,68], chemiluminescence (CL) [69,70,71,72,73], fluorescence [74,75,76,77], mass spectrum (MS) [78,79] and surface-enhanced Raman spectroscopy (SERS) [80,81] have been applied to paper-based devices for rapid diagnostics.…”