The development of multi-functional piezoelectric polymer film is of great

significance to many application fields, such as those involving wearable

functional devices, flexible sensors, and actuators. In this study, multilayer

P(VDF-HFP) nanocomposite films were prepared using electrospinning technology

with the MWCNTs-COOH and Eu complexes as fillers to achieve a fluorescent

labeled multimode pressure sensor. The sandwich-structured

devices were prepared using both electrospun polyurethane (PU) nanofiber

films and P(VDF-HFP) composite nanofiber films, where the P(VDF-HFP) composite

nanofiber film was used as the core electroactive layer and the polyurethane

(PU) nanofiber film was used for the skin layers. The resulting

sandwich-structured devices showed high sensitivity at ultra-low-pressure

(<1 kPa), high piezoelectric output (2.1V), fluorescence functionality,

excellent flexibility, and good thermal properties. Our results suggest that

sandwich-structured devices based on fluorescent labeled electroactive P(VDF-HFP)

composite nanofiber films have great potential for application in the fields of

multi-functional flexible sensors and intelligent wearables.