30.3 Organic-transistor-based 2kV ESD-tolerant flexible wet sensor sheet for biomedical applications with wireless power and data transmission using 13.56MHz magnetic resonance

A wet sensor, which detects the presence or absence of liquid, is an important tool for biomedical, nursing-care, and elderly-care applications such as the detection of blood in bandages, sweat in underwear, and urination in diapers. A wet sensor should be a thin, mechanically flexible, large-area, and low-cost device with wireless power and data transmission, because constant monitoring with a rigid and wired wet sensor placed on human skin is annoying. Moreover, the wet sensor should be disposable from a hygiene perspective. In order to meet these requirements, an organic transistor based flexible wet sensor sheet (FWSS) with wireless power and data transmission using 13.56MHz magnetic resonance is developed to detect urination in diapers.