Two dimensional (2-D) atomic layers have several advantages such as flexibility in choosing substrates, easy fabrication, large package area, minimum change of components, enhanced expiration date, and reduced defects by oxygen blocking structure for smart sensor. The sensors with excellent flexibility and stretchability are crucial components that can provide health monitoring systems with the capability of continuously tracking physiological signals of human body without conspicuous uncomfortableness and invasiveness. The signals acquired by these sensors, such as body motion, heart rate, breath, skin temperature and metabolism parameter, are closely associated with personal health conditions.
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