Graphene and the Applications in Graphene-Based Flexible Sensors

The combination of biomedicine and intelligent technology has promoted the development of flexible sensors. This type of sensor requires highly flexible materials for modification, achieving the goal of improving wearability and performance. Carbon material is the most commonly used functional material in the world. Graphene, as a material composed of carbon elements, has excellent flexibility and conductivity. The discovery of graphene augmented the family of carbon materials. Graphene, as a two-dimensional material, completed a dimensional hierarchy of carbon material family. As graphene is high flexible with outstanding in-plane conductivity, graphene can be applied in the flexible sensors. Skin is the largest organ in the human body. It is stretchable and flexible. Meanwhile, the skin can perceive external signals. Wearable smart sensors, which exhibit high flexibility, can mimic the tactile sensing capabilities of human skin to detect various stimuli, such as pressure, strain, temperature, and humidity. This work focuses on graphene and graphene based flexible sensors. Its working mechanism and application are discussed. This work will contribute to the development of flexible wearable sensors.