A review of the research progress of graphene pressure sensors in wearable electronic devices 2

The internal structure of graphene presents a honeycomb like lattice arrangement, connected by carbon atoms, which endows graphene with excellent properties and shines in fields such as electrochemistry and physics. Pressure sensors can be mainly divided into resistive, capacitive, and piezoelectric types based on their sensing mechanisms. Traditional metal and diode semiconductor pressure sensors are limited in their application range and development due to rigidity, brittleness, low sensitivity, narrow sensing range, low resolution, and weak tensile ability. Therefore, flexible material graphene can be used to improve the sensitivity and other performance of pressure sensors, expanding the application range of pressure sensors.

There are two main methods for manufacturing graphene: top-down and bottom-up. The "top-down" method is scalable and cost-effective, including methods such as micro mechanical exfoliation, solution exfoliation, and decompression of carbon nanotubes. The "bottom-up" method is to prepare graphene through atomic assembly, including chemical vapor deposition (CVD), epitaxial growth, and reduction methods.diode

Design and Preparation of Graphene Pressure Sensor

Graphene pressure sensors are mainly based on the piezoresistive effect of graphene, which means that under external force, the resistance value of graphene will change. By measuring the change in resistance value, the change in pressure can be sensed. According to the different structures and piezoresistive mechanisms of graphene, graphene pressure sensors can be divided into piezoresistive sensors based on microstructure deformation and capacitive sensors based on capacitance changesdiode