A flexible sensor is a flexible electronic component that can be worn on medical products. As an important sensor, it can detect basic human body data. However, many people are unaware of the characteristics of flexible sensors, and some wonder why they are no longer popular. In fact, flexible sensors currently face certain development challenges. Today, we will introduce in detail: "What are the characteristics and development challenges of flexible sensors?"
I. Characteristics of flexible sensors
Flexible materials are a concept corresponding to rigid materials. Generally, flexible materials have properties such as softness, low modulus, and easy deformation. Common flexible materials include: polyvinyl alcohol (PVA), polyester (PET), polyimide (PI), polyethylene naphthalate (PEN), paper, textile materials, etc.
Flexible sensors refer to sensors made of flexible materials. They have good flexibility and extensibility, and can even be freely bent or folded. Moreover, their structural forms are flexible and diverse, allowing them to be arranged arbitrarily according to measurement requirements, making it very convenient to detect complex measured objects. New flexible sensors are widely used in fields such as electronic skin, healthcare, electronics, electrical engineering, sports equipment, textiles, aerospace, and environmental monitoring.
II. Challenges in the Development of Flexible Sensors
First of all, regarding materials, there are currently many materials used to fabricate flexible sensors, mainly metal materials, inorganic semiconductor materials, organic materials, and flexible substrates. Taking metal materials as an example, it is not difficult to use conductors such as gold, silver, and copper to make electrodes and wires; there are many inorganic semiconductor materials, and it is reported that scientists once used ZnO and ZnS to make a flexible sensor by utilizing the photoelectric effect, but the challenge here is the limited flexibility of the material; organic materials have better flexibility, but their sensitivity to piezoresistive and capacitive signals is inferior to that of metal materials, which limits their development in high-precision measurement fields; the materials for flexible substrates are very limited, with polydimethylsiloxane (PDMS) being relatively successful, and there are still many materials to be explored in the future. Not long ago, research institutions discovered that carbon materials can also be used to manufacture flexible sensors, but this requires graphene materials, which is also a material that has long failed to achieve mass production.
Secondly, regarding the fabrication process, achieving high-performance flexible sensors requires specialized manufacturing techniques. In particular, active materials and flexible substrates are essential, as flexible sensors have extremely strict requirements for dimensions and thickness; otherwise, performance standards cannot be met. Another major challenge is the high conductivity requirement during fabrication, which significantly impacts the final yield.
Lastly, industry chain synergy limits the application and potential of flexible sensors. After all, a complete product requires numerous components. While the sensor itself can achieve flexibility, ensuring the performance of other related components remains a difficult problem that the entire industry must address.
The above is a detailed introduction to "What are the characteristics and development challenges of flexible sensors?". If you have any other questions, please feel free to contact us.
