Recently, researchers from King Abdullah University in Saudi Arabia developed a low-cost sensor called "Paper Skin." It is reported that the sensor can be used to detect movement, and is expected to simultaneously monitor a variety of vital signs in real time, including heart rate, blood pressure, breathing patterns and movements.

At present, wearable and soft electronic products are showing good prospects in a variety of different applications, but this technology often uses expensive and complex materials and processes, to restrict its large-scale applications. This time, researchers in Saudi Arabia developed low-cost sensors that detect environmental elements using everyday materials such as aluminum foil, note paper, sponge and magnetic tape in an attempt to provide a commercially viable and high-performance sensing component for research and development.

The specific principle of the sensor, the research team to use the note paper to detect humidity, sponges and rags to detect the pressure, aluminum foil is used to detect movement. With HB pencil colored note paper, you can let the paper used to detect acidity. Aluminum foil and conductive silver ink are used to detect temperature differences. At the same time, the researchers put all the material together and built it into a simple paper platform before connecting it to a device that detects changes in conductivity based on external stimulus. Researchers make full use of the material properties, including their porosity, adsorption, elasticity and size, to develop low-cost sensing platforms.

Through this single, integrated platform, researchers demonstrate their ability to detect many different external stimuli simultaneously and in real time. In actual use, for example, when humidity increases, the paper platform's ability to store charge or capacitance is increased; exposing the sensor to an acidic solution increases its resistance and decreases when exposed to an alkaline solution; The temperature changes, the platform also detects the voltage changes; the fingers close to the platform, but also disrupt its electromagnetic field, leaving its capacitance decreases.

According to the researchers, several challenges must be overcome before a fully autonomous, multi-functional, flexible sensor platform can be commercialized. For example, to further develop wireless interactions with such paper skins; reliability testing is required to assess the sensor's sustainability or performance under intense flexing conditions. The researchers said the next phase will focus on applications such as medical monitoring systems to optimize the "paper-skin" sensor interaction on such platforms and is expected to simultaneously monitor multiple vital signs in real time, including heart rate, blood pressure, breathing patterns and movements Wait.

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