Progress in research on flexible paper-based integrated devices of Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences

Flexible sensors can be worn or implanted in the human body, and can detect surrounding environmental information, and have received extensive attention in the field of medical health. However, the sensor itself as a powered device does not work by itself and requires a power supply for it. Planar miniature supercapacitors (MSCs) are easily integrated into sensors or other electronic devices as new miniature electrochemical energy storage devices. The general method is to connect the sensor to the power supply through an external wire, but it is inconvenient in flexible wearable technology. How to integrate flexible and wireless power supplies and sensors on the same chip is a challenge for current research.

Paper materials are low cost, ready to use, and have a porous and coarse fibrous structure that enhances their adhesion to electronic devices. The capillary action caused by the pores of the cellulose causes the ink material printed by the printing technique to spread on the surface of the paper base, resulting in a poor quality of the formed pattern. Yan Xingbin, a researcher at the Clean Energy Chemistry and Materials Laboratory of the Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, formed a metal Ni-pixed current collector on the surface of the filter paper by screen printing technology, and combined with subsequent electroplating techniques to enhance the conductivity of the current collector and suppress it. The diffusion of metallic Ni on the surface of the paper base forms a patterned current collector with a higher resolution. A MnO2-based symmetrical supercapacitor and an asymmetric supercapacitor based on MnO2 and PPy are formed by electrochemically depositing MnO2 or polypyrrole (PPy) active material on the Ni surface and dropping the gel electrolyte. Tests have shown that the paper-based supercapacitor has good electrochemical properties and strong mechanical deformation resistance (the capacity is almost no degradation after bending 10,000 times), and its energy density and power density are all located in the same type of supercapacitor. Forefront.

Based on metal integrated circuits printed on paper, the researchers integrated MSC and UV or gas sensors onto the same single piece of paper. The integrated device showed good sensing characteristics and self-powering characteristics. It is expected that energy harvesting, energy storage and power devices will be integrated into the same paper-based chip in the future. This paper substrate-based integration strategy opens up new ways of designing for portable and wearable electronics.

The research was published online on Advanced Functional Materials, and the research work was supported and supported by the National Natural Science Foundation and the Institute's “One Three Five-Year” key cultivation project.

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