Congratulations to Dr. Ren Jing for receiving the paper by InfoMat
Source: | Author:nanocarbon | Published time: 1710 days ago | 344 Views | Share:

Strain sensors can convert mechanical deformations into detectable electrical signals, and have shown good application prospects in the fields of intelligent robots, medical monitoring, human-computer interaction interfaces, and bionic prostheses. Among them, real-time monitoring of human motion behavior can effectively assess its health status, which is of great significance in wearable medical diagnosis and personal health monitoring. For human motion monitoring, the ideal strain sensor device needs to have both high stretch rate and good stability, so as to provide the possibility of realizing full-scale human motion detection. In addition, due to the diversity and complexity of human motion, the stability of strain sensors under different application conditions (temperature, frequency, etc.) is equally important. However, the currently reported flexible strain sensors often cannot have the above properties at the same time, which limits their application range.
 Recently, Dr. Ren Jing of the research group developed a flexible stretchable strain sensor based on the graphene "sliding rheostat" structure design. By changing the contact area between adjacent graphene sheets, the resistance changes. The sensor has a high Stretching rate (70%), excellent cycle stability (300,000 times), and maintain a stable response in the frequency range of 0.1-5 Hz and the temperature range of -45 °C-180 °C, realizing full-scale human movement monitor. Through in-situ transmission electron microscope observation, it is found that the overlapping graphene sheets slip under the action of external force, and their contact area changes accordingly, resulting in resistance changes. With the help of the deformation of the three-dimensional network on the macrostructure, the slip of the graphene sheet is controlled within the reversible range, which greatly improves the cycle stability of the strain sensor and the stability in a wide temperature and frequency range. The excellent sensing performance makes the strain sensor not only used for the monitoring of large-scale human body movements (walking, squatting), but also for the monitoring of small-scale movements and weak physiological signals (breathing, pulse). The research results have huge application prospects in the fields of personal health monitoring, smart robots and wearable electronic devices. The structural design of the graphene "sliding rheostat" provides new ideas for new multifunctional sensors.

The work was published on InfoMat (DOI:10.1002/inf2.12030) under the title "A graphene rheostat for highly durable and stretchable strain sensor".

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