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BIT Has Made Significant Progress in the Field of Multimodal Artificial Electronic Skin Based on Two-Dimensional Materials

Recently, Zhao Jing, Special Researcher of Intelligent Robot Research Institute, BIT, Zhang Guangyu, Researcher of Institute of Physics, Chinese Academy of Sciences, as well as the team of Wang Zhonglin, Academician of Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, have designed a multimodal artificial electronic skin based on two-dimensional materials, which could realize the non-interference and high sensitivity real-time monitoring of external strain and humidity signals, and successfully applied to the monitoring system of human respiratory signal. In particular, a non-contact mode is proposed to early warn the position signal of approaching objects, which effectively avoids the risk of cross infection when multiple people use the devices in contact mode. The results provide a new idea for the future application of sensor devices based on two-dimensional materials in artificial limbs, flexible intelligent wear and other fields. This work was published online on July 10 in Advanced Functional Materials, a top international journal.

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Fig.1. Structure diagram of multimodal artificial electronic skin

In recent years, the rapid development of artificial electronic skin has achieved certain results, but in order to simulate, restore or even replace the body skin, in addition to sensitive sensing of external stress changes, the demand for multifunctional integrated device array with signal response of humidity, pressure and so on has been paid more and more attention. The traditional artificial electronic skin working mode is mostly based on contact sensor. That is, after the external stimulus and sensor parts contact each other, the mechanical stimulation can be judged by the change of electrical signal. This working mode will inevitably lead to the risk of cross infection when many people operate the same device, especially in the case of pandemic devices, the contactless operation mode can minimize the risk. Taking into account the size advantages of two-dimensional materials and the characteristics of flexible and easy attachment and different substrates, based on the graphene and molybdenum disulfide film grown on the wafer size, a multimodal response artificial electronic skin has been developed. Electronic skin not only has skin-like multi-function sensing functions, but its high sensitivity, fast response time, and multiple working modes far exceed human skin. Graphene and molybdenum disulfide devices can only respond to strain and humidity signals respectively, and the integrated sensor array can realize the recognition of external stimuli in contact and non-contact modes at the same time, especially the signal reading in non-contact mode by using the change of humidity signal. It improves the disadvantage that the traditional electronic skin only reads the signal through the contact mode, which is easy to cause cross infection. Through the circuit design of the device array, the problem of mutual interference among multiple devices on flexible substrate is effectively solved, and the multiplexing is realized. The artificial electronic skin based on this processing is placed in the mask, which can monitor the respiratory signal (including respiratory rate, intensity, and humidity, etc.) in real time, and alarm the health status of the monitored by setting the alarm line. This kind of multimodal artificial electronic skin can be widely used in the fields of intelligent prosthetics, health monitoring, etc., and provides a new working mode for human-computer interaction. In the future, combined with wireless signal transmission systems, real-time monitoring of patient health signals can be realized, providing new opportunities for the development of telemedicine.

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Fig. 2. The monitoring of respiratory signal by artificial electronic skin and the real-time monitoring of human hand movement position by non-contact positioning system

Zhao Jing is the first author of the paper, with Wang Zhonglin as the co- corresponding authors and BIT as the first unit. This work is supported by the “Intelligent Robot” project, the key research and development program of the Ministry of Science and Technology, the National Natural Science Foundation of China, and the Academic Startup Plan for young teachers of BIT.


The information of the paper:

Jing Zhao*, Zheng Wei, Zhongyi Li, Jinran Yu, Jian Tang, Guangyu Zhang, Zhonglin Wang*, Skin-inspired High-Performance Active-matrix Circuitry for Multimodal User-interaction, Advanced Functional Materials

Paper Link: https://doi.org/10.1002/adfm.202105480