Bionic spider web multi-resolution graphene tactile sensor and ultrasonic sensor

- Jun 11, 2019-


  
In recent years, there has been an increasing demand for flexible electronics such as integrated circuits, wearable devices, and implanted electronics, which has greatly promoted the development of flexible electronics. Multi-analytical detection in complex environments requires multi-dimensional precision response and smooth signal transmission to ensure recognition resolution and detection sensitivity. However, how to solve the problem of interface fusion of multi-material integration and the single function of single material is still a challenging topic in the field of multi-resolution sensors. Recently, researchers of the Institute of Chemistry of the Chinese Academy of Sciences, Professor Yan Yanlin, Associate Researcher Li Fengqi and Associate Professor Ma Ying of Shenyang Jianzhu University, inspired by the spiral and radiation microstructures and unique assembly methods in spider webs, developed a new type of research. Multi-resolution graphene touch sensor.


In nature, spiders convert spider silk proteins into spider silks of different properties through glands. Spider webs are mainly composed of radiation and spirals. The radiation is an ordered layered structure that extends radially outwards to provide structural support and transmit vibration signals. The spiral is a fluffy structure that stretches from the center to capture the prey. The tight connection between the two quickly transfers the prey information to the spider to maximize the transmission of information. Inspired by the unique assembly method of spider webs, the authors propose to construct electronic devices through different structures of the same material. Graphene has been attracting attention because of its high electron mobility, high thermal conductivity, and excellent mechanical properties. In addition, graphene has multidimensional assembly forms such as graphene fibers, graphene ribbons, graphene films, graphene papers, and graphene aerogels to meet different needs. Therefore, the different structures of graphene are the best choice for constructing different microstructure "wires".


Bionic spider web multi-resolution graphene tactile sensor

Figure 1. Bionic spider web multi-resolution graphene tactile sensor.


The Song Yanlin team used highly sensitive graphene aerogel as the induction material, and used the highly conductive and high-stability graphene ribbon as the transmission material. Statistical principal component analysis (PCA) and hierarchical cluster analysis (HCA) were selected. And linear discriminant analysis (LDA) to evaluate the spatial resolution of graphene multi-structure sensors. The results show that the design of integrating different structures can realize the identification of direction, distance and position. In order to further prove the application potential of multi-structure graphene in flexible electrons, they designed an electronic skin with a tightly packed structure of graphene and porous structure graphene. The mechanical finger can be individually controlled by the corresponding graphene aerogel, and the bending and stretching of the mechanical finger can be manipulated by gently swiping the finger on the graphene aerogel, and the measured minimum force can reach 3.83×10-3 Pa.


Site recognition analysis of multiresolution graphene tactile sensor

Figure 2. (a) Site recognition analysis of multiresolution graphene tactile sensors; (b) Multi-structure integrated graphene electronic skin manipulation manipulator.


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