Release date: 2017-09-07
Two slices of bread + sliced ​​meat or vegetables, this is our common form of sandwich composition. So, have you seen the "sandwich" made by high-tech nano-flexible sensing technology?
Recently, the team of researchers of the Institute of Nanotechnology and Nano-Bionics of the Chinese Academy of Sciences, Chen Wei, made a “sandwich†structural flexible mechanical sensor with nanocomposite as the electrode and ionic polymer as the middle layer.
Let's take a look at how this "sandwich" flexible mechanical sensor works.
This "sandwich" flexible mechanical sensor uses a self-assembled three-dimensional crosslinked composite structure "bread layer" of perforated graphene (H-RGO) and single-walled carbon nanotubes (CNTs). This "bread layer" not only helps to form an effective ion migration channel, but also has a three-dimensional network structure with stable mechanical and electrical properties, thereby ensuring excellent large strain mechanical sensing stability. At the same time, the flexible "intermediate layer" of high ion loading ensures high ionic conductivity and mechanical flexibility of the device.
The sensor senses the external pressure based on the new mechanism of ion piezoelectricity. When the material is deformed, the two “bread layers†are in a state of contraction and stretching. The migration speed of the anions and cations to the stretching surface of the material causes the anisotropic transmission to accumulate. The joint electrode "bread layer" forms a potential difference and produces an induced signal output. Therefore, the sensor can realize new functions and new features such as different deformation direction recognition and passive sensing, and finally realize the complex large deformation stability of the flexible mechanical sensor, no source-driven and azimuth recognition.
In short, this sensor can accurately and stably monitor large-scale multi-directional spatial displacement deformation under passive conditions. It can solve the difficulties of most existing flexible sensors, such as power supply drive, non-directional recognition and complex large deformation instability.
As the core of the smart wearable system, the key breakthroughs of related technologies enable the smart wearable system to further protect and expand the practical applications of health monitoring and human-computer interaction, and to some extent solve the bottleneck in the development of smart wearable portable products. problem. This sensor greatly improves the integration and portability of the smart wearable system.
What is the use of this "sandwich" flexible mechanical sensor? How is it applied to the wearable system? The sensor's integrated sensor array can effectively identify multi-dimensional hand movements such as finger bending, wrist bending up/down bending/inward rotation/outward rotation. Therefore, the team successfully applied it to the dexterous sign language recognition and compilation process. The developed smart gloves can sense the change of sign language movements and accurately respond and recognize different configurations and even subtle changes and similar gestures. And in the continuous 6000 actual measurements, the sensing signal has no obvious attenuation and the performance is stable.
Researchers are still working hard, hoping that in the future, the sign language can be directly translated into text or voice by combining relevant data and instruction libraries, bringing the gospel to the deaf and mute. This achievement has important scientific significance and application value for the development of wearable multi-scale human activity monitoring technology and product development.
Relevant research results have been published in the recent ACS Nano journal (http://dx.doi.org/10.1021/acsnano.7b02767).
The work was funded by the National Natural Science Foundation of China, the Chinese Academy of Sciences' key project for foreign cooperation, and the Jiangsu Science and Technology Plan Project (industry foresight and common key technologies).
Figure 1. (a) Preparation process of ion deformation sensor; (b) device composition; (c) H-RGO/CNTs interface electrode structure
Figure 2. (a) ion sensing mechanism of the sensor; (b) response of the device to different strains; (c) identification of direction; (d) cycle stability
Figure 3. (a) Multi-dimensional resolution of the sensor; (b) Smart glove and sign language monitoring and identification
Source: Suzhou Institute of Nanotechnology and Nano-Bionics, Chinese Academy of Sciences
Source: Voice of the Chinese Academy of Sciences (micro signal zkyzswx)
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