Chinese Academy of Sciences successfully developed a new type of flexible high-performance strain sensor

[China Instrument Network Instrument Development] As early as the 1970s, the concept of electronic skin has appeared in many science fiction works. At the same time, scientists have also begun to explore the electronic skin, because it has great application prospects in the field of intelligent robots, bionic prosthetics, and health monitoring.

(a) Optical photographs of metal alloy skin. (b) XRD and TEM show its disordered atomic structure. (c) "Transparent" amorphous alloy skin. (d) Amorphous alloy skin light transmittance as a function of thickness.
The basic unit of electronic skin is a flexible strain sensor. However, the existing strain sensitive materials have the disadvantages of poor conductivity, high energy consumption, complicated manufacturing process, and high cost, which greatly limit the practical application of electronic skin. Therefore, the search for new strain sensing materials is imminent.
Metal alloys are one of the earliest and still widely used materials in daily life. However, the range of the elastic limit of the crystalline metal alloy is very small, and the elastic limit of the general metal alloy material is much less than <0.5%, which is the largest short plate of the metal material applied in the electronic skin field. Rapid rapid cooling is a modern method for preparing new alloy materials. This method can retain the disordered atomic structure of metal liquids. The resulting amorphous alloy material can greatly increase its elastic limit range, up to >2%, which is a general alloy. Dozens of times the material. Amorphous alloys also retain their excellent electrical conductivity. Taking advantage of these characteristics of amorphous alloy materials, Institute of Physics, Chinese Academy of Sciences/Beijing National Laboratory for Condensed Matter State Extreme Conditions Laboratory EX04 group doctoral candidate Haiying Hai under the guidance of Prof. Weihua Wang, Researcher Bai Yangyang, and Researcher Liu Yanhui, recently A new type of flexible high-performance strain sensor, amorphous alloy skin, was developed.
The amorphous alloy skin is obtained by directly growing an amorphous alloy film such as ZrCuNiAl on a flexible plastic (PC) substrate by ion beam sputtering. Amorphous alloy sensors have good flexibility (bending angle >180?) and can be visually "transparent" by regulating the film thickness. The piezoresistive effect test results of the sensor showed that the amorphous alloy skin retains the high conductivity of the metal material (>5000 S cm-1), and has a perfect linear relationship between resistance and strain, and good stability. At the same time, the elastic range is greatly improved compared to conventional crystalline metal materials (the theoretical elastic limit at room temperature is 4.2%). In addition, the sensor has a very small temperature coefficient of resistance (9.04×10-6 K-1), and is obviously antibacterial. In addition, the preparation method of the amorphous flexible strain sensor is simple and the manufacturing cost is low. Utilizing these unique properties of amorphous alloy flexible strain sensors, it is expected to promote the practical application of electronic skin as soon as possible, and at the same time open up new avenues for the application of amorphous alloy materials.
The related work "Flexible strain sensors with high performance based on metallic glass thin film" was recently published in Applied Physics Letters (111, 121906, 2017).
The research work was supported by the National Natural Science Foundation of China (51571209 and 51461165101), the 973 Project (2015CB856800), and the key projects of the Frontier Bureau of the Chinese Academy of Sciences.
(Title: Amorphous Alloy Skin: A New Type of High Performance Flexible Strain Sensor)

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