Conductive Film with Flexible and Stretchable Capability for Sensor Application and Stealth Information Transmission
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ARTICLE
POLYMER SCIENCE
https://doi.org/10.1007/s10118-020-2483-x Chinese J. Polym. Sci.
Conductive Film with Flexible and Stretchable Capability for Sensor Application and Stealth Information Transmission Yi-Fei Shana, Kun Yangb*, Zhi-Xi Lia, Xiao-Xiao Wanga, Hao Lia, and Yong-Yan Cuia* a College of Chemical Engineering and Materials Science, Tianjin University of Science and Technology, Tianjin 300457, China b Institute of Molecular Aggregation Science, Tianjin University, Tianjin 300072, China
Abstract Flexible and wearable strain sensors for human-computer interaction, health monitoring, and soft robotics have drawn widespread attention to promising applications in the next generation of artificial intelligence devices. However, conventional semiconductor sensors are difficult to meet the requirements of flexibility and stretchability. Here, we reported a kind of novel and simple sensor based on layer-by-layer (LBL) method. Carbon nanotubes (CNTs) layer provides high ductility and stability in the process of tension sensing, while silver layer provides low initial resistance and fast reflecting in the process of tension sensing. LBL method ensures the uniformity of the conductive layer. The sensor has superior sheet resistance of 9.44 Ω/sq., high elongation at break of 104%. For sensing capability, the sensor has wide reflecting range of 60%, high gauge factor (GF) of 1000 up to 60% strain, fast reflecting time of 165 ms. Excellent reliability and stability have also been verified. It is also worth mentioning that the entire process does not require any expensive equipments, complicated processes or harsh experimental conditions. The above features provide an idea for large-scale application of flexible stretchable sensors. Keywords Strain sensor; Flexibility; Silver films; Carbon nanotubes; Human motion monitoring Citation: Shan, Y. F.; Yang, K.; Li, Z. X.; Wang, X. X.; Li, H.; Cui, Y. Y. Conductive film with flexible and stretchable capability for sensor application and stealth information transmission. Chinese J. Polym. Sci. https://doi.org/10.1007/s10118-020-2483-x
INTRODUCTION With the development of smart materials,[1] stretchable strain sensors which can convert mechanical deformation into readable resistive or capacitive signals are widely utilized in human activity recognition,[2,3] health monitoring,[4] and wearable display.[5−8] For example, human-computer interaction[9,10] records small skin deformation caused by speech and large deformations for health assessment monitoring, such as bending/straightening body joints to analyze motion patterns. The sensor can be categorized into piezoelectric type,[11] resistive type,[12−14] capacitive type[15,16] and the others on the basis of different working mechanisms. Compared with other kinds of sensors, resistive sensors have the advantage of simplicity and reliability and can be used for signal readout and feasible device manufacturing, which makes it possible for large-scale applications. There are various requirements for the performance
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