可拉伸导体的印刷制备概述

doi:10.11896/cldb.19060060

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Abstract Wearable electronic device can be used in electronic skin, human motion monitoring, medical and health industry, it becomes one of research hotspots in the field of printed electronics. However, the unobtrusiveness of wearable electronic devices is an important challenge for wearable electronic applications. Stretchable conductor is the key technology to minimize the unobtrusiveness of wearable electronic devices.
According to the preparation method, stretchable conductors can be divided into two categories. One is directly use of the essential and stretc-hable functional materials to achieve reliable conductance to resist strain. The mechanical stability of conductive networks can be improved by mixing conductive fillers with elastic polymers or embedding them into elastic substrates, and the conductive components are difficult to fall off from the substrates. The conductors fabricated by this method have limited tensile properties (generally less than 30% deformation, resistance will be increased by more than two times if more than 40% deformation), or poor electrical conductivity due to the presence of a large number of insulating elastic polymers. The other is to integrate the elements with different functions by structure design to obtain reliable conductance against strain. It includes connecting micro-electronic structures to form island-bridge structures by stretchable wires, or designing open grid structures to achieve stretchability by in-plane rotation. This method can withstand large strains by structure deformation, and is not essentially stretchable. However, the design and manufacture of structure are complicated, and the original morphology cannot be completely restored after repeated stretching. Thus its electrical conductivity and mechanical tensile stability is limited. Therefore, the development of stretchable electronic devices based on intrinsically fully stretchable components has attracted great attention.
In order to prepare intrinsically stretchable conductors with two-dimensional planar structure with good conductivity and mechanical stretchability, it is necessary to combine the two above methods. Elastic film with metal mask prepared by vacuum deposition and photolithography. However, these preparation processes belong to subtraction process, which is complex, costly and can not be scaled up, and it is difficult to acquire large-area electronics. Printing technology, as a fast patterning technology, can be used for the preparation of planar patterned and intrinsically stretc-hable conductors at a lower cost by using soluble and elastic composite conductive ink. Therefore, the development of elastic composite conductive ink compatible with printing equipment and process is the key technologies.
In this paper, the types and preparation of elastic composite conductive ink and printing technologies of stretchable conductor patterns are introduced. The limitations of current stretchable conductor application are analyzed, which can provide reference for breaking through the limitations of wearable sensor application.

Key words： stretchable conductor printing technologies conductivity stretchability

Published: 05 November 2020

CLC number:

TS05

Fund:This work was financially supported by Beijing Institute of Graphic Communication Technology Innovation Service Capacity Building (Ea201803), Green Printing and Publishing Collaborative Innovation Center Construction (2011), Teacher Team Internationalization Ability Improvement of Beijing Institute of Graphic Communication (12000400001).

About author:: Meijia Yan received her B.E. degree in packaging engineering from Henan University of Science and Technology in 2017. She is currently pursuing her M.S. at the Printed Electronics Engineering Research Center, Beijing Institute of Graphic Communication. Her research has focused on flexible stretchable electrodes.
Zhiqing Xin received his B.E. degree in printing from Beijing Institute of Graphic Communication in 2001 and received his Ph.D. degree in physics and chemistry from the Institute of Chemistry, Chinese Academy of Sciences, in 2013. He is currently a full associate professor in Beijing Institute of Graphic Communication. His research interests are inorganic conductive mate-rials, flexible printed devices, advanced printing technologies, field-induced polymer electroluminescent devices for flat panel displays and solid state lighting, and polymer and perovskite solar cells for energy conversion.

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	YAN Meijia
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	LIU Jianghao
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Cite this article:

YAN Meijia,GU Lingya,LIU Jianghao, et al. Overview of Preparation of Stretchable Conductors by Printing[J]. Materials Reports, 2020, 34(19): 19122-19127.

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http://www.mater-rep.com/EN/10.11896/cldb.19060060 OR http://www.mater-rep.com/EN/Y2020/V34/I19/19122

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