基于室温液态金属薄膜的纸基柔性导线研究
发布时间：2018-11-26 16:11
【摘要】：纸基电子器件是以环保经济的纸质材料为基底的柔性电子器件,相对于以高分子聚合物材料作为基底的柔性电子器件,其能够在对折、褶皱等极端变形条件下正常工作,达到使用寿命后便于回收、销毁,不会造成环境的污染和资源的浪费。因此,纸基电子器件的发展是未来柔性电子器件发展的重要方向之一。而作为纸基电子器件的核心,纸基柔性导线是实现纸基柔性电子器件互联、通讯的关键,其重要性不言而喻。目前,纸基柔性导线的高电导性和高可靠性还不能兼容,采用室温液态金属作为弹性导电材料是解决这一问题的重要方案之一。但是,液态金属表面张力大、难以薄膜化是制备超薄的纸基柔性导线的技术瓶颈,此外,应力作用下,纸基液态金属导线电阻的变化规律、稳定性还不是很清楚,这限制了纸基液态金属导线的应用。针对上述问题,本文研究了纸基液态金属导线的制备技术、应力作用下电阻的变化规律及其疲劳和温度稳定性,并探索了液态金属导线在柔性互联、柔性功能器件上的应用,取得的主要结果如下:(1)厚度可控的纸基液态金属薄膜和高电导率纸基柔性导线的制备技术研究。通过超声的方式制备了液态金属微粒溶液,在纸基底表面沉积,形成液态金属薄膜。通过调控基底表面单位面积的液态金属微粒的沉积量,实现了纸基液态金属薄膜厚度7μm 115μm范围内的调控。并创新采用机械烧结的方式在纸基液态金属薄膜上制备了高电导率(3.8×104 S/cm)的纸基柔性导线。(2)应变条件下纸基柔性导线可靠性和稳定性研究。本文研究了纸基柔性导线在弯曲,对折条件下纸基导线的电阻变化规律,纸基薄膜和纸基导线在对折循环条件下工作的可靠性和稳定性,研究了导线在长时间放置以及变温条件下的稳定性。研究发现,导线在弯曲条件下随着弯曲半径的增大而减小,且近似成反比,恢复初始状态后导线电阻仅变化了0.31Ω;导线对折,电阻仅改变了0.37Ω;纸基薄膜对折循环10000次,薄膜始终绝缘,导线始终导电(变化率5%);-30℃-107℃变温条件下,导线电阻最大变化值为0.02Ω。所有这些结果都证明了纸基导线在变形条件下工作的可靠性和稳定性。(3)纸基柔性导线的实际应用演示和回收特性研究。最后,本文探索了纸基柔性导线在纸基器件中的应用及其处理问题。发现由纸基柔性导线构成的纸基电路中的电子元件,在弯折条件下仍能正常工作,并且,利用NaOH溶液能够实现液态金属材料的回收,回收效率高达95.6%,节约成本,进一步证明了纸基导线的应用价值。
[Abstract]:Paper based electronic devices are flexible electronic devices based on environmentally friendly and economical paper materials. Compared with flexible electronic devices based on polymer materials, paper based electronic devices can work normally under extreme deformation conditions, such as folding, and so on. It is easy to recycle and destroy after reaching service life, which will not cause environmental pollution and waste of resources. Therefore, the development of paper-based electronic devices is one of the important directions of flexible electronic devices in the future. As the core of paper-based electronic devices, paper-based flexible wire is the key to realize the interconnection and communication of paper-based flexible electronic devices, and its importance is self-evident. At present, the high conductivity and high reliability of paper based flexible conductors are not compatible, and the use of liquid metal at room temperature as an elastic conductive material is one of the important solutions to this problem. However, the high surface tension of liquid metal and the difficulty of thinning are the technical bottlenecks in the preparation of ultra-thin paper based flexible conductors. In addition, under the action of stress, the variation of resistance of paper based liquid metal conductors is not very clear, and the stability of paper based liquid metal conductors is not very clear. This limits the application of paper-based liquid metal conductors. In order to solve the above problems, the preparation technology of paper based liquid metal conductors, the variation law of resistance under stress and its fatigue and temperature stability are studied in this paper. The application of liquid metal conductors in flexible interconnection and flexible functional devices is also explored. The main results are as follows: (1) the preparation technology of liquid metal film and paper based flexible wire with high conductivity is studied. Liquid metal particle solution was prepared by ultrasonic method and deposited on paper substrate to form liquid metal film. By adjusting the deposition amount of liquid metal particles per unit area of the substrate, the thickness of liquid metal film on paper substrate is controlled in the range of 7 渭 m ~ 115 渭 m. The paper based flexible conductors with high conductivity (3. 8 脳 10 ~ 4 S/cm) were prepared by mechanical sintering. (2) the reliability and stability of paper based flexible conductors under strain conditions were studied. In this paper, the resistance variation of paper based flexible conductors under bending and folding conditions is studied, and the reliability and stability of paper based film and paper based conductors working under the condition of folding cycle are studied. The stability of the conductor under the condition of long time placement and variable temperature is studied. It is found that the wire resistance changes only 0.31 惟 after the initial state is restored, and the resistance changes only 0.37 惟 when the wire fold, and decreases with the increase of the bending radius, and is approximately inversely proportional to the bending radius. The paper based film has 10000 fold cycles, the film is always insulated, the conductor is always conductive (change rate 5%), and the maximum change value of conductor resistance is 0.02 惟 at -30 鈩，
本文编号：2359021
[Abstract]:Paper based electronic devices are flexible electronic devices based on environmentally friendly and economical paper materials. Compared with flexible electronic devices based on polymer materials, paper based electronic devices can work normally under extreme deformation conditions, such as folding, and so on. It is easy to recycle and destroy after reaching service life, which will not cause environmental pollution and waste of resources. Therefore, the development of paper-based electronic devices is one of the important directions of flexible electronic devices in the future. As the core of paper-based electronic devices, paper-based flexible wire is the key to realize the interconnection and communication of paper-based flexible electronic devices, and its importance is self-evident. At present, the high conductivity and high reliability of paper based flexible conductors are not compatible, and the use of liquid metal at room temperature as an elastic conductive material is one of the important solutions to this problem. However, the high surface tension of liquid metal and the difficulty of thinning are the technical bottlenecks in the preparation of ultra-thin paper based flexible conductors. In addition, under the action of stress, the variation of resistance of paper based liquid metal conductors is not very clear, and the stability of paper based liquid metal conductors is not very clear. This limits the application of paper-based liquid metal conductors. In order to solve the above problems, the preparation technology of paper based liquid metal conductors, the variation law of resistance under stress and its fatigue and temperature stability are studied in this paper. The application of liquid metal conductors in flexible interconnection and flexible functional devices is also explored. The main results are as follows: (1) the preparation technology of liquid metal film and paper based flexible wire with high conductivity is studied. Liquid metal particle solution was prepared by ultrasonic method and deposited on paper substrate to form liquid metal film. By adjusting the deposition amount of liquid metal particles per unit area of the substrate, the thickness of liquid metal film on paper substrate is controlled in the range of 7 渭 m ~ 115 渭 m. The paper based flexible conductors with high conductivity (3. 8 脳 10 ~ 4 S/cm) were prepared by mechanical sintering. (2) the reliability and stability of paper based flexible conductors under strain conditions were studied. In this paper, the resistance variation of paper based flexible conductors under bending and folding conditions is studied, and the reliability and stability of paper based film and paper based conductors working under the condition of folding cycle are studied. The stability of the conductor under the condition of long time placement and variable temperature is studied. It is found that the wire resistance changes only 0.31 惟 after the initial state is restored, and the resistance changes only 0.37 惟 when the wire fold, and decreases with the increase of the bending radius, and is approximately inversely proportional to the bending radius. The paper based film has 10000 fold cycles, the film is always insulated, the conductor is always conductive (change rate 5%), and the maximum change value of conductor resistance is 0.02 惟 at -30 鈩，
本文编号：2359021
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