After 1000 destructive testing, repairing electrical efficiency up to 100% of highly conductive nanocomposite

Fixes moldable conductive material and received widespread attention in the field of artificial skin electronics, bioelectronics and things like. Since the response of the recoverable mechanical / electrical damages or external stimuli, repair material is an important component of high-performance electronic devices. However, the practical application of the conductive repair material and low in irreversible degradation after breaking / repair cycle hampered. Sungkyunkwan University Daewoo Suh and other researchers reported a highly conductive, fully reversible electron tunneling assisted silver nano-satellite (Agns) particle percolation network, preparing a moldable putty-like nanocomposite and repairable. The electrical conductivity of the material increases greatly, since the percolation networks rely on electron tunneling rather than physical bonding the filler, even after the 1000 fracture / repair cycle able to maintain 100% electrical efficiency of repair , and still have a high stability in case of flooding and exposed to ambient air for 6 months. This high conductivity moldable nanocomposite can be applied to improve the repair and electrical parts, has wide potential applications in the future field of electronic materials!

AgNS-AgFL-SR nanocomposite preparation

1, using tetrahydrofuran (THF) Peroxidase repairable in the silicone rubber (SR) matrix silver flakes (AgFLs) uniquely severe etching and reactive oxygen free radical mediated, and reduction reactions to generate a hierarchical structure AgNS particles. The particles produced Agns AgNS-AgFL-SR nano composite material becomes dark brown color, while the nanocomposite AgFL-SR (AgFLs in with THF SR process) as a light gray.

Figure 1. Synthesis and chemistry of the particles of the layered structure Agns schematic

AgNS-AgFL-SR nanocomposites electrical transmission performance [123 ] Figure 2 shows AgNS-AgFL-SR nanocomposites conductivity σ THF initial amount of the peroxide with the mixture changes. AgFL-SR samples without peroxide THFSynthesis under conditions which σ is only 8.64 × 10-3 Scm-1. In the optimum amount of peroxide THF (15ml), the conductivity increased about 5 orders of magnitude. This is surprising, since only by electron tunneling through AgNS particles without filler cure inducing physical bonding, to construct a high electrical conductivity percolation network.

The conductivity versus the amount of peroxide in the initial mixture of THF FIG 2.AgNS-AgFL-SR nanocomposite.

electrical transmission and repair mechanism AgNS-AgFL-SR nano good composite material Figure 3 shows AgNS-AgFL-SR nanocomposites mechanical and electrical repair process. Repairability is generally derived from dynamic chemically polymer. Because SR contains both contain hydrogen bond donor and hydrogen bond acceptor, so it\’s repairable due to hydrogen bonds. Bifurcated AgNS-AgFL-SR nanocomposite by finger touch from about 2 s to fix (FIGS. 3a and b). Figure 3c shows the change AgNS-AgFL-SR nanocomposite fracture / repair cycle resistance R. After the specimen bifurcation, R increases to infinity. Gently touching bifurcated sample immediately restored to its initial value, even after 1000 fracture / repair cycle, σ AgNS-AgFL-SR nanocomposites can still be fully restored (repairing electrical efficiency of about 100%) (FIG. 3d ).

FIG 3.AgNS-AgFL-SR schematic repairable electrical transmission Nanocomposites

AgNS-AgFL-SR moldable nanocomposite of the Figure 4 shows the macro and micro moldability AgNS-AgFL-SR excellent nano composites. It can be easily formed in various shapes by a simple molding process.

FIG 4.AgNS-AgFL-SR nanocomposite macroscopic and microscopic scale

Application of presentation using robotic AgNS-AgFL -SR nanocomposites emergency repairs electronic presentations, as shown in FIG. This is due to the toxic gas leak andAccidents caused by high temperatures that humans can not enter the place of occurrence is very useful. An exhaust fan connected to the nanocomposite repairable circuit, the circuit is heated to 200 ° C, the removal of toxic gases (FIG. 5a) under severe conditions. Analog circuit is cut off, the accumulation of toxic gas and gas concentration higher than the safe level (FIG. 5b and c). A robot is sent to the emergency site, repaired AgNS-AgFL-SR circuit (FIG. 5d). Restart fan discharge toxic gases, and the gas concentration dropped below a safe level (FIG. 5e).

FIG. 5 AgNS-AgFL-SR nanocomposite demonstrates robotic applications

summed In this article, the researchers preparing a moldable putty-like and fixes AgNS-AgFL-SR nanocomposite. The conductivity of the material is increased by about 5 orders of magnitude, still maintaining electrical repair efficiency of 100% even after 1000 times of breaking / repair cycle, and still having stability in case of flooding and exposed to ambient air for 6 months. The article also referred to the emergency electronic maintenance demonstration of the robot. We believe that this high electrical conductivity, moldability, repairable and stable AgNS-AgFL-SR nanocomposites in the next field of electronic materials can be a good application. Original link: https: //www.nature.com/articles/s41467-020-15709-8

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