Shijia Tian,Xiaonan Wang,Wenjing Qin,Shougen Yin,Taixing Tan,Yuan Tian,Cheng Wang
The exploration of flexible electronic technology has been paid great attention recently, due to their promising applications such as health monitors and artificial electronic skins. To satisfy the requirement of practical applications, flexible and stretchable electrodes need to be further optimized in terms of mechanical robustness, sensing performance, and stability in extreme environments. Here, an ultra-robust and stretchable electrod is rationally designed and successfully fabricated via the synergistic combination of in situ growing silver nanoparticles (AgNPs)/acid-modified carbon nanotubes (ACNTs) conductive networks and superamphiphobic 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane modified carbon nanotubes-silica nanoparticles (FCNTs-SiO 2 ). The obtained electrode shows a skin-like Young's modulus (2.3 MPa), high tensile strength (21.7 MPa), and good gas permeability. Owing to the conductive paths of ACNTs-bridged AgNPs, the strain sensor delivers a wide detection range of 155 %, a high gauge factor (denoted as GF) value up to 6.6 × 10 4 and a fast response time of 62 ms. The re-entrant structure constructed by spraying FCNTs-SiO 2 along with chemcial composition endows the sensor with superamphiphobicity, which allows the sensor to fulfill its function under extreme environments (such as −60 ℃ to 60 ℃, corrosive liquids and non-polar liquids). The strain sensor can be used for monitoring high-frequency exercise and human health, indicating its potential application.
Despite the fact that synthetic adhesives have achieved great progress, achieving robust dry/wet adhesion under harsh operating environments is still challenging. Herein, inspired from the extraordinary adhesion mechanism of nature mussel protein adhesive, the balanced design concept of co-adhesion and interfacial adhesion is proposed to prepare one kind of novel copolymer adhesive of [poly(dopamine methacrylamide-co-methoxethyl acrylate-co-adamantane-1-carboxylic acid 2-(2-methyl-acryloyloxy)-ethyl ester)] [p(DMA-co-MEA-co-AD)], named as super-robust adhesive (SRAD). The SRAD exhibits ultra-high interface bonding strengths in air (∼7.66 MPa) and underwater (∼2.78 MPa) against an iron substrate. Especially, a greatly tough and stable adhesion strength (∼2.11 MPa) can be achieved after immersing the bonded sample in water for half a year. Furthermore, the SRAD demonstrates surprising wet bonding robustness/tolerance even encountering harsh conditions such as fluid shearing, dynamic loading, and cyclic mechanical fretting. The great advantages of SRAD, such as strong interface bonding, stable wet adhesion underwater, and good mechanical tolerance, makes it demonstrate huge application potential in engineering sealants and underwater adhesion.
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