2017
DOI: 10.1021/acsami.7b04605
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Channel Crack-Designed Gold@PU Sponge for Highly Elastic Piezoresistive Sensor with Excellent Detectability

Abstract: It is a great challenge to fabricate piezoresistive sensors that possess high elasticity, large-area compliance, and excellent detectability to satisfy both extremely tiny and large human activity monitoring. Herein, a novel and facile strategy is reported to manufacture highly elastic channel crack-based gold@PU sponge piezoresistive material. The elastic 3D conductive network is successfully prepared by gold ion sputtering, and channel cracks are skillfully designed on the 3D sponge skeletons. Such novel str… Show more

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Cited by 169 publications
(114 citation statements)
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“…Although cracks are undesirable for structural designs, the generation of microcracks in conductive thin films has been successfully utilized to develop highly sensitive strain sensors. The opening and enlargement of microcracks have been observed in CNT-based strain sensors, [109,138,173,174] graphene-based strain sensors and its derivatives, [6,57,117] metal NW-and NPs [86,116,[175][176][177][178][179][180] based strain sensors. The rapid separation of nanomaterials at the microcrack edges dramatically limits the electrical conduction paths within the thin films, leading to a significant increase in the electrical resistance of strain sensors under the applied tensile strain.…”
Section: Crack Generation In Conductive Filmsmentioning
confidence: 99%
See 1 more Smart Citation
“…Although cracks are undesirable for structural designs, the generation of microcracks in conductive thin films has been successfully utilized to develop highly sensitive strain sensors. The opening and enlargement of microcracks have been observed in CNT-based strain sensors, [109,138,173,174] graphene-based strain sensors and its derivatives, [6,57,117] metal NW-and NPs [86,116,[175][176][177][178][179][180] based strain sensors. The rapid separation of nanomaterials at the microcrack edges dramatically limits the electrical conduction paths within the thin films, leading to a significant increase in the electrical resistance of strain sensors under the applied tensile strain.…”
Section: Crack Generation In Conductive Filmsmentioning
confidence: 99%
“…[1,6] Most recently, controlled crack propagation has been used as an effective mechanism to greatly promote the sensitivity of stretchable sensitive strain sensors. [6,116,145,179] For instance, a strain sensor based on the cut-through channel cracks of the Au thin film on PDMS substrate was fabricated, and the effect of the channel cracks on the sensitivity and electromechanical response were explored. [116] Amjadi et al fabricated ultrasensitive and stretchable strain sensors based on the controllable and reversible parallel microcracks in graphite films bar coated over the plasma-exposed Ecoflex elastomer (Figure 6a).…”
Section: Crack Generation In Conductive Filmsmentioning
confidence: 99%
“…Figure 6a highlights an unique structural design of fish scale like for the construction of graphene-based strain sensor (FSG). [128,129] The use of nanomaterials based on crack propagation mechanism, such as metal particles, AgNWs, AuNWs, CNT, and graphene coated on flexible substrates, offers ideal GF ranges in working strain ranges. These characteristics allowed the FSG sensor to be attached on human skin to monitor human motions such as phonation recognition and wrist pulse (Figure 6b-d).…”
Section: Wearable Strain/motion Sensorsmentioning
confidence: 99%
“…The responses of the resistance signal are similar when repeating loading/removing of the weight because the high flexibility of these two Ni‐coated sponges can prevent cracking under large deformation. As shown in Figure d,e, when the weight increased from 0 to 5 to 20 g, the surface resistance of 30 min ELD and 60 min ELD samples showed a small increase because the loaded pressure induced crack propagation in the brittle and stiff Ni film and the micro/nanocracks decreased the number of conductive pathways . When the weight further increased, although large and rapid crack propagation was promoted, more contact area occurred between sponge scaffolds, enabling dramatic increase of the conductive pathway and thus, the surface resistance decreased.…”
Section: Resultsmentioning
confidence: 93%