Low-voltage, large-strain soft electrothermal actuators based on laser-reduced graphene oxide/Ag particle composites

Wang, Qian; Li, Yutao; Zhang, Tianyu; Wang, Dan-Yang; Tian, Ye; Yan, Jun-Chao; Tian, He; Yang, Yi; Yang, Fan; Ren, Tian‐Ling

doi:10.1063/1.5020918

Cited by 25 publications

(9 citation statements)

References 22 publications

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“…f Comparison of actuating speed as function of voltage. 1: Cellulose/ionic liquid/graphene 46 ; 2: Poly(styrene-alt-maleimide)/poly(vinylidene fluoride) 40 ; 3: Poly(3,4-ethylenedioxythiophene)/ poly(styrene sulfonate)/ ionic liquids 47 ; 4: Chitosan/CNT 39 ; 5: rGO/epoxy 42 ; 6: Polyurethane/CNT 45 ; 7: CNT/carbon black 41 ; 8: Polycyclooctene/CNT 42 ; 9: Polyethylene/CNT 43 ; 10: rGO/polyimide 49 ; 11: MoS 2 /Au; 51 12: PP/cellulose 48 ; 13: Graphene/Ag/polyimide 50 …”

Section: Resultsmentioning

confidence: 99%

Evaporation-induced sintering of liquid metal droplets with biological nanofibrils for flexible conductivity and responsive actuation

et al. 2019

Nat Commun

185

161

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Liquid metal (LM) droplets show the superiority in coalescing into integral liquid conductors applicable in flexible and deformable electronics. However, the large surface tension, oxide shells and poor compatibility with most other materials may prevent spontaneous coalescence of LM droplets and/or hybridisation into composites, unless external interventions (e.g., shear and laser) are applied. Here, we show that biological nanofibrils (NFs; including cellulose, silk fibroin and amyloid) enable evaporation-induced sintering of LM droplets under ambient conditions into conductive coating on diverse substrates and free-standing films. The resultants possess an insulating NFs-rich layer and a conductive LM-rich layer, offering flexibility, high reflectivity, stretchable conductivity, electromagnetic shielding, degradability and rapid actuating behaviours. Thus this sintering approach not only extends fundamental knowledge about sintering LM droplets, but also starts a new scenario of producing flexible coating and free-standing composites with flexibility, conductivity, sustainability and degradability, and applicable in microcircuits, wearable electronics and soft robotics.

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Section: Resultsmentioning

confidence: 99%

Evaporation-induced sintering of liquid metal droplets with biological nanofibrils for flexible conductivity and responsive actuation

et al. 2019

Nat Commun

185

161

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“… 50 Meanwhile, laser technologies are capable of high-efficiency, mask-free patterning, and hierarchical structuring of graphene, which is of benefit to the design and fabrication of electrothermal actuators. As typical examples, RGO- or LIG-based electrothermal actuators, including LRGO/PI, 122 Ag-LRGO/PI, 123 LRGO/polyethylene (LRGO/PE), 124 PI/LIG/PVDF, 125 GO/RGO/tape, 126 and PI/LIG/PDMS 39 structures have been successfully developed, demonstrating sophisticated deformation ability. The hierarchical structure of graphene plays an important role for the performances of ERAs.…”

Section: Mechanismsmentioning

confidence: 99%

“…Significantly, the bending motions show abilities in kicking, hooking, and grasping. 117 , 120 , 123 , 125 , 142 141 , For example, Tabassian et al. fabricated high-performance grapple robots consisting of four ionic actuator arms; the hybrid electrodes are composed of hollow tubular graphene mesh (GM) and N-doped crumpled RGO (NG).…”

Section: Mechanismsmentioning

confidence: 99%

Electro-responsive actuators based on graphene

Zhang

Zhou

et al. 2021

The Innovation

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Electro-responsive actuators (ERAs) hold great promise for cutting-edge applications in e-skins, soft robots, unmanned flight, and in vivo surgery devices due to the advantages of fast response, precise control, programmable deformation, and the ease of integration with control circuits. Recently, considering the excellent physical/chemical/mechanical properties (e.g., high carrier mobility, strong mechanical strength, outstanding thermal conductivity, high specific surface area, flexibility, and transparency), graphene and its derivatives have emerged as an appealing material in developing ERAs. In this review, we have summarized the recent advances in graphene-based ERAs. Typical the working mechanisms of graphene ERAs have been introduced. Design principles and working performance of three typical types of graphene ERAs (e.g., electrostatic actuators, electrothermal actuators, and ionic actuators) have been comprehensively summarized. Besides, emerging applications of graphene ERAs, including artificial muscles, bionic robots, human-soft actuators interaction, and other smart devices, have been reviewed. At last, the current challenges and future perspectives of graphene ERAs are discussed.

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“…Wang et al reported electrothermal actuators based on rGO/Ag particle composites and polyimide. 76 Hu et al created an rGO-CNT/PDMS bimorph using a high-temperature curing method. 77 Due to the high thermal conductivity and optical absorption of the rGO-CNT film and thermal stresses in the bimorph, large magnitude and fast actuation could be achieved.…”

mentioning

confidence: 99%

“…The wavelength-dependent plasmonic excitation of Au NRs was used to drive photothermal reconfiguration and shape change including the demonstration of a walking spider robot (Figure g,h). Wang et al reported electrothermal actuators based on rGO/Ag particle composites and polyimide . Hu et al created an rGO-CNT/PDMS bimorph using a high-temperature curing method .…”

mentioning

confidence: 99%

Soft Three-Dimensional Robots with Hard Two-Dimensional Materials

Gracias

2019

ACS Nano

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Inspired by biological organisms, soft engineered robots seek to augment the capabilities of rigid robots by providing safe, compliant, and flexible interfaces for human–machine interactions. Soft robots provide significant advantages in applications ranging from pick-and-place, prostheses, wearables, and surgical and drug-delivery devices. Conventional soft robots are typically composed of elastomers or gels, where changes in material properties such as stiffness or swelling control actuation. However, soft materials have limited electronic and optical performance, mechanical rigidity, and stability against environmental damage. Atomically thin two-dimensional layered materials (2DLMs) such as graphene and transition metal dichalcogenides have excellent electrical, optical, mechanical, and barrier properties and have been used to create ultrathin interconnects, transistors, photovoltaics, photocatalysts, and biosensors. Importantly, although 2DLMs have high in-plane stiffness and rigidity, they have high out-of-plane flexibility and are soft from that point of view. In this Perspective, we discuss the use of 2DLMs either in their continuous monolayer state or as composites with elastomers and hydrogels to create soft three-dimensional (3D) robots, with a focus on origami-inspired approaches. We classify the field, outline major methods, and highlight challenges toward seamless integration of hybrid materials to create multifunctional robots with the characteristics of soft devices.

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Low-voltage, large-strain soft electrothermal actuators based on laser-reduced graphene oxide/Ag particle composites

Cited by 25 publications

References 22 publications

Evaporation-induced sintering of liquid metal droplets with biological nanofibrils for flexible conductivity and responsive actuation

Evaporation-induced sintering of liquid metal droplets with biological nanofibrils for flexible conductivity and responsive actuation

Electro-responsive actuators based on graphene

Soft Three-Dimensional Robots with Hard Two-Dimensional Materials

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