Robust and High-Performance Electrodes via Crumpled Au-CNT Forests for Stretchable Supercapacitors

Zhou, Yihao; Cao, Changyong; Cao, Yunteng; Han, Qiwei; Parker, Charles B.; Glass, Jeffrey T.

doi:10.1016/j.matt.2020.02.024

Cited by 31 publications

(13 citation statements)

References 59 publications

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“…[ 19,20 ] However, numerous applications (e.g., stretchable interconnects, wearable displays, capacitive tactile sensors, printed circuit boards, deformable supercapacitors) demand stretchable conductors that maintain their electrical conductivity upon deformation and thus require a very low gauge factor, ideally zero. [ 21–28 ]…”

Section: Introductionmentioning

confidence: 99%

Graphene–Polyurethane Coatings for Deformable Conductors and Electromagnetic Interference Shielding

Cataldi

Papageorgiou

Pinter

et al. 2020

Adv Elect Materials

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Electrically conductive, polymeric materials that maintain their conductivity even when under significant mechanical deformation are needed for actuator electrodes, conformable electromagnetic shielding, stretchable tactile sensors, and flexible energy storage. The challenge for these materials is that the percolated, electrically conductive networks tend to separate even at low strains, leading to significant piezoresistance. Herein, deformable conductors are fabricated by spray‐coating a nitrile substrate with a graphene–elastomer solution. The electrical resistance of the coatings shows a decrease after thousands of bending cycles and a slight increase after repeated folding‐unfolding events. The deformable conductors double their electrical resistance at 12% strain and are washable without changing their electrical properties. The conductivity–strain behavior is modeled by considering the nanofiller separation upon deformation. To boost the conductivity at higher strains, the production process is adapted by stretching the nitrile substrate before spraying, after which it is released. This adaption meant that the electrical resistance doubles at 25% strain. The electrical resistance is found sufficiently low to give a 1.9 dB µm−1 shielding in the 8–12 GHz electromagnetic band. The physical and electrical properties, including the electro magnetic screening, of the flexible conductors, are found to deteriorate upon cycling but can be recovered through reheating the coating.

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Section: Introductionmentioning

confidence: 99%

Graphene–Polyurethane Coatings for Deformable Conductors and Electromagnetic Interference Shielding

Cataldi

Papageorgiou

Pinter

et al. 2020

Adv Elect Materials

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“…However, they charge and discharge rapidly with massive bursts of energy while discharging. Generally, carbon nanomaterials such as CNTs and graphene have been explored for use in supercapacitors due to their low cost, high surface area, and long cycle lifetime [ 159 ]. Chen et al demonstrated that highly stretchable supercapacitors with high electrochemical performance can easily be fabricated using a method involving the wrapping of CNT thin film synthesized by chemical vapor deposition around pre-stretched elastic wires, and twisting two of these CNT-wrapped elastic wires precoated with poly(vinyl alcohol) powder (PVA)/H 3 PO 4 /water hydrogel as the electrolyte ( Figure 13 a(i)) [ 160 ].…”

Section: Power Sourcesmentioning

confidence: 99%

“…Supercapacitors based on CNT-wrapped wire showed excellent capacitance up to 30.7 F g −1 and high stretchability of up to a strain of 350%. Cao and Zhou’s team demonstrated a facile approach of fabricating crumpled CNT forest-based supercapacitors on a pre-strained elastomer substrate ( Figure 13 c) [ 159 ]. Such a crumpled CNT forest has the advantages of easy access due to its pore structure, short ion transport time, and low ionic diffusion resistance.…”

Section: Power Sourcesmentioning

confidence: 99%

“…(ii) Capacitance retention of a uniaxially stretchable Au-CNT forest electrode under mechanical stretching–relaxation cyclic deformations to a strain of 200% and for 10,000 charge/discharge cycles at the relaxed state. Inset shows the CV curves measured before and after the electrochemical stability test at the scan rate of 500 mV s −1 [ 159 ]. Reprinted with permission from Ref.…”

Section: Figurementioning

confidence: 99%

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Flexible and Stretchable Bioelectronics

et al. 2022

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Medical science technology has improved tremendously over the decades with the invention of robotic surgery, gene editing, immune therapy, etc. However, scientists are now recognizing the significance of ‘biological circuits’ i.e., bodily innate electrical systems for the healthy functioning of the body or for any disease conditions. Therefore, the current trend in the medical field is to understand the role of these biological circuits and exploit their advantages for therapeutic purposes. Bioelectronics, devised with these aims, work by resetting, stimulating, or blocking the electrical pathways. Bioelectronics are also used to monitor the biological cues to assess the homeostasis of the body. In a way, they bridge the gap between drug-based interventions and medical devices. With this in mind, scientists are now working towards developing flexible and stretchable miniaturized bioelectronics that can easily conform to the tissue topology, are non-toxic, elicit no immune reaction, and address the issues that drugs are unable to solve. Since the bioelectronic devices that come in contact with the body or body organs need to establish an unobstructed interface with the respective site, it is crucial that those bioelectronics are not only flexible but also stretchable for constant monitoring of the biological signals. Understanding the challenges of fabricating soft stretchable devices, we review several flexible and stretchable materials used as substrate, stretchable electrical conduits and encapsulation, design modifications for stretchability, fabrication techniques, methods of signal transmission and monitoring, and the power sources for these stretchable bioelectronics. Ultimately, these bioelectronic devices can be used for wide range of applications from skin bioelectronics and biosensing devices, to neural implants for diagnostic or therapeutic purposes.

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“…An efficient control over the results of carbon synthesis may be provided by noble metal nanoparticles (NPs) serving as catalysers. As an example, the recent publication [ 2 ] demonstrated a convenient approach for fabrication of highly stretchable supercapacitors based on vertically aligned nanotubes and nanowires with embedded gold NPs that allowed achieving an exceptional and robust electrochemical performance. The graphene sheets with incorporated metal NPs [ 3 ] are highly promising for THz-generation because of the possibility to inject hot carriers from the NPs to the graphene matrix.…”

Section: Introductionmentioning

confidence: 99%

Field-Induced Assembly of sp-sp2 Carbon Sponges

et al. 2021

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The formation of macroscale carbon structures characterised by an sp-sp2-hybridization is realised by self-assembly in colloidal solutions under an effect of laser irradiation and electromagnetic fields. The sponge-like morphology, sculptured with gold nanoparticles (NPs) was revealed by Scanning Electron Microscopy (SEM) imaging. Full structural and defect characterization of the self-assembled sponges was provided using the micro-Raman spectroscopic technique. The synthesized clusters manifest themselves in the presence of a strong spectral band in the visible range of the photoluminescence spectra that is quite unusual for ordered sp2-carbon systems.

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Robust and High-Performance Electrodes via Crumpled Au-CNT Forests for Stretchable Supercapacitors

Cited by 31 publications

References 59 publications

Graphene–Polyurethane Coatings for Deformable Conductors and Electromagnetic Interference Shielding

Graphene–Polyurethane Coatings for Deformable Conductors and Electromagnetic Interference Shielding

Flexible and Stretchable Bioelectronics

Field-Induced Assembly of sp-sp2 Carbon Sponges

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