Integration of patterned electrolyte film and sacrificial substrate serpentine electrode of low curvature for high stretch supercapacitor, physiological signal detection

Xu, Jianxin; Li, Yang; Liu, Huan; Wang, Jing; Wang, Junyao; Hou, Qi; Pan, Hongxu; Quan, Jingran; Liu, Yahao; Li, Lixiang; Chen, Yansong; Yang, Hanbo; Gao, Guojun

doi:10.1016/j.cej.2023.144907

Cited by 7 publications

(1 citation statement)

References 48 publications

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“…Therefore, it has become a new possibility to generate microelectrical energy to power other wearable flexible electronics by TENG harvesting human body movements. A supercapacitor (SC) is an energy storage device that can store low voltage micronano energy with integrated miniaturization and long cycle stability. − For example, Wang’s research group used a sacrificial low-curvature serpentine-structured electrode substrate and integrated nanosized electrolyte films to form a high-stretch supercapacitor. It has excellent specific capacitance and low skin contact impedance.…”

Section: Introductionmentioning

confidence: 99%

Graphene/Carbon Nanotube Conductive Ink-Based Biomimetic Structure for Self-Powered Flexible Medical Monitoring Devices

Wang,

Li,

Liu

et al. 2024

ACS Appl. Nano Mater.

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Soft wearable sensing devices have attracted extensive research attention in the fields of e-skin and human health monitoring due to the advantages of integrated functions and good biocompatibility. However, existing sensors are unable to achieve a highly sensitive response over a wide sensing range. In addition, the sensors require an external power supply during utilization. To overcome this key challenge, in this paper, we propose a conductive ink of GN-CNTs prepared with graphene and carbon nanotubes as conductive fillers and N,N-dimethylformamide as the solvent. A self-powered flexible wearable sensing microsystem with a bionic round-leaf motherwort structure is constructed using a thermoplastic polyamide film as a flexible substrate. The bionic round-leaf motherwort structure (BRMS), which can reduce the stress concentration distribution, can obtain a larger tensile strain range. The prepared BRMS flexible electrodes can be used for electrocardiography (ECG) signal acquisition and recording at three different sites such as the chest, fingertip, and wrist. The flexible electrodes have a higher ECG signal amplitude and signal-to-noise ratio. The friction layer electrodes are printed with conductive ink prepared by printing GN-CNT conductive inks. Following this, a friction nanogenerator is assembled to collect low-frequency mechanical energy. Supercapacitors were prepared by an assembly process using conductive silver paste and GN-CNT conductive ink coating. There is no obvious capacitance decay phenomenon under different angles and other deformation states, and it has an excellent energy storage performance. In this sensing microsystem, strain sensors and flexible electrodes can be directly driven from a power source consisting of a friction nanogenerator and a supercapacitor. It can be used for a long time for low-power detection of human motion detection and medical ECG monitoring.

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Section: Introductionmentioning

confidence: 99%

Graphene/Carbon Nanotube Conductive Ink-Based Biomimetic Structure for Self-Powered Flexible Medical Monitoring Devices

Wang,

Li,

Liu

et al. 2024

ACS Appl. Nano Mater.

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Flexible Pressure, Humidity, and Temperature Sensors for Human Health Monitoring

Li,

Fang,

Wei

et al. 2024

Adv Healthcare Materials

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The rapid advancements in artificial intelligence, micro‐nano manufacturing, and flexible electronics technology have unleashed unprecedented innovation and opportunities for applying flexible sensors in healthcare, wearable devices, and human–computer interaction. The human body's tactile perception involves physical parameters such as pressure, temperature, and humidity, all of which play an essential role in maintaining human health. Inspired by the sensory function of human skin, many bionic sensors have been developed to simulate human skin's perception to various stimuli and are widely applied in health monitoring. Given the urgent requirements for sensing performance and integration of flexible sensors in the field of wearable devices and health monitoring, here is a timely overview of recent advances in pressure, humidity, temperature, and multi‐functional sensors for human health monitoring. It covers the fundamental components of flexible sensors and categorizes them based on different response mechanisms, including resistive, capacitive, voltage, and other types. Specifically, the application of these flexible tactile sensors in the area of human health monitoring is highlighted. Based on this, an extended overview of recent advances in dual/triple‐mode flexible sensors integrating pressure, humidity, and temperature tactile sensing is presented. Finally, the challenges and opportunities of flexible sensors are discussed.

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Trunk-Inspired SWCNT-Based Wrinkled Films for Highly-Stretchable Electromagnetic Interference Shielding and Wearable Thermotherapy

Gong,

Hu,

Zhang

et al. 2024

Nano-Micro Lett.

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Nowadays, the increasing electromagnetic waves generated by wearable devices are becoming an emerging issue for human health, so stretchable electromagnetic interference (EMI) shielding materials are highly demanded. Elephant trunks are capable of grabbing fragile vegetation and tearing trees thanks not only to their muscles but also to their folded skins. Inspired by the wrinkled skin of the elephant trunks, herein, we propose a winkled conductive film based on single-walled carbon nanotubes (SWCNTs) for multifunctional EMI applications. The conductive film has a sandwich structure, which was prepared by coating SWCNTs on both sides of the stretched elastic latex cylindrical substrate. The shrinking-induced winkled conductive network could withstand up to 200% tensile strain. Typically, when the stretching direction is parallel to the polarization direction of the electric field, the total EMI shielding effectiveness could surprisingly increase from 38.4 to 52.7 dB at 200% tensile strain. It is mainly contributed by the increased connection of the SWCNTs. In addition, the film also has good Joule heating performance at several voltages, capable of releasing pains in injured joints. This unique property makes it possible for strain-adjustable multifunctional EMI shielding and wearable thermotherapy applications.

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Integration of patterned electrolyte film and sacrificial substrate serpentine electrode of low curvature for high stretch supercapacitor, physiological signal detection

Cited by 7 publications

References 48 publications

Graphene/Carbon Nanotube Conductive Ink-Based Biomimetic Structure for Self-Powered Flexible Medical Monitoring Devices

Graphene/Carbon Nanotube Conductive Ink-Based Biomimetic Structure for Self-Powered Flexible Medical Monitoring Devices

Flexible Pressure, Humidity, and Temperature Sensors for Human Health Monitoring

Trunk-Inspired SWCNT-Based Wrinkled Films for Highly-Stretchable Electromagnetic Interference Shielding and Wearable Thermotherapy

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