Experimental investigation on surface wettability of copper-based dry bioelectrodes

Zhou, Wei; Liu, Wei; Liu, Shaoyu; Zhang, Guobiao; Shen, Zhijia

doi:10.1016/j.sna.2016.04.044

Cited by 7 publications

(3 citation statements)

References 37 publications

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“…LDW is a promising process for the easy fabrication of conductive patterns due to it being high resolution, maskless, low-cost and easy to manipulate. Various methods have been employed to fabricate microneedle arrays, including etching and lithography [ 4 , 21 , 22 , 23 , 24 , 25 ], laser machining [ 26 , 27 , 28 ], micro-molding [ 29 , 30 , 31 ], 3D printing [ 32 ], thermal drawing [ 33 ], and magnetization-induced self-assembly [ 34 , 35 ], but most of microneedle arrays were fabricated on the rigid substrates. These techniques cannot directly fabricate microneedle arrays on a flexible substrate.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Flexible Microneedle Array Electrodes for Wearable Bio-Signal Recording

Ren

Gao

et al. 2018

Sensors

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Laser-direct writing (LDW) and magneto-rheological drawing lithography (MRDL) have been proposed for the fabrication of a flexible microneedle array electrode (MAE) for wearable bio-signal monitoring. Conductive patterns were directly written onto the flexible polyethylene terephthalate (PET) substrate by LDW. The microneedle array was rapidly drawn and formed from the droplets of curable magnetorheological fluid with the assistance of an external magnetic field by MRDL. A flexible MAE can maintain a stable contact interface with curved human skin due to the flexibility of the PET substrate. Compared with Ag/AgCl electrodes and flexible dry electrodes (FDE), the electrode–skin interface impedance of flexible MAE was the minimum even after a 50-cycle bending test. Flexible MAE can record electromyography (EMG), electroencephalography (EEG) and static electrocardiography (ECG) signals with good fidelity. The main features of the dynamic ECG signal recorded by flexible MAE are the most distinguishable with the least moving artifacts. Flexible MAE is an attractive candidate electrode for wearable bio-signal monitoring.

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Section: Introductionmentioning

confidence: 99%

Fabrication of Flexible Microneedle Array Electrodes for Wearable Bio-Signal Recording

Ren

Gao

et al. 2018

Sensors

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“…As shown in Figure 6E, Zhou and colleagues conducted a study on modifying the surface of copper electrodes with complex textures using laser processing and dip coating techniques, with the aim of obtaining superamphiphobic properties through stearic acid modification. [ 143 ] The modified surface exhibited repellency towards glycerin, water, and sweat, indicating the successful achievement of superamphiphobicity that prompts the stable signal collections.…”

Section: Coupling Of Flexible Electronics With Superhydrophobicitymentioning

confidence: 99%

Durable superhydrophobic surface in wearable sensors: From nature to application

Dai,

Lei,

Ding

et al. 2023

Exploration

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The current generation of wearable sensors often experiences signal interference and external corrosion, leading to device degradation and failure. To address these challenges, the biomimetic superhydrophobic approach has been developed, which offers self‐cleaning, low adhesion, corrosion resistance, anti‐interference, and other properties. Such surfaces possess hierarchical nanostructures and low surface energy, resulting in a smaller contact area with the skin or external environment. Liquid droplets can even become suspended outside the flexible electronics, reducing the risk of pollution and signal interference, which contributes to the long‐term stability of the device in complex environments. Additionally, the coupling of superhydrophobic surfaces and flexible electronics can potentially enhance the device performance due to their large specific surface area and low surface energy. However, the fragility of layered textures in various scenarios and the lack of standardized evaluation and testing methods limit the industrial production of superhydrophobic wearable sensors. This review provides an overview of recent research on superhydrophobic flexible wearable sensors, including the fabrication methodology, evaluation, and specific application targets. The processing, performance, and characteristics of superhydrophobic surfaces are discussed, as well as the working mechanisms and potential challenges of superhydrophobic flexible electronics. Moreover, evaluation strategies for application‐oriented superhydrophobic surfaces are presented.

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“…Copper is an inexpensive material that is widely used in electrical engineering due to its remarkable electrical properties. Copper electrodes are often used to manufacture electrochemical sensing devices [48][49][50][51] (e.g., glucose sensors) and as a base for skin electrodes [52][53][54]. However, due to the high toxicity of copper and copper oxide [55][56][57], copper electrodes can not replace expensive noble metal electrodes in many important fields of bioelectronics such as impedance-based in vitro and in vivo cell and tissue studies (for example, using the ECIS method [6]), neuronal electrophysiological investigation with multi-electrode arrays [34], etc.…”

Section: Introductionmentioning

confidence: 99%

Copper–Ruthenium Composite as Perspective Material for Bioelectrodes: Laser-Assisted Synthesis, Biocompatibility Study, and an Impedance-Based Cellular Biosensor as Proof of Concept

et al. 2022

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Copper is an inexpensive material that has found wide application in electronics due to its remarkable electric properties. However, the high toxicity of both copper and copper oxide imposes restrictions on the application of this metal as a material for bioelectronics. One way to increase the biocompatibility of pure copper while keeping its remarkable properties is to use copper-based composites. In the present study, we explored a new copper–ruthenium composite as a potential biocompatible material for bioelectrodes. Sample electrodes were obtained by subsequent laser deposition of copper and ruthenium on glass plates from a solution containing salts of these metals. The fabricated Cu–Ru electrodes exhibit high effective area and their impedance properties can be described by simple R-CPE equivalent circuits that make them perspective for sensing applications. Finally, we designed a simple impedance cell-based biosensor using this material that allows us to distinguish between dead and alive HeLa cells.

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Experimental investigation on surface wettability of copper-based dry bioelectrodes

Cited by 7 publications

References 37 publications

Fabrication of Flexible Microneedle Array Electrodes for Wearable Bio-Signal Recording

Fabrication of Flexible Microneedle Array Electrodes for Wearable Bio-Signal Recording

Durable superhydrophobic surface in wearable sensors: From nature to application

Copper–Ruthenium Composite as Perspective Material for Bioelectrodes: Laser-Assisted Synthesis, Biocompatibility Study, and an Impedance-Based Cellular Biosensor as Proof of Concept

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