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Accepted (AM)Open Access (License Unspecified), Open
Journal article
A Gel‐Free Ti3C2Tx‐Based Electrode Array for High‐Density, High‐Resolution Surface Electromyography
Advanced materials technologies, v 5(8), pn/a
Aug 2020
PMID: 33693054
Abstract
Wearable sensors for surface electromyography (EMG) are composed of single‐ to few‐channel large‐area contacts, which exhibit high interfacial impedance and require conductive gels or adhesives to record high‐fidelity signals. These devices are also limited in their ability to record activation across large muscle groups due to poor spatial coverage. To address these challenges, a novel high‐density EMG array is developed based on titanium carbide (Ti3C2Tx) MXene encapsulated in parylene‐C. Ti3C2Tx is a 2D nanomaterial with excellent electrical, electrochemical, and mechanical properties, which forms colloidally stable aqueous dispersions, enabling safe, scalable solutions‐processing. Leveraging the excellent combination of metallic conductivity, high pseudocapacitance, and ease of processability of Ti3C2Tx MXene, the fabrication of gel‐free, high‐density EMG arrays is demonstrated, which are ≈8 µm thick, feature 16 recording channels, and are highly skin conformable. The impedance of Ti3C2Tx electrodes in contact with human skin is 100–1000× lower than the impedance of commercially available electrodes which require conductive gels to be effective. Furthermore, the arrays can record high‐fidelity, low‐noise EMG, and can resolve muscle activation with improved spatiotemporal resolution and sensitivity compared to conventional gelled electrodes. Overall, the results establish Ti3C2Tx‐based bioelectronic interfaces as a powerful platform technology for high‐resolution, noninvasive wearable sensing technologies.
High‐fidelity, high‐resolution recording of muscle activity from the skin surface is made possible using gel‐free Ti3C2Tx MXene contacts patterned into flexible, high‐density surface electromyography arrays. Completed devices, fabricated using scalable solution‐processing techniques and biocompatible polymeric substrates, enable tracking muscle activation and coordination across space and time in small and large muscle groups with improved quality and sensitivity over clinical standards.
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Details
- Title
- A Gel‐Free Ti3C2Tx‐Based Electrode Array for High‐Density, High‐Resolution Surface Electromyography
- Creators
- Brendan B Murphy - Corporal Michael J. Crescenz Veterans Affairs Medical CenterPatrick J Mulcahey - Georgetown UniversityNicolette Driscoll - Corporal Michael J. Crescenz Veterans Affairs Medical CenterAndrew G Richardson - University of PennsylvaniaGregory T Robbins - University of PennsylvaniaNicholas V Apollo - Corporal Michael J. Crescenz Veterans Affairs Medical CenterKathleen Maleski - Drexel UniversityTimothy H Lucas - University of PennsylvaniaYury Gogotsi - Drexel UniversityTimothy Dillingham - University of PennsylvaniaFlavia Vitale - University of Pennsylvania
- Publication Details
- Advanced materials technologies, v 5(8), pn/a
- Publisher
- Wiley
- Number of pages
- 10
- Grant note
- Mirowski Family Foundation and Neil and Barbara Smit National Science Foundation National Institutes of Health National Nanotechnology Coordinating Office (ECCS‐154253) Murata Manufacturing Co., Ltd University of Pennsylvania's Singh Center for Nanotechnology National Science Foundation Graduate Research Fellowship Program (DGE‐1845298) NIH training Fellowship in Neuroengineering and Medicine (T32NS091006) NSF (ECCS‐154253)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000541469100001
- Scopus ID
- 2-s2.0-85087171414
- Other Identifier
- 991014969773104721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary