Amphiphilic silicones for the facile dispersion of carbon nanotubes and formation of soft skin electrodes.
Amphiphilic silicones for the facile dispersion of carbon nanotubes and formation of soft skin electrodes.
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DOI：
10.1021/acsapm.2c01757
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发表时间：
2022-12
影响因子：
5
通讯作者：
A. Marmo;Lucas R. Lott;J. H. Pickett;Harrison E. Koller;Brandon M. Nitschke;M. Grunlan
中科院分区：
文献类型：
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作者：
A. Marmo;Lucas R. Lott;J. H. Pickett;Harrison E. Koller;Brandon M. Nitschke;M. Grunlan
柔性干燥皮肤电极代表了用于长期监测的可穿戴设备的标准Ag/AgCl金属电极的潜在上级替代品。在本文中，这样的电极使用用于使用定制的两亲分散添加剂（DSPA）将碳纳米管（CNT）分散在有机硅基质中的简易方法形成。仅使用简单的混合，而不使用溶剂或CNT的表面改性，将具有不同交联性、结构、硅氧烷系链长度和硅氧烷：PEO的摩尔比的十二种聚（环氧乙烷）-硅烷（PEO-SA）与加成固化有机硅和CNT组合。几乎所有的PEO-SA改性的有机硅-CNT复合材料表现出改善的导电性相比，未改性的复合材料。最佳电导率与用PEO-SA制备的复合材料相关，所述PEO-SA形成特定尺寸（d ~ 200 - 300 nm）的胶束，并且与硅氧烷：PEO摩尔比为~ 0.75 - 3.00的PEO-SA一致。通过这种PEO-SA的CNT的上级分散通过扫描电子显微镜（SEM）举例说明。有利的是，改性的复合材料保持了它们的模量，而不是变得更加刚性。用改性复合材料制成的所得电极显示出与Ag/AgCl电极相当的皮肤电极阻抗。结合起来，这些结果证明了用PEO-SA DSPA制备的有机硅-CNT复合材料作为柔性干电极作为传统电极的上级替代品的潜力。
Flexible, dry skin electrodes represent a potentially superior alternative to standard Ag/AgCl metal electrodes for wearable devices used in long-term monitoring. Herein, such electrodes were formed using a facile method for dispersing carbon nanotubes (CNTs) in a silicone matrix using custom amphiphilic dispersive additives (DSPAs). Using only brief mixing and without the use of solvents or surface modification of CNTs, twelve poly(ethylene oxide)-silanes (PEO-SAs) of varying crosslinkability, architecture, siloxane tether length, and molar ratio of siloxane:PEO were combined with an addition cure silicone and CNTs. Nearly all PEO-SA modified silicone-CNT composites demonstrated improved conductivity compared to the unmodified composite. Best conductivities correlated to composites prepared with PEO-SAs that formed micelles of particular sizes (d ~ 200 - 300 nm) and coincided to PEO-SAs with a siloxane:PEO molar ratio of ~ 0.75 - 3.00. Superior dispersion of CNT by such PEO-SAs was exemplified by scanning electron microscopy (SEM). Advantageously, modified composites retained their moduli, rather than becoming more rigid. Resultant electrodes fabricated with modified composites showed skin-electrode impedance comparable to that of Ag/AgCl electrodes. Combined, these results demonstrate the potential of silicone-CNT composites prepared with PEO-SA DSPAs as flexible, dry electrodes as a superior alternative to traditional electrodes.