Tailoring mechanical and electrical properties of polydimethylsiloxane nanocomposites With graphene and carbon nanotubes for wearable electronics

Sheng-Yang Huang, Tair-I Wu, C. Chou, Vincent K. S. Hsiao
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Abstract

We explored the use of soft and flexible graphene (Gr)-reinforced polydimethylsiloxane (PDMS; Gr-PDMS) and Gr-carbon nanotube (CNT)-reinforced PDMS (Gr-CNT-PDMS) as nanocomposites (NCPs) in wearable electronic applications and investigated their mechanical and electrical properties. Specifically, we evaluated the mechanical reinforcement of the NCPs by performing Shore scleroscope hardness and machine-washing tests and evaluated their electrical properties by using a four-point probe. The results revealed that as the Gr or CNT concentrations increased, the NCPs’ hardness and surface resistance increased and decreased, respectively. Scanning electron microscopy revealed the formation of layered polymeric structures in the Gr-PDMS NCPs, contributing to the increase in hardness and decrease in surface resistance. Furthermore, bending tests revealed that changes in resistance were positively correlated with the Gr concentration. PDMS with low Gr concentrations exhibited no substantial changes in surface resistance after bending tests. However, for PDMS, as the Gr concentration increased (>5 wt.%), the cross-sectional morphology observed after 500 bending cycles differed substantially from that before observed bending tests. Additionally, the influence of one-dimensional (CNT) and two-dimensional (Gr) nanomaterials on the mechanical and electrical properties of the flexible PDMS samples was investigated. The aim of this study is to highlight the importance of considering the properties of different nanomaterials in developing high-performance NCPs for wearable electronics.
用于可穿戴电子产品的石墨烯和碳纳米管聚二甲基硅氧烷纳米复合材料的机械和电气性能
我们探索了柔性石墨烯(Gr)增强聚二甲基硅氧烷(PDMS;Gr-PDMS)和gr -碳纳米管(CNT)增强的PDMS (Gr-CNT-PDMS)作为纳米复合材料(ncp)在可穿戴电子领域的应用,并研究了它们的力学和电学性能。具体来说,我们通过肖氏硬度和机洗测试评估了ncp的机械强度,并使用四点探针评估了它们的电性能。结果表明,随着碳纳米管浓度的增加,ncp的硬度和表面电阻分别增大和减小。扫描电镜显示,Gr-PDMS ncp中形成层状聚合物结构,有助于提高硬度和降低表面阻力。此外,弯曲试验表明,电阻的变化与Gr浓度呈正相关。低Gr浓度的PDMS在弯曲试验后表面电阻没有明显变化。然而,对于PDMS,随着Gr浓度的增加(>5 wt.%), 500次弯曲循环后观察到的横截面形貌与观察弯曲试验前的横截面形貌有很大不同。此外,还研究了一维(CNT)和二维(Gr)纳米材料对柔性PDMS样品力学和电学性能的影响。本研究的目的是强调在开发用于可穿戴电子产品的高性能ncp时考虑不同纳米材料特性的重要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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