Fabrication and characterization study of ultrathin multi-walled carbon nanotubes/polydimethylsiloxane composite membranes for strain sensing application,Polymer Composites

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Fabrication and characterization study of ultrathin multi-walled carbon nanotubes/polydimethylsiloxane composite membranes for strain sensing application
Polymer Composites ( IF 4.8 ) Pub Date : 2022-06-28 , DOI: 10.1002/pc.26842
Yuyao Li ₁ , Xinyue Liu ₁ , Jie Liu ₁ , Shan Xiang ₁

Affiliation

Conductive polymer composite membranes such as multi-walled carbon nanotubes (MWCNTs)/polydimethylsiloxane (PDMS) membranes are important for flexible strain sensors. However, ultra-thin MWCNTs/PDMS films (<20 μm) have rarely been studied, mainly due to inherent difficulties in fabricating processes such as the peeling and transferring. In this work, the filtration-from-suspension (FFS) method was used to fabricate ultra-thin layer of MWCNTs (buckypapers, BPs). Subsequently, spin-coating PDMS on the BPs was carried out, and the penetration of PDMS into BPs was promoted under vacuum conditions to obtain the MWCNTs/PDMS composite films. The elastic nature of PDMS assisted in peeling the composite films off the filter papers. Compared with the other methods, the fabrication method of MWCNTs/PDMS membranes in this paper is more time-efficient and reliable. A comprehensive study on the fabricated MWCNTs/PDMS membranes with different compositions was carried to understand the mechanical and electrical performance under static and cyclic loading conditions. The obtained stress–strain and resistance-strain curves show that the modulus of the MWCNTs/PDMS membrane can be significantly increased over 8–10 times compared with pure PDMS membranes. The near exponential relationship between the resistance change versus the strain implies the MWCNTs/PDMS membranes are suitable for strain sensors. Moreover, we find there is a stability transition point in thickness at which the MWCNTs/PDMS composite membrane exhibits the best overall integrated performance. At this point, the changes before and after cyclic loading/unloading on composite membranes is almost negligible, implying the good reliability of the sensing membranes. This study has demonstrated the feasibility of fabricating ultrathin MWCNTs/PDMS membranes for wearable sensors.

中文翻译：

用于应变传感应用的超薄多壁碳纳米管/聚二甲基硅氧烷复合膜的制备和表征研究

导电聚合物复合膜如多壁碳纳米管 (MWCNT)/聚二甲基硅氧烷 (PDMS) 膜对于柔性应变传感器非常重要。然而，超薄 MWCNTs/PDMS 薄膜（<20 μm）很少被研究，主要是由于剥离和转移等制造工艺的固有困难。在这项工作中，采用悬浮过滤 (FFS) 方法制备 MWCNTs (buckypapers, BPs) 的超薄层。随后，在BPs上旋涂PDMS，并在真空条件下促进PDMS向BPs中的渗透，得到MWCNTs/PDMS复合薄膜。PDMS 的弹性特性有助于将复合膜从滤纸上剥离。与其他方法相比，本文提出的 MWCNTs/PDMS 膜的制备方法更省时、更可靠。对制备的具有不同成分的 MWCNTs/PDMS 膜进行了综合研究，以了解静态和循环负载条件下的机械和电气性能。得到的应力-应变和电阻-应变曲线表明，与纯 PDMS 膜相比，MWCNTs/PDMS 膜的模量可以显着增加 8-10 倍以上。电阻变化与应变之间的近似指数关系意味着 MWCNTs/PDMS 膜适用于应变传感器。此外，我们发现MWCNTs/PDMS复合膜在厚度上存在一个稳定性转变点，在该点处表现出最佳的整体综合性能。在此刻，复合膜循环加载/卸载前后的变化几乎可以忽略不计，这意味着传感膜具有良好的可靠性。该研究证明了为可穿戴传感器制造超薄 MWCNTs/PDMS 膜的可行性。

更新日期：2022-06-28

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