Jeong Changyoon, Park Young-Bin
Department of Mechanical Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Republic of Korea.
ACS Omega. 2020 Feb 3;5(6):2630-2639. doi: 10.1021/acsomega.9b03012. eCollection 2020 Feb 18.
In this study, we investigated the gauge factor and compressive modulus of hybrid nanocomposites of exfoliated graphite nanoplatelets (xGnP) and multiwalled carbon nanotubes (MWCNTs) in a polydimethylsiloxane matrix under compressive strain. Mechanical and electrical tests were conducted to investigate the effects of nanofiller wt %, the xGnP size, and xGnP:MWCNT ratio on the compressive modulus and sensitivity of the sensors. It was found that nanofiller wt %, the xGnP size, and xGnP:MWCNT ratio significantly affect the electromechanical properties of the sensor. The compressive modulus increased with an increase in the nanofiller wt % and a decrease in the xGnP size and xGnP:MWCNT ratio. However, the gauge factor decreases with a decrease in the nanofiller wt % and xGnP size and an increase in the xGnP:MWCNT ratio. Therefore, by investigating the piezoresistive effects of various factors for sensing performance, such as wt %, xGnP size, and xGnP:MWCNT ratio, the concept of one- and two-dimensional hybrid fillers provides an effective way to tune both mechanical properties and sensitivity of nanocomposites by tailoring the network structure of fillers.
在本研究中，我们研究了在压缩应变下，聚二甲基硅氧烷基体中剥离石墨纳米片（xGnP）和多壁碳纳米管（MWCNT）的混合纳米复合材料的应变片系数和压缩模量。进行了力学和电学测试，以研究纳米填料重量百分比、xGnP尺寸以及xGnP与MWCNT的比例对传感器压缩模量和灵敏度的影响。结果发现，纳米填料重量百分比、xGnP尺寸以及xGnP与MWCNT的比例显著影响传感器的机电性能。压缩模量随纳米填料重量百分比的增加、xGnP尺寸的减小以及xGnP与MWCNT比例的减小而增加。然而，应变片系数随纳米填料重量百分比和xGnP尺寸的减小以及xGnP与MWCNT比例的增加而降低。因此，通过研究诸如重量百分比、xGnP尺寸以及xGnP与MWCNT比例等各种因素对传感性能的压阻效应，一维和二维混合填料的概念提供了一种通过调整填料网络结构来调节纳米复合材料力学性能和灵敏度的有效方法。
