Piezoresistive behavior and multi-directional strain sensing ability of carbon nanotube-graphene nanoplatelet hybrid sheets
Piezoresistive behavior and multi-directional strain sensing ability of carbon nanotube-graphene nanoplatelet hybrid sheets
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DOI：
10.1088/0964-1726/22/1/015013
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发表时间：
2013-01-01
影响因子：
4.1
通讯作者：
Park, Young-Bin
中科院分区：
文献类型：
--
作者：
Hwang, Sang-Ha;Park, Hyung Wook;Park, Young-Bin
采用不同的材料组合和成分制备了由不同长度和横向尺寸的多壁碳纳米管（MWCNTs）、片状石墨纳米片（xGnPs）和纳米石墨烯片（NGPs）组成的独立碳纳米材料杂化片。当受到拉伸应变时，碳纳米材料片表现出压阻行为，其特征是电阻随施加应变而变化。同时测量放置在杂化薄片外围的多个电极之间的电阻变化，表明电阻变化与应变方向有关，这有可能实现多向应变传感。MWCNT长度、xGnP尺寸和MWCNT / xGnP/NGP比值的不同组合会导致不同的比表面积和纳米颗粒相互作用，这是控制杂化薄片灵敏度的关键因素。与MWCNT相比，纳米血小板尺寸越小、含量越高，灵敏度越高。采用由碳纳米管组成的独立薄片巴克纸作为对照材料，并讨论了混合薄片的独特特性。
Free-standing carbon nanomaterial hybrid sheets, consisting of multi-walled carbon nanotubes (MWCNTs), exfoliated graphite nanoplatelets (xGnPs) and nanographene platelets (NGPs) of different lengths and lateral dimensions, have been prepared using various material combinations and compositions. When subjected to tensile strains, the carbon nanomaterial sheets showed piezoresistive behavior, characterized by a change in electrical resistance with applied strain. Simultaneous measurement of resistance changes among multiple electrodes placed on the periphery of the hybrid sheets showed the dependence of resistance changes on strain direction, which potentially allows multi-directional strain sensing. Various combinations of MWCNT length, xGnP size and MWCNT-to-xGnP/NGP ratio result in different specific surface areas and nanoparticle interactions, which serve as critical factors for controlling the sensitivity of hybrid sheets. The smaller the nanoplatelet size and the higher the content as compared to MWCNT, the higher the sensitivity. Buckypapers, which are free-standing sheets composed of CNTs, are used as the control materials, and the unique characteristics of hybrid sheets are discussed.