疏水可拉伸碳纳米管/聚二甲基硅氧烷复合薄膜的性能

Performance of Hydrophobic Stretchable Carbon Nanotubes/Polydimethylsiloxane Composite Films

基于化学气相沉积制备三维多孔多壁碳纳米管(MWNTs)海绵,在其内均匀填充聚二甲基硅氧烷(PDMS)制备出碳纳米管/聚二甲基硅氧烷复合薄膜。复合PDMS的碳纳米管海绵保持着自身的三维结构,成为导电网络和力学骨架;均匀填充的PDMS使复合薄膜具有较高的拉伸性能。碳纳米管与聚二甲基硅氧烷之间的协同作用,使MWNTs/PDMS复合薄膜具有良好的力学强度(3.7 MPa)、拉伸性(207%)和弹性。MWNTs/PDMS复合薄膜对应变有稳定可靠的响应,应变为10%、20%、50%、80%和100%时电阻变化率(△R/R_(0))分别为0.9%、1.4%、2.3%、3.5%和4.6%,灵敏因子(GF)为别为0.09、0.07、0.046、0.044和0.046。MWNTs/PDMS复合薄膜的性能具有良好的稳定性,不受拉伸速度和循环次数影响。同时,MWNTs/PDMS复合薄膜还保持了碳纳米管和PDMS的疏水能力。

Three-dimensional porous multi-wall carbon nanotubes(MWNTs)sponges were prepared by chemical vapor deposition,and then which were filled with polydimethylsiloxane(PDMS).Carbon nanotubes sponges still maintain the three-dimensional structure after filled with PDMS,which provided a conductive network and mechanical framework.The uniformly filled PDMS makes the composite film stretchable and elastic.The synergistic effect between carbon nanotubes and polydimethylsiloxane resulted in high mechanical strength(3.7 MPa),stretchability(207%)and superior elasticity of MWNTs/PDMS composite films.The MWNTs/PDMS film presents the resistance change(△R/R;)of 0.9%,1.4%,2.3%,3.5%and 4.6%,and gage factor change(GF)of 0.09,0.07,0.046,0.044 and 0.046 when subjected to strain of 10%,20%,50%,80%and 100%,respectively.The sensing performance has a good stability which cannot be influenced by stretching speed and cycle numbers.In addition,the MWNTs/PDMS composite films inherited the hydrophobicity of MWNTs sponges and PDMS.