Noncovalently functionalized multi-walled carbon nanotube with core-dualshell nanostructure for improved piezoresistive sensitivity of poly(dimethyl siloxane) nanocomposites

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• 作者：Biao Zhang ^{95347380@qq.com} ; Buyin Li ; ^{libuyin@mail.hust.edu.cn} ; Shenglin Jiang ; ^{jsl@mail.hust.edu.cn}
• 关键词：A. Smart materials ; B. Electrical properties ; B. Mechanical properties ; C. Micro-mechanics
• 刊名：Composites Part A: Applied Science and Manufacturing
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：94
• 期：Complete
• 页码：124-132
• 全文大小：3787 K
• 卷排序：94

文摘

Poor sensitivity in low pressure regimes (<100 kPa) of pressure-sensitive rubbers (PSRs) is one of their major disadvantages compare to other piezoresistive materials. The reasons induced the poor sensitivity include bad dispersion and week interface of multi-walled carbon nanotubes (MWCNTs) applied in poly(dimethyl siloxane) (PDMS). A novel vinyl-terminated poly(dimethyl siloxane)-poly(phenylmethyl siloxane)-multi-walled carbon nanotubes (V-P-MWCNTs) with core-dualshell nanostructure is fabricated by noncovalently functionalized method. The V-P-MWCNTs as conductive fillers exhibits homogenous dispersion as well as good interfacial interaction in PDMS matrix. Slightly above the percolation threshold (0.19 vol.%), the PDMS-based nanocomposites with 0.2 vol.% of V-P-MWCNTs shows high piezoresistive sensitivity (22.16 × 10−3 kPa−1), high electrical conductivity (5.43 × 10−3 S/m) and low Young’s modulus (288.83 kPa). These results demonstrate that the V-P-MWCNTs are of great potential as the conductive fillers for improved piezoresistive sensitivity of PDMS nanocomposites, which can be potentially applied in the flexible touch sensors.