Multi-scale simulations on piezoresistivity of carbon nanofiller/polymer nanocomposites and fabrication of ultrasensitive piezoresistivenanocomposite strain sensors

讲座名称：Multi-scale simulations on piezoresistivity of carbon nanofiller/polymer nanocomposites and fabrication of ultrasensitive piezoresistivenanocomposite strain sensors 

讲座时间：2017年5月8日14:30-16:30

讲座地点：明志楼B507

主讲人：胡宁教授（重庆大学）

Abstract

In this work, firstly, based on effective multi-scale numerical modeling and simulations, three possible mechanisms of piezoresistivity in polymer nanocomposites with carbon nanofiller (CNF, e.g., carbon nanotube and carbon nanofiber), i.e., 1) variation of conductive networks formed by CNFs; 2) tunneling resistance change in neighboring CNFs and 3) piezoresistivity of CNFs themselves, have been systematically explored. Based on the numerically obtained knowledge for the working mechanisms of the piezoresistivity, a set of resistance-type strain sensors has been fabricated from metal-coated CNF/epoxy nanocomposites. Two nanofillers, i.e., multi-walled carbon nanotubes (MWCNTs) and vapor growth carbon nanofibers (VGCFs) with nickel, copper and silver coatings were used. The ultrahigh strain sensitivity was observed in these novel sensors as compared to the sensors made from the CNFs without metal-coating, and conventional strain gauges. In terms of gauge factor, the sensor made of VGCFs with silver coating is estimated to be 155, which is around 80 times higher than that in a metal-foil strain gauge. In experiments, the possible mechanism responsible for the high sensitivity and its dependence with the networks of the CNFs with and without metal-coating and the geometries of the CNFs were further investigated thoroughly.

主讲人简介

胡宁博士1991年于重庆大学获得博士学位(西交大完成博士论文)，先后在南京航空航天大学、日本东北大学、清华大学、约翰•霍普金斯大学、日本千叶大学、湖南大学等单位工作。2009年出任日本千叶大学教授、2013年回国前任日本千叶大学机械系主任、人工系统科学专攻长。目前任重庆大学航空航天学院院长、澳洲昆士兰科技大学兼职教授、南京航空航天大学和西南科技大学的客座教授。

主办：机电工程学院

石油天然气装备教育部重点实验室

科研处

成都市机械工程学会机械设计分会石油天然气装备分会

数理力学研究中心