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

講座時間：2017年5月8日14:30-16:30

講座地點：明志樓B507

主講人：胡寧教授（重慶大學）

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.

主講人簡介

胡寧博士1991年于重慶大學獲得博士學位(西交大完成博士論文)，先后在南京航空航天大學、日本東北大學、清華大學、約翰?霍普金斯大學、日本千葉大學、湖南大學等單位工作。2009年出任日本千葉大學教授、2013年回國前任日本千葉大學機械系主任、人工系統科學專攻長。目前任重慶大學航空航天學院院長、澳洲昆士蘭科技大學兼職教授、南京航空航天大學和西南科技大學的客座教授。

主辦：機電工程學院

???石油天然氣裝備教育部重點實驗室

科研處

成都市機械工程學會?機械設計分會石油天然氣裝備分會

數理力學研究中心