A strain gauge that uses carbon black and carbon nanotube doped silicone oil encapsulated in a PDMS microchannel

Ching Hsiang Cheng, Lidan Xiao, Yin Nee Cheung, Chen Chao, Mo Yang, King Lun Kwok, Po Fat Chong, Woon Fong Leung

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

2 Citations (Scopus)

Abstract

We present a piezoresistive strain gauge fabricated using electrically conductive silicone oil encapsulated in a close volume polydimethylsiloxane (PDMS) microchannel. The conductive silicone oil is made using carbon black and carbon nanotube to dope the silicone oil to become conductive. A characteristic of the electrical resistance versus the applied pulling force was measured. The non-linear behavior was due to the large deformation of the strain gauge, which makes the second order term of the increasing gauge length can not be ignored. An exponentially decrease of the resistance was found when applying a biasing voltage without exerting a force. It is caused by the reorganization of the carbon black particles in the silicone oil with applying electrical field. Temperature change also gave effect on the strain gauge with positive and negative temperature coefficients (PTC and NTC) with turning point at 55°C.
Original languageEnglish
Title of host publication2007 7th IEEE International Conference on Nanotechnology - IEEE-NANO 2007, Proceedings
Pages1199-1202
Number of pages4
DOIs
Publication statusPublished - 1 Dec 2007
Event2007 7th IEEE International Conference on Nanotechnology - IEEE-NANO 2007 - Hong Kong, Hong Kong
Duration: 2 Aug 20075 Aug 2007

Conference

Conference2007 7th IEEE International Conference on Nanotechnology - IEEE-NANO 2007
CountryHong Kong
CityHong Kong
Period2/08/075/08/07

Keywords

  • Carbon black
  • Carbon nanotube
  • Microchannel
  • PDMS
  • Silicone oil
  • Strain gauge

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics

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