Magnetic-Assisted Transparent and Flexible Percolative Composite for Highly Sensitive Piezoresistive Sensor via Hot Embossing Technology

Shan Wang, Guorui Chen, Shaoyu Niu, Kaifeng Chen, Tian Gan, Zongrong Wang, Hongzhu Wang, Piyi Du, Chi Wah Leung, Shaoxing Qu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

11 Citations (Scopus)

Abstract

A highly transparent and flexible percolative composite with magnetic reduced graphene oxide@nickel nanowire (mGN) fillers in EcoFlex matrix is proposed as a sensing layer to fabricate high-performance flexible piezoresistive sensors. Large excluded volume and alignment of mGN fillers contribute to low percolation threshold (0.27 vol %) of mGN-EcoFlex composites, leading to high electrical conductivity of 0.003 S m-1, optical transmittance of 71.8%, and low Young's modulus of 122.8 kPa. Large-scale microdome templates for sensors are prepared by hot embossing technology cost-effectively and COMSOL Multiphysics is utilized to optimize the sensor performances. Piezoresistive sensors fabricated experimentally show superior average sensitivity of 1302.1 kPa-1 with a low device-to-device variation of 3.74%, which provides a new way to achieve transparent, highly sensitive, and large-scale electronic skin.

Original languageEnglish
Pages (from-to)48331-48340
Number of pages10
JournalACS Applied Materials and Interfaces
Volume11
Issue number51
DOIs
Publication statusPublished - 26 Dec 2019

Keywords

  • excluded volume
  • hot embossing
  • percolative composite
  • piezoresistive sensors
  • transparent

ASJC Scopus subject areas

  • Materials Science(all)

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