Thermally and electrically conductive multifunctional sensor based on epoxy/graphene composite

sensen han, Aron Chand, Sherif Araby, Rui Cai, Shuo Chen, Rongqiang Cheng, Hailan Kang, Qingshi Meng

    Research output: Contribution to journalArticlepeer-review

    69 Citations (Scopus)
    144 Downloads (Pure)

    Abstract

    Flexible electronics is expected to be one of the most active research areas in the next decade. In this study, a mechanically strong and flexible epoxy/GnP composite film was fabricated having a percolation threshold of electrical conductivity at 1.08 vol% GnPs and high thermal conductivity as 1.07 W m-1 K-1 at 10 vol% GnPs. The composite film shows high mechanical performance: Young's modulus and tensile strength were improved by 1344% and 66.7%, respectively, at 10 vol%. The film demonstrated high sensitivity to various mechanical loads: (i) it has gauge factors of 2 at strain range 0%-7% and 6 at range 7%-10%; (ii) it gives good electrical response with bending and twisting angles up to 180°; and (iii) it displays a good compressive load response up to 2 N where the absolute value of electrical resistance change increased by 71%. Furthermore, the film showed an excellent reliability up to 5.5 × 103 cycles with minor zero-point error. Above 20 °C, the film solely acts as a temperature sensor; upon cyclic temperature testing, the film demonstrated a stable resistive response in the range of 30-75 °C with a temperature sensitivity coefficient of 0.0063 °C-1. This flexible composite film has remarkable properties that enable it to be used as a full-fledged sensor for universal applications in aerospace, automotive and civil engineering.

    Original languageEnglish
    Article number075702
    JournalNanotechnology
    Volume31
    Issue number7
    Early online date22 Oct 2019
    DOIs
    Publication statusPublished - 7 Feb 2020

    Keywords

    • Electrical and thermal conductivity
    • Epoxy
    • Graphene
    • Sensor
    • Strain

    ASJC Scopus subject areas

    • Bioengineering
    • Chemistry(all)
    • Materials Science(all)
    • Mechanics of Materials
    • Mechanical Engineering
    • Electrical and Electronic Engineering

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