Surface Design of Nanocrystals for High-Performance Multifunctional Sensors in Wearable and Attachable Electronics

Hyungmok Joh, Woo Seok Lee, Min Su Kang, Mingi Seong, Haneun Kim, Junsung Bang, Seung Wook Lee, Md Ashraf Hossain, Soong Ju Oh

    Research output: Contribution to journalArticlepeer-review

    36 Citations (Scopus)

    Abstract

    Multifunctional temperature-strain sensors that can simultaneously detect temperature and strain are fabricated through all-solution processes using colloidal Ag nanocrystals (NCs). Material and architecture design are introduced to efficiently distinguish signals, allowing accurate measurement from one sensor device. For material design, a ligand-exchange and reduction process is developed to increase the sensitivity. As a result, higher temperature coefficients of resistance, lower resistivity, and lower gauge factor values are observed. Furthermore, a partial oxidation process is used to widen the sensing range above 673 K, which overcomes the most challenging issue of nanomaterial-based sensors. For architecture design, three-dimensional mirror-stacked layer structures are fabricated at the top and bottom layers of the neutral mechanical plane for effective strain decoupling. Our twofold strategy provides a low-cost, simple, single-material-based method to achieve highly metallic thin films constructed on flexible substrates. Our sensor platforms can be fabricated on numerous substrates with a high pixel density for high spatial resolution, and we expect that they can be used for a variety of applications such as bioelectronics and robotics.

    Original languageEnglish
    Pages (from-to)436-444
    Number of pages9
    JournalChemistry of Materials
    Volume31
    Issue number2
    DOIs
    Publication statusPublished - 2019 Jan 22

    Bibliographical note

    Funding Information:
    This research was supported by the Nano-Material Technology Development Program (2009-0082580) and by the Basic Science Research Program (2016R1C1B2006534) through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning and Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (NRF-2018M3D1A1059001).

    Publisher Copyright:
    © 2018 American Chemical Society.

    ASJC Scopus subject areas

    • General Chemistry
    • General Chemical Engineering
    • Materials Chemistry

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