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

24 Citations (Scopus)


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
Issue number2
Publication statusPublished - 2019 Jan 22

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry


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