Journal
CHEMISTRY OF MATERIALS
Volume 31, Issue 2, Pages 436-444Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.8b03914
Keywords
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Funding
- Nano-Material Technology Development Program [2009-0082580]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Future Planning and Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) - Ministry of Science and [2016R1C1B2006534, NRF-2018M3D1A1059001]
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Multifunctional temperaturestrain 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.
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