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http://dx.doi.org/10.46670/JSST.2021.30.4.218

Designing a nanocrystal-based temperature and strain multi-sensor with one-step inkjet printing  

Bang, Junsung (Department of Materials Science and Engineering, Korea University)
Ahn, Junhyuk (Department of Materials Science and Engineering, Korea University)
Oh, Soong Ju (Department of Materials Science and Engineering, Korea University)
Publication Information
Journal of Sensor Science and Technology / v.30, no.4, 2021 , pp. 218-222 More about this Journal
Abstract
Wearable multi-sensors based on nanocrystals have attracted significant attention, and studies on patterning technology to implement such multi-sensors are underway. Conventional patterning processes may affect material properties based on high temperatures and harsh chemical conditions. In this study, we developed an inkjet printing technique that can overcome these drawbacks through the application of patterning processes at room temperature and atmospheric pressure. Nanocrystal-based ink is used to adjust properties efficiently. Additionally, the viscosity and surface tension of the solvents are investigated and optimized to increase patterning performance. In the patterning process, the electrical, electrothermal, and electromechanical properties of the nanocrystal pattern are controlled by the ligand exchange process. Experimental results demonstrate that a multi-sensor with a temperature coefficient of resistance of 3.82 × 10-3 K-1 and gauge factor of 30.6 can be successfully fabricated using one-step inkjet printing.
Keywords
Nanocrystal; Inkjet printing; One-step; Surface chemistry; Ligand exchange; Multi-sensor;
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