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Jeong, Hoon Eui
Multiscale Biomimetics & Manufacturing Lab
Research Interests
  • Biomimetics
  • Multiscale manufacturing
  • Micro/nanofabrication

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Colorimetric Sensor Based on Hydroxypropyl Cellulose for Wide Temperature Sensing Range

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Title
Colorimetric Sensor Based on Hydroxypropyl Cellulose for Wide Temperature Sensing Range
Author
Yi, HoonLee, Sang-HyeonKim, DanaJeong, Hoon EuiJeong, Changyoon
Issue Date
2022-02
Publisher
MDPI
Citation
SENSORS, v.22, no.3, pp.886
Abstract
Recently, temperature monitoring with practical colorimetric sensors has been highlighted because they can directly visualize the temperature of surfaces without any power sources or electrical transducing systems. Accordingly, several colorimetric sensors that convert the temperature change into visible color alteration through various physical and chemical mechanisms have been proposed. However, the colorimetric temperature sensors that can be used at subzero temperatures and detect a wide range of temperatures have not been sufficiently explored. Here, we present a colorimetric sensory system that can detect and visualize a wide range of temperatures, even at a temperature below 0 degrees C. This system was developed with easily affordable materials via a simple fabrication method. The sensory system is mainly fabricated using hydroxypropyl cellulose (HPC) and ethylene glycol as the coolant. In this system, HPC can self-assemble into a temperature-responsive cholesteric liquid crystalline mesophase, and ethylene glycol can prevent the mesophase from freezing at low temperatures. The colorimetric sensory system can quantitatively visualize the temperature and show repeatability in the temperature change from -20 to 25 degrees C. This simple and reliable sensory system has great potential as a temperature-monitoring system for structures exposed to real environments.
URI
https://scholarworks.unist.ac.kr/handle/201301/57372
URL
https://www.mdpi.com/1424-8220/22/3/886
DOI
10.3390/s22030886
ISSN
1424-8220
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