Materials 2017, 10(5), 476; doi:10.3390/ma10050476
Synthesis and Thermochromic Properties of Cr-Doped Al2O3 for a Reversible Thermochromic Sensor
1
Department of Civil Engineering, Pusan National University (PNU), 30 Jangjeon-dong, Geumjeong-gu, Busan 46241, Korea
2
Department of Materials Science and Engineering, Pusan National University (PNU), 30 Jangjeon-dong, Geumjeong-gu, Busan 46241, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Wolfgang Linert
Received: 15 March 2017 / Revised: 19 April 2017 / Accepted: 26 April 2017 / Published: 28 April 2017
Abstract
An inorganic thermochromic material based on Cr-doped Al2O3 is synthesized using a solid-state method. The crystal structure, chemical composition, and morphology of the synthesized material are analyzed using X-ray diffraction, scanning electron microscopy coupled with an energy-dispersive X-ray spectrometer, and Fourier transform infrared (FT-IR) spectroscopy. The color performances of the synthesized material are analyzed using a UV-VIS spectrometer. Finally, the thermochromism exhibited by the powdered samples at high temperatures is investigated. The material exhibits exceptional thermochromic property, transitioning from pink to gray or green in a temperature range of 25–600 °C. The change in color is reversible and is dependent on the surrounding temperature and chromium concentration; however, it is independent of the exposure time. This novel property of Cr-doped Al2O3 can be potentially employed in reversible thermochromic sensors that could be used not only for warning users of damage due to overheating when the environmental temperature exceeds certain limits, but also for detecting and monitoring the temperature of various devices, such as aeronautical engine components, hotplates, and furnaces. View Full-TextKeywords:
reversible thermochromic sensors; Cr-doped alumina; thermochromic materials; thermochromism
▼
Figures
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
Share & Cite This Article
MDPI and ACS Style
Nguyen, D.K.; Lee, H.; Kim, I.-T. Synthesis and Thermochromic Properties of Cr-Doped Al2O3 for a Reversible Thermochromic Sensor. Materials 2017, 10, 476.
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.
Related Articles
Article Metrics
Comments
[Return to top]
Materials
EISSN 1996-1944
Published by MDPI AG, Basel, Switzerland
RSS
E-Mail Table of Contents Alert