Next Article in Journal
Understanding the Stress Relaxation Behavior of Polymers Reinforced with Short Elastic Fibers
Previous Article in Journal
Effect of Partial Crystallization on the Structural and Luminescence Properties of Er3+-Doped Phosphate Glasses
Open AccessArticle

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
Materials 2017, 10(5), 476; https://doi.org/10.3390/ma10050476
Received: 15 March 2017 / Revised: 19 April 2017 / Accepted: 26 April 2017 / Published: 28 April 2017
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-Text
Keywords: reversible thermochromic sensors; Cr-doped alumina; thermochromic materials; thermochromism reversible thermochromic sensors; Cr-doped alumina; thermochromic materials; thermochromism
Show Figures

Graphical abstract

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.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop