Chinese options letters 2020 issue 3 cover article:
Haoyan Jiang, Yaoyi Tang, Xiaohan Zeng, Ruiwen Xiao, Peng Lü, Lei Wang, Yanqing Lu. Visual measurement of the microscopic temperature of porous graphene based on cholesteric liquid crystal microcapsules[J]. Chinese Optics Letters, 2020, 18(3): 031201
In recent years, great attention has been paid to the study of graphene properties. Among them, three-dimensional porous graphene not only inherits the advantages of high conductivity, high thermal conductivity and strong chemical stability of two-dimensional graphene, but also has high specific surface area, high porosity and excellent elasticity due to its structural characteristics, which is widely used in the fields of flexible electronics, thermal energy management and catalytic loading. Facing the requirements of miniaturization, integration and performance improvement, the measurement of micro temperature is a basic and urgent problem. Traditional temperature detectors, such as thermocouple type, thermal resistance type, infrared thermometer and so on, have shortcomings in measurement accuracy. However, the new micro temperature measurement system based on carbon nanotubes, atomic force microscopy, temperature sensing fiber and magnetic nanoparticles is generally expensive, complex in structure and limited in practical application. There are still many challenges to accurately measure the micro temperature of graphene. Recently, researchers from Nanjing University of Posts and telecommunications and Nanjing University proposed a simple and visual method to measure the micro temperature of 3D porous graphene. The relevant research results were published in the third issue of Chinese options letters in 2020 and selected as the cover article by the editor in chief.
Based on the color change of one microcapsule, the temperature in the 20 μ m region can be obtained with an accuracy of 0.1 ° C. by analyzing two microcapsules, the temperature of about 110 μ M can be obtained The dynamic change of temperature in the range of μ m, and the color evolution of the three liquid crystal microcapsules were compared, and the thermal properties of the three-dimensional porous graphene were obtained.
Based on clcms, the visualization system of micro temperature measurement of porous graphene is developed. Illustration: distribution of clcms on porous graphene.
"Cholesteric liquid crystal capsule, as a micro thermal detector, can detect the reflected wavelength without contact," said Wang Lei, associate professor of the research team. Through the change of color, the perceived temperature can be quantified. It can not only measure the micro temperature distribution of the object in the heat balance, but also detect the thermal dynamic process in real time. At the same time, the three-dimensional porous graphene itself will appear black due to the absorption of visible light, which is very conducive to the image measurement of various colors of light reflected by the liquid crystal capsule. "
The current work verified the feasibility of 3D porous graphene micro region temperature visualization measurement based on cholesteric liquid crystal capsule. In the future, we will further optimize the temperature sensitivity and temperature sensing range of the liquid crystal capsule, customize the measurement of the local thermal characteristics of graphene, and study the temperature characteristics of various graphene based devices, so as to optimize the design and realize the efficient thermal management of graphene devices and the overall performance of the elevator. This method can also be used to measure the micro temperature of other two-dimensional and three-dimensional materials and devices.
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