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In a perfect match between theory and experiment, scientists predict that a single laser beam can be used to measure and control the temperature of large graphene bubbles.
team of researchers at the Center for Multi-dimensional Carbon Materials at the Institute of Basic Sciences (IBS) measured and controlled the temperature of graphene bubbles for the first time using a single laser beam. The latest study is published in Physical Review Express.
Graphene's high elasticity and flexibility have brought many new discoveries in the field of two-dimensional materials, but researchers have shifted their minds to the idea that it more or less produces stable graphene atmosphere bubbles in a controlled manner. Strain and curvature introduced by bubbles are known to be able to tune the electronic, chemical, and mechanical properties of the material. In general, graphene bubbles are more reactive than tiled graphene, so they are more easily modified by chemical groups. Bubbles can be used as tiny closed reactors, and their surfaces provide lens effects. Now, understanding how temperature changes within bubbles is an important factor in your application."If you think that a chemical reaction can be done inside a bubble or on the surface of each graphene bubble, changing the temperature distribution in the bubble will significantly affect the reaction that occurs," said Yuan Huang, lead author of the study.study, bubbles formed on the interface between graphene sheets and silicon dioxide (SiO2/Si) substates. Some molecules adsorbed on the surface of SiO2 are evaporated when heated, creating bubbles.
, as predicted by the Xiao Wang and Feng Ding team theory, the temperature oscillates with the height of the bubble. Although each bubble is only a few microns wide and only about a micron high, scientists can still detect changes in bubble temperature, not only between the center and edge, but also at different heights of the bubble.when graphene bubbles are irradiated by a laser beam, the incoming and reflected light overlaps, forming an optical stop wave on the bubble surface. Increasing the laser power has the effect of selectively heating a specific area of the bubble, which corresponds to the maximum interference at the station. IBS scientists use Raman spectroscopy to detect local temperature changes in each bubble, a standard technique for measuring graphene properties and morphology." stationary wave has been neglected for a long time because it is rarely directly observed. The results of the experiment are surprising, the laser beam can effectively heat graphene, we can determine the thermal conductivity of graphene bubbles from the temperature distribution of graphene bubbles," explained wolfgang Bacsa, one of the team members, and a visiting scientist from the University of Toulouse in France." results confirm the high thermal conductivity of previously measured graphite, demonstrate excellent adhesion around graphene bubbles, and provide a new perspective on how to heat graphene bubbles at specific locations. Co-author Rod Ruoff, director of the Multi-dimensional Carbon Materials Center, said. The more we learn about the physical properties of graphene bubbles, the more we can use them in different ways.For example, for graphene bubbles, an interesting application might be to create graphene sheets with round holes, like the "polka dot" pattern (polka dots are generally dots of the same size and color arranged evenly at a certain distance). Because bubbles break due to overheating, holes with specific chemical groups can act as molecular selective filters. Graphene's unique properties never stop on the road to new discoveries.
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