Carbon dots fluoresce their way through the rainbow as liquids change
Fluorescent materials usually emit a single consistent color. They are typically made from dyes or metallic components. In contrast, researchers reporting in ACS Central Science have created carbon dots that can fluoresce in a range of colors under UV light, depending on the concentration and the liquid they're in. The team incorporated the new carbon dots into plastic decorations and used them…
Carbon dots, fluorescent particles that change color based on their environment, have been developed by researchers reporting in ACS Central Science. Unlike traditional fluorescent materials that emit a single color, these carbon dots can fluoresce in a spectrum of colors ranging from blue to red, depending on factors such as pH, solvent, and concentration.
The researchers, led by Siyu Lu and Lin Ai, created two types of carbon dots, CD1 and CD2, by heating carbon-based compounds in an organic solvent under pressure. CD1 fluoresced red in acidic water and green in alkaline water, while CD2 changed color in response to different liquids and concentrations. By mixing the carbon dot solutions with polymers, the researchers produced blue, green, yellow, and red materials that could be used in various applications, including data encryption and anticounterfeiting technologies.
The carbon dots' ability to change color in response to their surroundings offers a new approach to designing smart optical materials that can sense their environment and convey information. The researchers are actively exploring opportunities to commercialize the carbon dots, particularly for information encryption purposes. Further studies will focus on assessing long-term stability, large-scale manufacturing, and production cost.
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