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In this study, by adjusting sulfuric acid concentrations, tunable multicolour S/N‐carbon quantum dots (CQDs) were synthesized from waste foam as the raw material. The S/N‐CQDs presented blue, blue–green, green, green–yellow and yellow emission with an emission peak shifting from 475 to 589 nm and with optimum excitation wavelengths of 385, 405, 440, 450, and 500 nm, respectively. Using transmission...
In this paper, two types of carbon quantum dot (CQDs) were prepared using biocompatible l‐methionine as the carbon source and urea as the nitrogen source and a one‐step hydrothermal treatment. By changing the reaction solvents (deionized (DI) water and dimethylformamide (DMF)), the maximum emission of the resulting CQDs shifted from blue to red light. Specifically, the emission wavelength of the CQDs...
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