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Nitrogen enriched carbon dots (CDs) are prepared by hydrothermal treatment with oxalic acid and ethylenediamine serving as raw materials. The obtained CDs display strong blue fluorescence emission at λex/λem = 320/410 nm, along with a quantum yield of 14%. It is interesting to obtain a linear increase of fluorescence with the variation of pH value within pH 5.01–8.94. Meanwhile, a favorable stability...
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