Synthesis of multicolor fluorescent CDs from natural plant kaempferide and their application in anti-counterfeiting inks

IF 5.5 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY Carbon Letters Pub Date : 2023-10-02 DOI:10.1007/s42823-023-00618-9

Linping Ma, Xiang Long, Yanshun Ma, Shaogui Wu

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Abstract

Carbon dots (CDs) are versatile nanomaterials with tunable luminescent properties. We used a natural plant kaempferol as a carbon source to synthesize multicolor CDs by reacting it with various nitrogen sources. Blue, green, and red CDs (B-CDs, G-CDs, and R-CDs) with emission wavelengths of 445 nm, 510 nm, and 600 nm respectively were successfully synthesized. Their photoluminescence quantum yields of are up to 37.4%, 20.1%, and 30.8%, respectively. Surface analysis revealed abundant nitrogen groups influencing luminescence. B-CDs and G-CDs show excitation-dependent emissions, indicating a potential correlation between their luminescence and particle sizes, while R-CDs exhibit excitation-independent emission, suggesting they belong to molecular state CDs. All three CDs exhibit stable luminescent performance, as well as good salt resistance and photobleaching resistance. The practical application of multicolored CDs in anti-counterfeiting fluorescent inks was further explored. This work offers a straightforward, eco-friendly route to synthesize multicolor CDs.

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从天然植物山奈苷中合成多色荧光 CD 及其在防伪油墨中的应用

碳点（CD）是一种具有可调发光特性的多功能纳米材料。我们以天然植物山奈酚为碳源，通过与各种氮源反应合成了多色碳点。我们成功合成了发射波长分别为 445 nm、510 nm 和 600 nm 的蓝色、绿色和红色 CD（B-CD、G-CD 和 R-CD）。它们的光致发光量子产率分别高达 37.4%、20.1% 和 30.8%。表面分析表明，丰富的氮基对发光有影响。B-CDs 和 G-CDs 显示出与激发相关的发射，表明它们的发光与颗粒大小之间存在潜在的相关性，而 R-CDs 则显示出与激发无关的发射，表明它们属于分子态 CD。这三种光盘都具有稳定的发光性能，以及良好的耐盐性和耐光漂白性。研究还进一步探讨了多色 CD 在防伪荧光油墨中的实际应用。这项工作为合成多色光盘提供了一条直接、环保的途径。

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来源期刊

Carbon Letters CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

7.30

自引率

20.00%

发文量

118

期刊介绍： Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.