Photobleaching and stabilization of carbon nanodots produced by solvothermal synthesis.
Photobleaching and stabilization of carbon nanodots produced by solvothermal synthesis.
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DOI：
10.1039/c5cp04942c
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发表时间：
2016-01
期刊：
影响因子：
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通讯作者：
Wenshuo Wang;C. Damm;J. Walter;Thomas J. Nacken;W. Peukert
中科院分区：
文献类型：
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作者：
Wenshuo Wang;C. Damm;J. Walter;Thomas J. Nacken;W. Peukert
在这项工作中，我们进行了详细的调查的自下而上生产的碳纳米点（CD）制备柠檬酸和尿素的溶剂热合成的光稳定性。分析性超离心（AUC）揭示了CD具有<lnm的流体动力学直径和非常窄的尺寸分布。在社区中，人们普遍认为CD是光稳定的。相反，我们发现，暴露于紫外线照射的CD表现出显着的荧光变性相比，新鲜制备的CD或储存在黑暗中的CD，这表明荧光漂白是由光化学过程引起的。我们发现，由于暴露于紫外线照射的荧光强度衰减加速在氧气的存在下，并确定了CD的表面状态的CD的荧光漂白的决定性因素。基于对潜在机制的讨论，我们展示了如何避免CD的光漂白。
In this work we performed a detailed investigation of the photostability of bottom-up produced carbon nanodots (CDs) prepared from citric acid and urea by solvothermal synthesis. Analytical ultracentrifugation (AUC) reveals that the CDs have a hydrodynamic diameter of <1 nm and a very narrow size distribution. In the community it is widely assumed that CDs are photo-stable. In contrast, we found that CDs exposed to UV-irradiation exhibit noteworthy fluorescence degeneration compared to freshly prepared CDs or CDs stored in the dark, indicating that fluorescence bleaching is caused by a photochemical process. We found that fluorescence intensity decay due to exposure to UV-irradiation is accelerated in the presence of oxygen and identified the surface status of CDs as the decisive factor of fluorescence bleaching of CDs. Based on a discussion on the underlying mechanisms we show how to avoid photobleaching of CDs.