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首页> 外文期刊>RSC Advances >One-pot synthesis of photoluminescent carbon nanodots by carbonization of cyclodextrin and their application in Ag+ detection
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One-pot synthesis of photoluminescent carbon nanodots by carbonization of cyclodextrin and their application in Ag+ detection

机译：环糊精碳化一锅法合成光致发光碳纳米点及其在银离子检测中的应用

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摘要

A simple one-pot approach is developed for the preparation of carbon nanodots (C-dots) by low temperature hydrothermal carbonization of cyclodextrin in a hydrochloric acid aqueous solution. The cyclodextrin-based C-dots have a narrow size distribution and show a high fluorescence quantum yield. The C-dots possess excitation-independent downconversion and upconversion photoluminescent (PL) properties, and have a strong green luminescent emission with a maximal peak at 510 nm when they are excited at 420 nm. Besides, the PL properties of the C-dots have a non-obvious change in a wide range of pH values of 5-11. The fluorescence lifetime of the C-dots is about 2.5 ns. Moreover, the obtained C-dots are able to reduce Ag+ ions to elemental silver (Ag-0) on their surface under sunlight, leading the PL intensity to be linearly changed with the Ag+ concentration, which can serve as an effective fluorescent probe for the detection of Ag+ in an aqueous solution.
机译：开发了一种简单的一锅法，用于通过在盐酸水溶液中对环糊精进行低温水热碳化来制备碳纳米点（C点）。基于环糊精的C-点具有窄的尺寸分布并且显示出高的荧光量子产率。 C点具有与激发无关的下转换和上转换光致发光（PL）特性，并且具有很强的绿色发光发射，当它们在420 nm处激发时具有最大峰值在510 nm。此外，C点的PL特性在5-11的宽pH值范围内都没有明显变化。 C点的荧光寿命约为2.5 ns。此外，获得的碳点能够在阳光下将其表面上的Ag +离子还原为元素银（Ag-0），从而导致PL强度随Ag +浓度线性变化，从而可以作为有效的荧光探针。检测水溶液中的Ag +。

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