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首页> 外文期刊>RSC Advances >One pot selective synthesis of water and organic soluble carbon dots with green fluorescence emission
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One pot selective synthesis of water and organic soluble carbon dots with green fluorescence emission

机译：一锅选择性合成水和有机可溶性碳点并发出绿色荧光

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摘要

In this work, two types of carbon dots (CDs), water soluble carbon dots (WCDs) and organic soluble carbon dots (OCDs), have been selectively synthesised via a simple, energy-saving process at room temperature. By using cetylpyridinium chloride monohydrate (CPC) as the carbon source, CDs with strong green fluorescence emission could be obtained only in the presence of NaOH, without the need for external heating or additional energy input such as microwave or ultrasound. By controlling the reaction conditions of concentration of NaOH and reaction time, WCDs and OCDs were synthesised and this is the first time for the controllable synthesis of WCDs and OCDs at ambient conditions. The as-prepared WCDs and OCDs were characterised by UV-vis absorption, photoluminescence (PL) spectroscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, and PL lifetime. The results show that both WCDs and OCDs have uniform particle distribution, better photostability and strong luminescence with a quantum yield of 7.2 and 16.7% for WCDs and OCDs, respectively. The formation mechanisms of WCDs and OCDs were postulated by detailed examining of the reaction process and characterisation of the WCDs and OCDs. Owing to the favourable properties of strong emission, good photostability and low toxicity, the WCDs have been successfully applied for bioimaging. This new bottom-up synthetic strategy results in harvesting high-quality CDs, exhibiting the potential of easy and inexpensive large-scale production of WCDs and OCDs.
机译：在这项工作中，通过简单，节能的室温工艺选择性地合成了两种碳点（CD），即水溶性碳点（WCD）和有机可溶性碳点（OCD）。通过使用十六烷基氯化吡啶鎓一水合物（CPC）作为碳源，只有在存在NaOH的情况下，才能获得具有强绿色荧光发射的CD，而无需外部加热或微波或超声波之类的额外能量输入。通过控制NaOH浓度和反应时间的反应条件，合成了WCD和OCD，这是在环境条件下可控合成WCD和OCD的首次。所制备的WCD和OCD的特征在于紫外可见吸收，光致发光（PL）光谱，透射电子显微镜，X射线光电子能谱，傅里叶变换红外光谱和PL寿命。结果表明，WCD和OCD均具有均匀的颗粒分布，更好的光稳定性和强发光性，WCD和OCD的量子产率分别为7.2和16.7％。通过详细检查反应过程以及对WCD和OCD的表征来推测WCD和OCD的形成机理。由于具有强发射，良好的光稳定性和低毒性的良好特性，WCD已成功应用于生物成像。这种新的自下而上的合成策略导致收获了高质量的CD，展现出了容易而廉价地大规模生产WCD和OCD的潜力。

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