Toward Uniform Optical Properties of Carbon Dots,Particle & Particle Systems Characterization

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Toward Uniform Optical Properties of Carbon Dots
Particle & Particle Systems Characterization ( IF 2.7 ) Pub Date : 2020-07-14 , DOI: 10.1002/ppsc.202000119
Farah Noun _{1,

2} , John Manioudakis _{1,

2} , Rafik Naccache _{1,

2}

Affiliation

Carbon dots possess versatile optical properties that have prompted their investigation in applications including photocatalysis, photovoltaics, imaging, and drug delivery, among others. However, the preparation of these nanodots is accompanied by the formation of fluorophores and intermediates, which can be difficult to separate. In the absence of thorough purification protocols, the reported optical properties are often heterogeneous, which hinders understanding of their physicochemical and optical properties and concrete application development. Here, two hydrophilic carbon dot systems starting with citric acid and diethylenetriamine are prepared. The impact of purification, including dialysis, ultrafiltration, and organic washes, on the properties of the dots is demonstrated. It is shown that monitoring the purification endpoint using near‐infrared, fluorescence, and absorbance spectroscopies is possible. Moreover, it is demonstrated that fluorescence quantum yields can be a reliable tool to determine the purification endpoint. This work shows that even carbon dots derived from the same chemical precursors can have different purification profiles and purification requirements. However, the developed approach can be used to determine the proper purification procedure and endpoint for any carbon dot system regardless of the starting materials. Finally, it is envisioned that this work can be easily extended toward the purification of other hydrophilic nanomaterials.

中文翻译：

碳点的均匀光学特性

碳点具有多种光学特性，促使其在光催化，光电，成像和药物输送等应用中进行研究。然而，这些纳米点的制备伴随着荧光团和中间体的形成，这可能很难分离。在缺乏彻底的纯化方案的情况下，所报道的光学性质通常是异质的，这妨碍了对其理化和光学性质以及具体应用开发的理解。在此，制备了以柠檬酸和二亚乙基三胺为起始的两个亲水性碳点体系。展示了包括透析，超滤和有机洗涤在内的纯化对点的性质的影响。结果表明，可以使用近红外，荧光和吸收光谱法监测纯化终点。此外，已证明荧光量子产率可以是确定纯化终点的可靠工具。这项工作表明，即使是衍生自相同化学前体的碳点也可能具有不同的纯化特性和纯化要求。但是，无论起始原料是什么，开发的方法都可用于确定任何碳点系统的正确纯化程序和终点。最后，可以预见，这项工作可以很容易地扩展到其他亲水性纳米材料的纯化。结果表明，荧光量子产率可以作为确定纯化终点的可靠工具。这项工作表明，即使是衍生自相同化学前体的碳点也可能具有不同的纯化特性和纯化要求。但是，无论起始原料是什么，开发的方法都可用于确定任何碳点系统的正确纯化程序和终点。最后，可以预见，这项工作可以很容易地扩展到其他亲水性纳米材料的纯化。结果表明，荧光量子产率可以作为确定纯化终点的可靠工具。这项工作表明，即使是衍生自相同化学前体的碳点也可能具有不同的纯化特性和纯化要求。但是，无论起始原料是什么，开发的方法都可用于确定任何碳点系统的正确纯化程序和终点。最后，可以预见，这项工作可以很容易地扩展到其他亲水性纳米材料的纯化。不管起始原料是什么，开发的方法都可以用来确定任何碳点系统的正确纯化程序和终点。最后，可以预见，这项工作可以很容易地扩展到其他亲水性纳米材料的纯化。不管起始原料是什么，开发的方法都可以用来确定任何碳点系统的正确纯化程序和终点。最后，可以预见，这项工作可以很容易地扩展到其他亲水性纳米材料的纯化。

更新日期：2020-07-14

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