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One-pot synthesis of hydrophilic and hydrophobic fluorescent carbon dots using deep eutectic solvents as designer reaction media

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Abstract

Carbon dots are often synthesized in the presence of a carbon source and passivating agents in which they are crucial for an enhanced fluorescence. The solvent choice and/or combination to be used in the synthesis of these nanoparticles can influence their surface chemical composition, morphology, and fluorescence properties. In this study, highly fluorescent carbon dots were synthesized using deep eutectic solvents of different compositions as green solvent media and doping agent. Resulting carbon dots were then separated by their hydrophilicity/hydrophobicity using a three-phase solvent system (water/acetone/chloroform) and compared with traditional centrifugation-based separation method. Carbon dots with a size below 20 nm and quantum yield reaching 50% were obtained. Many properties of them including surface functional groups, optical, fluorescence, and electric properties were shown to be determined by the deep eutectic solvent composition.

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Acknowledgements

This study was funded by the Mersin University Scientific Research Project Unit with the Project No 2017-1-AP3-2220. MOA thanks the doctoral scholarship of TUBITAK Project Nos: 117M215 and 100/2000 Doctoral scholarship of Higher Education Institution of Turkey. Authors thank the Academic Writing Unit of Technology Transfer Office of Mersin University for final proofreading.

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Correspondence to Selda Doğan Çalhan or Rükan Genç.

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Çalhan, S.D., Alaş, M.Ö., Aşık, M. et al. One-pot synthesis of hydrophilic and hydrophobic fluorescent carbon dots using deep eutectic solvents as designer reaction media. J Mater Sci 53, 15362–15375 (2018) doi:10.1007/s10853-018-2723-4

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