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Preparation of blue luminescence gold quantum dots using laser ablation in aromatic solvents

Abstract

Gold quantum dots (GQDs) have significant applications in the biomedical field, solar cells and light-emitting diodes. Synthesis of three various types of blue fluorescent GQDs are carried out for the first time by Nd: YAG laser ablation of Au target in aromatic solvent. The laser fluence used in this experiment was 0.2 J/cm2. The characteristics of the as-prepared GQDs are confirmed by UV−vis, transmittance electron microscopy, X-ray diffraction, photoelectron spectroscopy and photoluminescence (PL). Pure and ligand-free gold quantum dots as a new type of fluorescent material are prepared through a one-step novel method. The results suggest that the molecule-like structure of GQDs is proven by the optical band energy gap (Eg = 2.54 eV), PL (λem = 427 nm, 1.76% quantum yield) and quantum confinement of an ultra-tiny size (~ 1 nm). GQDs particles size of about 1 nm obtained by laser ablation in aromatic medium are reported for the first time. The blue luminescent and high purity of GQDs can be used efficiently for important applications, such as biosensor, bioimaging and bio-diagnosis.

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Acknowledgements

This work was supported by (TUBITAK)/Department of Science Fellowships and Grant Programs (BIDEB)/2221 and by Ege University-solar Energy Institute. Further, it was supported by the University of Technology/ ministry of higher education and scientific research, Baghdad-Iraq. Thanks to Ege University/ Library and Documentation Center for English proof reading.

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Ali, A.K., Erten-Ela, S., Ismail, R.A. et al. Preparation of blue luminescence gold quantum dots using laser ablation in aromatic solvents. Appl Nanosci 11, 2779–2791 (2021). https://doi.org/10.1007/s13204-021-02171-1

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