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Abstract
CdSe QDs were synthesized with CdCl2, Na2SeO3 and bio-thiols under mild conditions.
Compared with L-cysteine, glutathione was superior for CdSe QDs formation.
Cd2+ binding capacity of glutathione contributed to the CdSe QDs formation.
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Biological synthesis of quantum dots (QDs) as an environmental-friendly and facile preparation method has attracted increasing interests. However, it is difficult to distinguish the roles of bio-thiols in QDs synthesis process because of the complex nature in organisms. In this work, the CdSe QDs synthesis conditions in organisms were reconstructed by using a simplified in vitro approach to uncover the roles of two small bio-thiols in the QDs formation. CdSe QDs were synthesized with glutathione (GSH) and L-cysteine (Cys) respectively. Compared with Cys at the same molar concentration, the CdSe QDs synthesized by GSH had a larger and broader particle size distribution with improved optical properties and crystal structure. Furthermore, quantum chemical calculations indicate that the stronger Cd2+ binding capacity of GSH contributed a lot to the CdSe QDs formation despite of the greater capability Cys for selenite reduction. This work clearly demonstrates the different roles of small thiols in the Cd2+ stabilization in the environment and biomimetic QDs synthesis process.
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Keywords
CdSe
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Quantum dots (QDs)
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Biomimetic synthesis
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Bio-thiols
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Glutathione (GSH)
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Cysteine (Cys)
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Ling-Li Li, Yin-Hua Cui, Jie-Jie Chen, Han-Qing Yu.
Roles of glutathione and L-cysteine in the biomimetic green synthesis of CdSe quantum dots.
Front. Environ. Sci. Eng., 2017, 11(6): 7 DOI:10.1007/s11783-017-0948-0
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