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Roles of glutathione and L-cysteine in the biomimetic green synthesis of CdSe quantum dots |
Ling-Li Li, Yin-Hua Cui, Jie-Jie Chen, Han-Qing Yu() |
CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei 230026, China |
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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.
![]() 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
Quantum dots (QDs)
Biomimetic synthesis
Bio-thiols
Glutathione (GSH)
Cysteine (Cys)
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Corresponding Author(s):
Han-Qing Yu
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Issue Date: 11 May 2017
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