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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Bioinspired, direct synthesis of aqueous CdSe quantum dots for high-sensitive copper(ii) ion detection
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Bioinspired, direct synthesis of aqueous CdSe quantum dots for high-sensitive copper(ii) ion detection

机译：生物启发的CdSe量子点水溶液的直接合成，用于高灵敏的铜（ii）离子检测

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摘要

Luminescent CdSe semiconductor quantum dots (QDs), which are coated with a denatured bovine serum albumin (dBSA) shell, have been directly synthesized via a bioinspired approach. The dBSA coated CdSe QDs are ultrasmall (d < 2.0 nm) with a narrow size distribution and exhibit a strong green fluorescent emission at about 525 nm. They can be stored for months at room temperature and possess excellent stability against ultraviolet irradiation, high salt concentration, and a wide physiological range of pH. Systematic experimental investigations have shown the contribution of dBSA with free cysteine residues for both their effective ion chelating and surface passivating interactions during the formation and stabilization of CdSe QDs. The luminescent QDs are used for copper(ii) ion detection due to their highly sensitive and selective fluorescence quenching response to Cu~(2+). The concentration dependence of the quenching effect can be best described by the typical Stern-Volmer equation in a linearly proportional concentration of Cu~(2+) ranging from 10 nM to 7.5 μM with a detection limit of 5 nM. As confirmed by various characterization results, a possible quenching mechanism is given: Cu ~(2+) ions are first reduced to Cu~+ by the dBSA shell and then chemical displacement between Cu~+ and Cd~(2+) is performed at the surface of the ultrasmall metallic core to impact the fluorescence performance.
机译：发光的CdSe半导体量子点（QD）涂有变性的牛血清白蛋白（dBSA）外壳，已通过生物启发方法直接合成。经dBSA涂覆的CdSe QD具有极小的尺寸（d <2.0 nm），尺寸分布窄，在约525 nm处显示出很强的绿色荧光发射。它们可以在室温下保存数月，并具有出色的抗紫外线照射稳定性，高盐浓度和广泛的pH值生理范围。系统的实验研究表明，在游离CdSe量子点的形成和稳定过程中，具有游离半胱氨酸残基的dBSA对其有效的离子螯合和表面钝化相互作用都有贡献。发光量子点因其对Cu〜（2+）的高度敏感和选择性的荧光猝灭响应而用于铜离子的检测。淬灭效果的浓度依赖性可以通过典型的Stern-Volmer方程以Cu〜（2+）的线性比例浓度在10 nM至7.5μM的范围内以5 nM的检测极限来最好地描述。正如各种表征结果所证实的，给出了一种可能的猝灭机理：Cu〜（2+）离子首先被dBSA壳还原为Cu〜+，然后在60℃进行Cu〜+与Cd〜（2+）之间的化学置换。超小金属核的表面会影响荧光性能。

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