A simple strategy to enhance the sensitivity of fluorescent sensor-based CdS quantum dots by using a surfactant for Hg2+ detection,Analytical Methods

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A simple strategy to enhance the sensitivity of fluorescent sensor-based CdS quantum dots by using a surfactant for Hg2+ detection
Analytical Methods ( IF 2.7 ) Pub Date : 2021-07-28 , DOI: 10.1039/d1ay01047f
Pradthana Sianglam ₁ , Kessarin Ngamdee _{1,

2} , Phattananawee Nalaoh ₃ , Vinich Promarak ₃ , Andrew J Hunt ₁ , Wittaya Ngeontae _{1,

2,

4}

Affiliation

A simple strategy to enhance the detection sensitivity of fluorescent sensor-based CdS quantum dots (CdS QDs) for the detection of mercury ions (Hg²⁺) was demonstrated. L-Cysteine-capped CdS QDs (L-Cyst-CdS QDs) were synthesized and utilized as a probe for selective detection of Hg²⁺. The fluorescence intensity of the L-Cyst-CdS QDs was quenched in the presence of Hg²⁺. However, the detection sensitivity was unsatisfactory. Upon the addition of sodium dodecyl sulfate (SDS), the fluorescence intensity of L-Cyst-CdS QDs can be effectively enhanced. On the other hand, the fluorescence intensity of the L-Cyst-CdS QDs in the presence of SDS (SDS@L-Cyst-CdS QDs) was able to be dramatically decreased with the addition of Hg²⁺. Furthermore, the proposed sensor displayed excellent selectivity towards Hg²⁺ compared to other cations. Under optimized conditions, the proposed sensor could be applied to detect trace amounts of Hg²⁺ with a limit of detection of approximately 36 nM. The applicability of this sensor was demonstrated by the determination of Hg²⁺ in real water samples, and the results agreed with those obtained from cold vapor atomic absorption spectrometry (CVAAS).

中文翻译：

通过使用表面活性剂检测 Hg2+ 来提高基于荧光传感器的 CdS 量子点灵敏度的简单策略

展示了一种提高基于荧光传感器的 CdS 量子点 (CdS QD) 检测汞离子 (Hg ²⁺ )的检测灵敏度的简单策略。合成了L -半胱氨酸封端的 CdS QD（L -Cyst-CdS QD）并用作探针来选择性检测 Hg ²⁺。L -Cyst-CdS QD的荧光强度在 Hg ²⁺存在下被淬灭。然而，检测灵敏度并不令人满意。加入十二烷基硫酸钠 (SDS) 后，L -Cyst-CdS 量子点的荧光强度可以有效增强。另一方面，L的荧光强度-Cyst-CdS 量子点在 SDS 的存在下（SDS@ L -Cyst-CdS 量子点）能够随着 Hg ²⁺的添加而显着减少。此外，与其他阳离子相比，所提出的传感器对 Hg ²⁺表现出出色的选择性。在优化条件下，所提出的传感器可用于检测痕量 Hg ²⁺，检测限约为 36 nM。通过测定实际水样中的 Hg ²⁺证明了该传感器的适用性，其结果与冷蒸气原子吸收光谱法 (CVAAS) 获得的结果一致。

更新日期：2021-08-24

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