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首页> 外文期刊>RSC Advances >Dithizone-etched CdTe nanoparticles-based fluorescence sensor for the off–on detection of cadmium ion in aqueous media
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Dithizone-etched CdTe nanoparticles-based fluorescence sensor for the off–on detection of cadmium ion in aqueous media

机译：基于双硫i蚀刻的基于CdTe纳米颗粒的荧光传感器，用于在水介质中关闭检测镉离子

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In the present study, a new fluorescence probe based on dithizone-etched CdTe nanoparticles was designed for the sensitive and selective detection of cadmium ions in environmental samples via a reversible off–on fluorescence mode. At first, the initial bright fluorescence of L-cysteine-capped CdTe NPs could be effectively quenched in the presence of dithizone (DZ) due to the chemical etching effect, which results from the breaking of Cd–thiol layers by DZ, thus leading to a decrease in the NPs surface passivation. Then, upon the addition of Cd2+, the weak fluorescence of the CdTe NPs–DZ system gradually recovered, owing to the occurrence of Cd–thiol passivation layers on the surface of the NPs. Under optimal conditions, a good linear relationship was obtained in the range from 0.4 μM to 15.4 μM for Cd2+, with a detection limit of 0.13 μM. In addition, this CdTe NPs-based nanosensor presents remarkable selectivity for Cd2+ over other metal ions and was successfully applied for the detection of Cd2+ in real water samples with satisfactory results, demonstrating its potential application for the determination of Cd2+ in the environment.
机译：在本研究中，设计了一种基于双硫zone蚀刻的CdTe纳米粒子的新型荧光探针，用于通过可逆的关闭-开启荧光模式灵敏和选择性地检测环境样品中的镉离子。首先，由于化学刻蚀作用，双硫zone（DZ）的存在可以有效地猝灭 L -半胱氨酸封端的CdTe NPs的初始明亮荧光，这是由于Cd-硫醇的断裂所致。 DZ层的沉积，从而导致NPs表面钝化的减少。然后，由于添加了Cd 2 + ，CdTe NPs-DZ系统的弱荧光逐渐恢复，这归因于表面上存在Cd-硫醇钝化层。的NP。在最佳条件下，Cd 2 + 的线性关系在0.4μM至15.4μM之间，检出限为0.13μM。此外，这种基于CdTe NPs的纳米传感器对Cd 2 + 的选择性比其他金属离子高，并且已成功用于Cd 2的检测+ 在真实水样中的效果令人满意，证明了其在测定环境中Cd 2 + 中的潜在应用。

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