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Luminescent behavior of cadmium sulfide quantum dots for gallic acid estimation

机译：没食子酸的硫化镉量子点的发光行为

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Thioglycolic acid capped cadmium sulfide (CdS/T) quantum dots have been synthesized using wet chemistry and their optical behavior has been investigated using UV-visible absorption and fluorescence spectroscopy. The role of the capping agent, sulfide source concentration, pH and temperature has been studied and discussed. Studies showed that alkaline pH leads to a decrease in the size of quantum dots and reflux temperature above 70 °C resulted in red-shift of emission spectra which is due to narrowing of the bandgap. Further, to reduce the toxicity and photochemical instability of quantum dots, the quantum dots have been functionalized with polyethylene glycol (PEG), which resulted in a 20% enhancement of the fluorescence intensity. The application potential of CdS/T-PEG quantum dots was further studied using gallic acid as a model compound. The sensing is based on fluorescence quenching of quantum dots in the presence of gallic acid, and this study showed linearity in the range from 1.3 × 10~(-8) to 46.5 × 10~(-8) mM, with a detection limit of 3.6 × 10~(-8) mM.
机译：巯基乙酸封端的硫化镉（CdS / T）量子点已使用湿化学方法合成，并已使用紫外可见吸收和荧光光谱研究了它们的光学行为。已经研究和讨论了封端剂，硫化物源浓度，pH和温度的作用。研究表明，碱性pH导致量子点尺寸减小，回流温度超过70°C导致发射光谱发生红移，这是由于带隙变窄所致。此外，为了减少量子点的毒性和光化学不稳定性，已使用聚乙二醇（PEG）对量子点进行了功能化，从而使荧光强度提高了20％。使用没食子酸作为模型化合物进一步研究了CdS / T-PEG量子点的应用潜力。传感是基于在没食子酸存在下量子点的荧光猝灭，这项研究显示线性范围为1.3×10〜（-8）至46.5×10〜（-8）mM，检测极限为3.6×10〜（-8）毫米

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