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Synthesis and multifunctional applications of quantum nanobeads for label-free and selective metal chemosensing

机译：量子纳米珠的合成及其在无标记和选择性金属化学传感中的应用

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Due to the importance of quantum dots (QDs), fervent research continues for new preparations, surface modification and investigation of further applications. The facile preparation of CdS QDs embedded in chitosan nanoparticles (CTS) was synthesized, characterized and has been applied for various applications such as hydrogen peroxide (H2O2) and selective detection of metals such as Cu(II) and Mn(II). CdS@ CTS was characterized by TEM, SEM, UV-vis absorption, fluorescence, Fourier transform infrared (FTIR), and Raman spectroscopy. It was found that hydrogen peroxide (H2O2) could directly oxidize CdS QDs and quench the fluorescence emission. The method is non-enzymatic, simple, direct, and sensitive. CdS@ CTS was also applied for metal ion chemosensing such as Mn(II) and Cu(II). Among the different metal, CdS@ CTS showed selectivity toward Cu(II) with a limit of detection of 50 nM and linear range of 30-330 mu M. The detection could take place by the naked eye. Mechanistic studies were refuted using TEM and Raman spectroscopy.
机译：由于量子点（QD）的重要性，对新制备，表面改性和进一步应用的研究一直在进行深入的研究。合成，表征了嵌入壳聚糖纳米颗粒（CTS）中的CdS QD的简便方法，并将其应用于各种应用中，例如过氧化氢（H2O2）和金属如Cu（II）和Mn（II）的选择性检测。 CdS @ CTS通过TEM，SEM，UV-vis吸收，荧光，傅里叶变换红外（FTIR）和拉曼光谱进行了表征。发现过氧化氢（H2O2）可以直接氧化CdS QDs并猝灭荧光发射。该方法是非酶促的，简单的，直接的和灵敏的。 CdS @ CTS还用于金属离子化学传感，例如Mn（II）和Cu（II）。在不同的金属中，CdS @ CTS对Cu（II）表现出选择性，检测限为50 nM，线性范围为30-330μM。检测可用肉眼进行。使用TEM和拉曼光谱对机理研究进行了驳斥。

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