功能化CdTe荧光纳米传感器对水中有害金属离子的灵敏检测
Functionalized CdTe Fluorescence Nanosensor for the Sensitive Detection of Water Borne Environmentally Hazardous Metal Ions
摘要：
在这项工作中，我们研究了使用COOH功能化的CdTe量子点（量子点）作为荧光纳米传感器的可能性，用于检测水相中的一些环境有害金属离子（$\rm{Cr^{3+}}$，$\rm{Pb^{2+}}$，$\rm{Cu^{2+}}$，$\rm{Zn^{2+}}$和$\rm{Co^{2+}}$）。在水溶液中制备了COOH-CdTe量子点，并通过紫外-可见光谱、光致发光光谱和红外光谱对其进行了表征。CdTe纳米传感器的光学响应被观察到是时间和温度依赖性。在所有金属离子（$\rm{X^{n+}}$）存在下观察到CdTe的强“关闭”荧光响应。Stern Volmer关系式、Job's图和FTIR数据的输出证实了CdTe和金属离子之间存在强的1：1络合（$\rm{X^{n+}: ^{-}OOC-CdTe)}$）。CdTe显示出其对$\rm{Pb^{2+}}$、$\rm{Cr^{3+}}$和$\rm{Cu^{2+}}$离子的有效传感能力，浓度高达$\rm{10^{-14}}$ M，该浓度通过其低检测限（LOD）验证确定。此外，$\frac{F-F_{0}}{F_{0}}$的强烈出现建立了CdTe QD对$\rm{Cr^{3+}}$、$\rm{Pb^{2+}}$、$\rm{Cu^{2+}}$离子的更好的感测能力，其远优于工业中可用的现有荧光传感器。所提出的光学技术和传感的主成分分析被成功地应用于实际样品中溶解的金属离子的测试，如：油漆，河水，雨水等，这验证了COOH功能化的CdTe纳米传感器作为一个有效的成功的光学传感器的适用性，水溶解的金属离子，负责水污染。
英文摘要：
In this work, we have investigated the possibility of using COOH functionalized CdTe quantum dots (QDs) as fluorescent nanosensor for the detection of some environmentally hazardous metal ions ($\rm{Cr^{3+}}$, $\rm{Pb^{2+}}$, $\rm{Cu^{2+}}$, $\rm{Zn^{2+}}$ and $\rm{Co^{2+}}$) in aqueous phase. COOH-CdTe QDs are prepared in aqueous medium and characterized by UV-visible, photo luminescence and FTIR spectrometry. Optical response of CdTe nanosensor is observed to be time and temperature dependent. A strong "Turn-Off" fluorescence response of CdTe is observed in presence of all metals ions ($\rm{X^{n+}}$). The output of Stern volmer relation, graphical Job's plot and FTIR data established the existence of strong 1:1 complexation ($\rm{X^{n+}: ^{-}OOC-CdTe)}$ between CdTe and metal ions. CdTe shows its efficient sensing ability for $\rm{Pb^{2+}}$, $\rm{Cr^{3+}}$ and $\rm{Cu^{2+}}$ ions up to concentration $\rm{10^{-14}}$ M which was established by its low detection of limit (LOD)validation. Further, strong appearance of $\frac{F-F_{0}}{F_{0}}$ establishes the better sensing capability of CdTe QDs for $\rm{Cr^{3+}}$, $\rm{Pb^{2+}}$, $\rm{Cu^{2+}}$ ions which are far better than the existing fluorescent sensors available in industry. The proposed optical techniques and principal component analysis of sensing were successfully applied for testing of dissolved metal ions in real samples like: paint, river water, rain water etc which validates the applicability of COOH functionalized CdTe nanosensor as a effective successful optical sensor for water dissolved metal ions which are responsible for water pollution.
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