近红外发射的 CdSeTe 合金量子点对 Cu2+ 的超高灵敏检测。
Ultrasensitive Cu2+ sensing by near-infrared-emitting CdSeTe alloyed quantum dots.
机构信息
Key Laboratory of Analytical Chemistry for Life Science (MOE), School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China.
出版信息
Talanta. 2010 Mar 15;80(5):2172-6. doi: 10.1016/j.talanta.2009.11.025. Epub 2009 Nov 13.
The near-infrared (NIR)-emitting CdSeTe alloyed quantum dots (AQdots) that capped with L-cysteine were applied for ultrasensitive Cu(2+) sensing. The sensing approach was based on the fluorescence of the AQdots selectively quenched in the presence of Cu(2+). Experimental results showed a low interference response towards other metal ions. The possible quenching mechanism was discussed on the basis of the binding between L-cysteine and the metal ions. In addition, biomolecules have low effect on the fluorescence due to the minimized interferences in NIR region. The response of the NIR optical sensor was linearly proportional to the concentration of Cu(2+) ranging from 2 x 10(-8) to 2 x 10(-6) mol L(-1). Furthermore, it has been successfully applied to the detection of Cu(2+) in vegetable samples.
近红外发射的 CdSeTe 合金量子点（AQdots）用 L-半胱氨酸进行了封端，可用于超灵敏的 Cu(2+)传感。该传感方法基于在存在 Cu(2+)的情况下，AQdots 的荧光被选择性猝灭。实验结果表明，该方法对其他金属离子的干扰响应较低。根据 L-半胱氨酸与金属离子之间的结合，讨论了可能的猝灭机制。此外，由于在近红外区域干扰最小，生物分子对荧光的影响较低。近红外光学传感器的响应与 Cu(2+)的浓度呈线性比例，范围从 2 x 10(-8)到 2 x 10(-6) mol L(-1)。此外，它已成功应用于蔬菜样品中 Cu(2+)的检测。
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