Department of Chemistry, School of Physics and Chemistry, Gwangju Institute of Science and Technology (GIST), Gwangju 500-712, Republic of Korea.
Advanced Photonics Research Institute, Gwangju Institute of Science and Technology (GIST), Gwangju 500-712, Republic of Korea.
J Hazard Mater. 2016 Apr 15;307:137-44. doi: 10.1016/j.jhazmat.2015.12.040. Epub 2015 Dec 28.
A simple, receptor-free and regeneratable Hg(2+) sensor, which utilizes localized surface plasmon resonance (LSPR) shifts of a gold nanorod (GNR), has been developed. Precipitation induced by coordination of Hg(2+) to citrate alters the local refractive index (RI) around the GNR surface on glass slide, promoting a red-shift in its LSPR absorption peak. This phenomenon is used to design a sensor that enables quantitative detection of Hg(2+) in the 1nM to 1mM concentration range with good linearity (0.9507 correlation coefficient) and limit of detection (LOD) is reached to 0.38nM. A high selectivity of this sensor for Hg(2+) is demonstrated by the specific LSPR red-shift of 27.67nm promoted by Hg(2+) in comparison to those caused by other metal ions. In addition, the reusability of the new sensor chip is shown by its successful reuse eight-times following successive washing/precipitation steps. Lastly, the sensor displays excellent recoveries in spiking test with real water samples, such as tap water, lake and river. The simple combination of precipitation of Hg(2+)-citrate complex and the LSPR red-shift has led to the design of a novel sensing strategy for Hg(2+) detection.
一种简单、无需受体且可再生的汞（II）离子传感器，利用金纳米棒（GNR）的局域表面等离子体共振（LSPR）位移，已被开发出来。Hg（II）与柠檬酸的配位引起的沉淀会改变玻璃载玻片上 GNR 表面周围的局部折射率（RI），从而导致其 LSPR 吸收峰发生红移。这种现象被用来设计一种传感器，可以在 1nM 到 1mM 的浓度范围内对 Hg（II）进行定量检测，具有良好的线性（0.9507 相关系数）和检测限（LOD），达到 0.38nM。与其他金属离子相比，Hg（II）引起的特异性 LSPR 红移 27.67nm，证明了该传感器对 Hg（II）具有高选择性。此外，新传感器芯片的可重复使用性通过其在连续洗涤/沉淀步骤后的八次成功重复使用得到证明。最后，该传感器在加标测试中对实际水样（如自来水、湖泊和河流）显示出良好的回收率。Hg（II）-柠檬酸配合物的沉淀与 LSPR 红移的简单组合，为 Hg（II）检测设计了一种新颖的传感策略。
