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Colorimetric determination of Hg(II) by combining the etching and aggregation effect of cysteine-modified Au-Ag core-shell nanorods
Sensors and Actuators B: Chemical ( IF 8.4 ) Pub Date : 2017-09-19 , DOI: 10.1016/j.snb.2017.09.113
Jian Zhu , Bing-zheng Zhao , Ying Qi , Jian-Jun Li , Xin Li , Jun-Wu Zhao

In this report, a simple and effective approach for colorimetric detection of Hg2+ based on surface etching and aggregation effect of cysteine-modified Au-Ag core-shell nanorods has been investigated. When the addition of Hg2+ has a low concentration under 60 μM, electrostatic interaction-induced intense aggregation of colloidal Au-Ag core-shell nanorods takes place. Thus the longitudinal plasmonic absorption peak decreases rapidly, which also leads to the colloidal color become shallow. Whereas when the addition of Hg2+ has a high concentration greater than 60 μM, the adherent cysteine molecules break away from the surface of nanorods due to the intense Hg-S bond. Then the bare nanorods have been etched under the action of Hg2+. The decrease of the Ag shell results in the red shift of the longitudinal absorption peak, which further leads to the color change of the colloids. The sensing based on particle aggregation-induced absorption decrease has a linear response for Hg2+ from 1 to 60 μM with a theoretical detection limit of 0.273 μM. The sensing based on etching effect-induced red shift has a logarithmic response for Hg2+ from 60 to 250 μM with a theoretical detection limit of 1.065 μM. Interference test and real samples detection results show that Hg2+ could be specifically detected by using this probe based on Au-Ag core-shell nanorods.



中文翻译:

半胱氨酸修饰的Au-Ag核壳纳米棒的刻蚀和聚集作用比色法测定Hg(II)

在此报告中,研究了一种基于表面蚀刻和半胱氨酸修饰的Au-Ag核壳纳米棒的聚集效应的Hg 2+比色检测的简单有效方法。当Hg 2+的添加浓度低于60μM时,会发生静电相互作用诱导胶体Au-Ag核-壳纳米棒的强烈聚集。因此,纵向等离子体吸收峰迅速降低,这也导致胶体颜色变浅。而当Hg 2+的添加浓度大于60μM时,由于强烈的Hg-S键,粘附的半胱氨酸分子会脱离纳米棒的表面。然后在Hg 2+的作用下蚀刻了裸露的纳米棒。。Ag壳的减少导致纵向吸收峰的红移,这进一步导致胶体的颜色变化。基于颗粒聚集引起的吸收降低的感测对Hg 2+的线性响应从1到60μM,理论检测极限为0.273μM。基于蚀刻效应引起的红移的感测对Hg 2+的对数响应为60至250μM,理论检测极限为1.065μM。干扰测试和实际样品检测结果表明,使用基于Au-Ag核壳纳米棒的探针可以特异性检测Hg 2+

更新日期:2017-09-19
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