标题：A colorimetric and surface-enhanced Raman scattering dual-signal sensor for Hg2+ based on Bismuthiol II-capped gold nanoparticles
作者：Duan, Junling ;Yang, Min ;Lai, Yongchao ;Yuan, Jingpeng ;Zhan, Jinhua
作者机构：[Duan, Junling ;Yang, Min ;Lai, Yongchao ;Yuan, Jingpeng ;Zhan, Jinhua ] Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, Dep 更多
来源：Analytica Chimica Acta
摘要：The addition of Bismuthiol II to the gold nanoparticles (AuNPs) solution led to the aggregation of AuNPs with a color change from red to blue. As a result, hot spots were formed and strong surface-enhanced Raman scattering (SERS) signal of Bismuthiol II was observed. However, the Bismuthiol II-induced aggregation of AuNPs could be reversed by Hg2+ in the system, accompanied by a remarkable color change from blue to red. As evidenced by UV-vis and SERS spectroscopy, the variation in absorption band and SERS intensity was strongly dependent on the concentration of Hg2+, suggesting a colorimetric and SERS dual-signal sensor for Hg2+. The sensor had a high sensitivity, low detection limits of 2nM and 30nM could be achieved by UV-vis spectroscopy and by SERS spectroscopy, respectively. Other environmentally relevant metal ions did not interfere with the detection of Hg2+. The method was successfully applied to detect Hg2+ in water samples. It was simple, rapid and cost-effective without any modifying or labeling procedure. © 2012 Elsevier B.V..