A sensitive localized surface plasmon resonance sensor for determining mercury(II) ion using noble metal nanoparticles as probe

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• 作者：Ning Bi ; Yanhua Chen ; Haibo Qi ; Xia Zheng ; Yang Chen ; Xue Liao ; Hanqi Zhang ; Yuan Tian ; ^{tianyuan@jlu.edu.cn}
• 关键词：Localized surface plasmon resonance (LSPR) ; Mercury(II) ion ; Noble metal nanoparticles (NPs)
• 刊名：Spectrochimica Acta Part A ; Molecular and Biomolecular Spectroscopy
• 出版年：2012
• 期刊代码：99_13861425
• 类别：ch
• 出版时间：September, 2012
• 卷：95
• 期：Complete
• 页码：276-281
• 文件大小：547 K

摘要

The noble metal nanoparticles (NPs), including gold nanorods (AuNRs), gold nanospheres (AuNSs) and silver nanoplates (AgNPTs), were synthesized and Tween 20 stabilized NPs (Tween 20-NPs) were used as the probes for determining Hg²⁺. Hg²⁺ was determined based on the strong affinity between Au (Ag) and Hg. Hg²⁺ was reduced to Hg in the presence of sodium borohydride. Hg interacts with the NPs and the diameter of the NPs decreases with the increase of Hg²⁺ concentration, which causes the shift in absorption peak of Tween 20-NPs. The peak shifts are linearly related to Hg²⁺ concentrations. Compared with AuNSs and AgNPTs, when the AuNRs was used, the sensitivity for determining Hg²⁺ was higher. The developed method shows a good selectivity for Hg²⁺ and can be applied to the determination of Hg²⁺ in water samples.