Au-Pt-Au nanoraspberry structures used for mercury ion detection

作者：Huang, Jiang-Hao; Huang, Shuai; Wen, Xiaoyan^*; Li, Min; Lu, Haifei

来源：Optical Engineering, 2017, 56(12): 127104.

DOI：10.1117/1.OE.56.12.127104

• Hg2+
• Au-Pt-Au, nanoraspberry
• rhodamine-6G
• localized surface plasmon resonance

Detection of Hg2+ with high sensitivity is of great significance in the biochemical sensing field. Quantitative of Hg2+ was realized based on the influence of Hg2+ on the UV-vis absorption performance of Au-Pt-Au core-shell nanoraspberry (APA)-rhodamine-6G (R6G) structure. First, APA sol was added into R6G indicator solution and the UV-vis absorption signal intensity of R6G was evidently promoted. The signal intensity monotonously increased as more APA sol was added. However, when HgCl2 solution was introduced, the signal intensity declined. A linear relationship between Hg2+ concentration and signal intensity at 527 nm was revealed, based on which quantitative determination of Hg2+ could be realized. Hg2+ detection sensitivity was measured to be 0.031 a.u./M with a limit of detection of 10(-7) M and the response time was 20 s. A high Hg2+ detection selectivity over Cu2+, Na+, Li+, and K+ was demonstrated. Due to its simplicity and high sensitivity, the proposed method could find an extensive application prospect in the Hg2+ detection field.

• 出版日期2017-12
• 单位武汉理工大学